251 results about "Strength reduction" patented technology

The invention discloses a high-strength high-conductive copper alloy, which comprises 0.04~0.16 Ag, 0.02~0.4% Zr and copper. The opposite method comprises: melting alloy; solidifying alloy; deformation treating and failure treating. This invention overcomes the conflicting problem for high-strength and high-conductive. The product prolongs service life 3~5 times, has strength 500~600MPa, conductivity more than 80%IACS, softening temperature more than 400Deg, strength reduction rate less than 10% and extension rate more than 5% at 300Deg, and fit to all request for copper alloy.

A method, system, and computer readable medium for converting a series of computer executable instructions in control flow graph form into an intermediate representation, of a type similar to Static Single Assignment (SSA), used in the compiler arts. The indeterminate representation may facilitate compilation optimizations such as constant propagation, sparse conditional constant propagation, dead code elimination, global value numbering, partial redundancy elimination, strength reduction, and register allocation. The method, system, and computer readable medium are capable of operating on the control flow graph to construct an SSA representation in parallel, thus exploiting recent advances in multi-core processing and massively parallel computing systems. Other embodiments may be employed, and other embodiments are described and claimed.

A degradable copolymer filament comprising an internal structure having the following separate phases: (a) a matrix phase comprised as a primary component of a polymer segment which exhibits a tensile Young's modulus of 2 GPa or less and a strength retention of 50% or more after two weeks in water at 37 DEG C., pH 7.3, and (b) a micro-dispersed phase comprised as a primary component of a polymer segment which exhibits a tensile strength of 200 MPa or more and a strength reduction greater than the matrix phase in water at 37 DEG C., pH 7.3. The weight ratio of each component in the matrix phase and dispersed phase is 50:50 to 95:5, respectively, and the dispersed phase a needle structure oriented by stretching in the fiber direction. A degradable monofilament having an excellent mechanical strength and flexibility, moderate hydrolyzability, high ligature stability and being suitable as a material of surgical absorbable suture can be obtained. A preparation process is also provided.

The invention discloses a method for calculating the slope stability safety coefficient based on strength reduction of a humidifying condition. The method comprises the steps of testing the dry density rhod, the natural moisture content omega1, and the percentage of saturated moisture content omega2 of a slope soil body sample, testing the cohesive force c and internal friction angles of samples with different moisture contents, and calculating the volume weight gamma of the samples, wherein the formula of internal friction angles is shown in the description; drawing the relation curves of the cohesive force c and the internal friction angles respectively with the moisture content omega, and obtaining a mathematic formula of a fitting relation curve; adopting a dichotomy approximation method and considering the volume weight change, and calculating the moisture content omegaF when the slope is in critical failure; calculating the slope stability safety coefficient F. According to the method for calculating the slope stability safety coefficient based on the strength reduction of the humidifying condition, anti-shearing strength of the slope soil body is reduced based on the humidifying condition, the method better conforms to the engineering practice that the moisture content of the soil body is increased, and thus the strength is lowered due to rainfall infiltration or irrigation or the like, and the shortcoming that a prior strength reduction method is not clear in mechanical concept is overcome. When strength reduction is conducted, the adverse influence of the increase of the volume weight of the soil body on the slope stability is further considered. Therefore, the method for calculating the slope stability safety coefficient based on the strength reduction of the humidifying condition is more scientific and safer.

Inter-procedural strength reduction is provided by a mechanism of the present invention to improve data cache performance. During a forward pass, the present invention collects information of global variables and analyzes the usage pattern of global objects to select candidate computations for optimization. During a backward pass, the present invention remaps global objects into smaller size new global objects and generates more cache efficient code by replacing candidate computations with indirect or indexed reference of smaller global objects and inserting store operations to the new global objects for each computation that references the candidate global objects.

The invention relates to a seafloor instability evaluation method. The method comprises: firstly, selecting out critical geological factors influencing seafloor slope stability according to geological environment conditions of seafloor slope occurrence and basic conditions of seafloor slope instability; secondly, selecting out critical induction factors influencing seafloor slope stability through a decomposition mode and a decomposition effect of natural gas hydrates, and constructing a seafloor slope stability influence factor index system; thirdly, constructing a seafloor slope geomechanics model by generalizing the seafloor slope stability influence factor index system; and finally, based on a Mohr-Coulomb failure criterion, proposing a mathematic method for evaluating seafloor slope stability, i.e., an improved finite element strength reduction method, and analyzing an evolutional process of seafloor slope stability and seafloor slope instability induced by decomposition of natural gas hydrates. The method is scientific in principle, high in calculation precision and short in calculation time, considers the induction factors of seafloor slope instability caused by decomposition of natural gas hydrates for the first time, gives out a deformation process of slope instability in combination with the geomechanics model and the finite element numerical analysis method, and has important practical application values.

The invention discloses a dynamic change original position observation system for a seabed interfacial layer. The dynamic change original position observation system comprises a seabed interfacial layer observation platform, an oscillating type detection rod penetrating apparatus and a multiparameter observation detection rod, wherein the seabed interfacial layer observation platform is used for loading various observation apparatuses and the oscillating type detection rod penetrating apparatus and is in riveted connection with the detection rod penetrating apparatus, the probe of an anti-sinking plate and a through hole are designed to form the laying stability and recovery convenience of an entire observation system, and the oscillating type detection rod penetrating apparatus uses a vibration exciter to generate vertical power to allow the observation detection rod to continuously insert in seabed deposit. New design principle and means are employed, partial liquefaction and strength reduction of seabed deposit can be realized through high frequency vibration, so that the observation detection rod can continuously insert in the seabed deposit, and the implementation is more convenient. The multiparameter observation detection rod is connected with the vibration exciter, and integrated with various sensors to realize synchronous observation of three-phase media of sea water body-seabed interface-seabed deposit. A water inlet fine pipe is provided and a water inlet when opened during recovery can eliminate vacuum suction on the bottom of the detection rod to facilitate recovery. The observation system provides essential technology support for researching dynamic evolution of the seabed interfacial layer.

The invention relates to the technical field of civil engineering construction, in particular to a construction method of an ultra-deep underground diaphragm wall in a water-rich soft-soil area. The construction method comprises the following steps: making an analysis and research on the stability of trench walls of the underground diaphragm wall and doing relevant preparations, preparing wall protecting slurry, building a guide wall, performing trenching construction, wall cleaning and sediment removal, manufacturing and hoisting reinforcing cages, backfilling joints between trench sections, and pouring wall concrete. According to the construction method, through a stability analysis method that introduces strength reduction, the security coefficients of stability of the trench walls are calculated based on a finite difference method; through parameter-reduction circular calculations, not only the limit stress and large deformation state of the trench walls but also the stability coefficients of the trench walls are obtained, which has practice guiding significance in construction; and the results are simple and practical and conform to the habits in the engineering field, and the stability requirements of the trench walls are effectively guaranteed, so that the engineering construction can be completed safely and fast with high quality.

The invention provides a water-soluble salt core type metal powder injection molding technology and relates to the technical field of metal powder injection molding. The technology comprises the steps of mixing, water-soluble salt core preparing, mold core inlaying and mold clamping, injection molding, core-removing drying, degreasing and sintering. According to the technology, a fused and poured water-soluble salt core forms a part cavity and can be dissolved and removed through clean tap water at indoor temperature, the removal time is short, the safety is high, the environmental friendliness is high, and the potential problems of production insecurity, environmental pollution and strength reduction of green bodies caused by polymer core removal can be effectively solved. Part products manufactured through the technology are uniform in internal structure, high in compactness, high in surface smoothness, high in dimensional precision and stable in quality, a great deal of time and cost are saved for volume production of small and precision parts provided with closed or complicated cavity structures and made of various metal materials, the economic benefit is good, and the application prospect is good.

The invention discloses a drilling power tool, a drilling tool and a drilling method for forming boreholes. The drilling power tool comprises an energy conversion mechanism and a valve shaft system. The energy conversion mechanism is a rotary generator. The valve shaft system comprises a stator, a rotor, a movable valve sheet assembly, a fixed valve sheet assembly and a shaft assembly, wherein the rotor makes a reciprocating motion right and left and drives the movable valve sheet assembly directly connected with the rotor. The energy conversion mechanism is a screw rod or a turbine or an impeller. According to the invention, when a drilling bit is rotated, the drilling pressure at the drilling bit and the drilling pressure at the bottom of a drilling well are similar to the continuous gentle change of the sine law, which is favorable for the strength reduction of surrounding rocks and the development of fractures, so that the rock breaking efficiency can be improved obviously. In addition, because the pressure at the drilling bit and at the bottom of the drilling well is changed periodically, the negative-pressure injection and the high-pressure injection are generated alternately; and when the pressure becomes lower, the well drilling in an underbalance manner or by using the gas drilling fluid is carried out, so that the surrounding rock environment is changed, and the mechanical drilling rate is improved obviously.

The invention relates to a crease-resistant finishing method for point-like crosslinked fabric based on a spraying method. Precisely-controllable spraying equipment is utilized to uniformly spray a crease-resistant finishing agent on the fabric at a certain dimension and at a certain interval, uniform dense uncontinuous crosslinked points are formed in the fabric after thermal processing and / or electron-beam irradiation are / is performed, so that the point-like crosslinking structure is formed. The crosslinking points fix molecular chains, prevent large slippage of the molecular chains and provide crease resistance for the fabric. Certain relative movable capability is provided between the molecular chain segments among crosslinking points and fiber, so that the fabric is endowed with softness and high tensile-strength retention rate, and the tensile-strength reduction phenomenon easily caused by routine fabric crease-resistant finishing method is prevented. The provided method has the advantages of being simple in operation, high in processing efficiency, green and environment-friendly, and high in economic benefit. The prepared product is good in crease resistance, soft in handfeeling, free of obvious reduction on tensile strength and good in tensile-strength retention rate, and is applicable to clothes, bedding articles and the like.

The invention discloses a design method of embedded type anti-slide piles and relates to the field of landslide control. The design method comprises the steps as follows: firstly, acquiring landslide system parameters; then, setting I groups of embedded type anti-slide piles with different pile parameters, and establishing a landslide system finite element model according to a Mohr-coulomb matching D-P criterion under a plane strain condition; finally, solving strength reduction safety coefficient Si of each group of anti-slide piles, and selecting pile parameters of the anti-slide piles closest the safety coefficient threshold STH as pile parameter solution values. Landslide systems with different pile parameters are established, the strength reduction safety coefficients of the landslide system with pile parameters are solved by the aid of landslide system finite element model, and the anti-slide piles closest to the safety coefficients are selected. With the adoption of the design method, the pile-soil combined action is fully considered, failure modes and safety coefficients after setting of the anti-slide piles are obtained through strength reduction calculation, the advantages of the embedded type anti-slide piles are truly played, the design method is safe, and the overtopping phenomenon is avoided.

The invention discloses a method for determining tunnel limit displacement. The method comprises the steps of establishing a finite element numerical model; determining main mechanical parameters of the surrounding rock; wherein the tunnel site region ground stress adopts a self-weight ground stress field; determining a key monitoring point; simulating an excavation and support process; checking model rationality; dividing the surrounding rock strength by the reduction coefficient, and simulating an excavation and support process; if the calculation does not meet the stop condition, returningto the previous step and increasing the reduction coefficient until the stop condition is met; extracting the key point displacement of the previous reduction step reaching the stop condition; and theobtained key point displacement is multiplied by a measurable coefficient to serve as tunnel limit displacement for monitoring, measuring and early warning. The limit state and the limit displacementof the tunnel surrounding rock are obtained through surrounding rock strength reduction, operation is easy, reliability is achieved, cost is low, the influence of factors such as the tunnel section type, the buried depth, the construction procedure and the supporting structure on the tunnel limit displacement can be considered, and necessary technical support is provided for researching the tunnel limit displacement and establishing a monitoring and measuring early warning standard.

The invention discloses a slop instability mechanism judgement method, wherein according to the three-dimensional numerical model of the slope, based on the strength reduction method and the slope progressive failure theory, dividing arbitrary points of the slope into four stages of stability, basic stability, under-stability and instability according to the slope failure theory and the slope macroscopic deformation characteristics; and the slope instability mechanism is obtained by comparing and analyzing the evolution characteristics of the stability of each segment of the sliding body underdifferent reduction factor conditions. The method can be used for scientific analysis of landslide hazards and provide a theoretical basis for slope reinforcement.

Inter-procedural strength reduction is provided by a mechanism of the present invention to optimize software program. During a forward pass, the present invention collects information of global variables and analyzes the information to select candidate computations for optimization. During a backward pass, the present invention replaces costly computations with less costly or weaker computations using pre-computed values and inserts store operations of new global variables to pre-compute the costly computations at definition points of the global variables used in the costly computations.

The invention belongs to the field of surface treatment of metals, and in particular relates to surface pretreatment solution and a pretreatment method used for bonding magnesium alloys. The surface pretreatment solution comprises the following components: 10 to 50 g / L dihydric phosphate, 1 to 5 g / L compound accelerant, and 0.5 to 3.0 g / L sodium fluoride, wherein the compound accelerant is formed by mixing molybdate, tungstate and nitrate. A phosphide film obtained by the pretreatment solution and the pretreatment method of the invention has the characteristics of completeness, uniformity and compactness, so a bonded joint has high shearing strength and very high corrosion resistance in a corrosion environment; and a phenomenon of the strength reduction of the joint is lightened. In addition, the environmental pollution caused by heavy metal ions such as hexavalent chrome in the pretreatment solution is eliminated, so the method is an environmental-friendly surface pretreatment method for bonding the magnesium alloys.

The invention discloses a super-large-cross-section tunnel-based surrounding rock classification method. The super-large-cross-section tunnel-based surrounding rock classification method comprises the following steps of (1) obtaining a tunnel excavation section area S; (2) calculating and determining the number of excavation faces according to a formula S / 50, and ensuring the excavation faces to be same in area, wherein S is the tunnel excavation section area in the step (1); (3) performing finite element numerical simulation analysis on practical engineering, and performing strength reduction on the excavation faces and expanded regions of the excavation faces to obtain different safety coefficients a1, a2, a3 and a4; (4) determining weight values b1, b2, b3 and b4 according to the reciprocals of the different safety coefficients a1, a2, a3 and a4 in the step (3); (5) performing zoning on the excavation faces on site; (6) calculating [BQ] of zones, and performing weighting according to [BQ] so as to obtain [BQ]A; and (7) finishing excavation face sketches according to an actual situation, and marking [BQ] and [BQ]A of the zones.

The invention discloses a side wall structure for a hopper car. The side wall structure comprises an integrally formed upper side beam (1), an integrated side wall plate (2), an integrally formed lower side beam (3) and a lower side wall (4). The upper side beam (1) and the integrated side wall plate (2) below are riveted. The side wall plate (2) and the integrally formed lower side beam (3) below are riveted. The side wall plate is in a wall plate and side column integrated plate-column structure, and the side columns are arranged on the inner side of the car body. The lower side beam (3) and the lower side wall (4) below are riveted. According to the side wall structure, by means of the integrated side wall plate with the built-in side columns, both the strength reduction due to rivet holes and the increased weight and cost due to the usage of rivets are prevented, the side columns are arranged inside, so that space among the side columns is used, and the car body volume is increased.

The invention provides a failure criterion for a homogeneous slope stability strength reduction method. The failure criterion is characterized in that a slope is judged as under an ultimate balancing state through a continuous strength reduction parameter, namely, cohesive force c and frictional angle tangent value, when a slope curve and a slope planer line under the ultimate state calculated according to a sliding line field theory are intersected at a slope toe; and meanwhile, the reduction coefficient is a safety coefficient, and then the reduced strength parameter and the slope geometric and boundary conditions are substituted into a finite difference method and a critical slip surface is confirmed through the calculated maximal plastic strain cut-through zone. The failure criterion provides a new analysis method for evaluating the slope stability and has the advantages of being scientific and reasonable, high in practical value in engineering and excellent in effect.

The invention relates to a method for calculating the stability safety factor of a concrete gravity dam under a multi-dam-section combined skid resistance condition and belongs to the field of gravity dam stability analysis. According to the method, a three-dimensional stability analysis calculation model is established on the basis of a three-dimensional rigid body limit balance analysis and strength reduction method by aiming at a situation that key slots are formed or grouting is performed between dam sections of the concrete gravity dam so as to combine slide resistance; by introducing a plurality of reasonable assumption and unbalanced force transfer concepts, the statically indeterminate problem of combined anti-sliding stability of multiple dam sections along a dam foundation surface is converted into a statically determinate problem; on the basis of solving out the independent anti-sliding safety factor of the dam sections, the transfer of unbalanced forces of adjacent dam sections on a river valley side is considered, circulation calculation is performed, and the overall stability safety factor of combined slide resistance of multiple dam sections, the sequence of sequentially achieving limit balance by each dam section and the local stability safety factor of the dam sections are solved out. The method has the characteristics of easiness for realization of programming, reasonable calculation result and the like, and is convenient in popularization and application in practical engineering.

The invention discloses a finite element stability calculation method for a filling slope of a composite foundation. The method comprises the following steps that firstly, rock-soil physical and mechanical parameters of all materials are determined through a field test or an indoor test; 2, determining the arrangement form, the arrangement interval and the pile body diameter of the pile body; and3, calculating the cohesion Cc of the composite foundation, the internal friction angle phic of the composite foundation, the elasticity modulus Ec of the composite foundation and the volume weight gammac of the composite foundation within the pile body arrangement range according to the following formula; 4, establishing a filling slope finite element model with a composite foundation, calculating soil parameters of a composite foundation area through the calculation result in the step 3, and calculating the slope stability safety factor FOS through a strength reduction method. Compared withthe prior art, the method has the advantages that compared with a finite element model for establishing a complete pile body, the calculation precision of the method does not exceed 3%; 2, the calculation time of the method only needs to establish 1 / 10-1 / 8 of the finite element model calculation time of the complete pile body;

The invention discloses a preparation method of a diamond coated cutting tool. The preparation method comprises the following steps: (1) corroding a cutting tool base body; (2) depositing a Cr / CrN transition layer; and (3) depositing a diamond coating. With adoption of the preparation method, the binding force between the diamond coating and a hard alloy base is effectively improved, Co diffusion is also restrained, and nucleation and growth of the diamond coating are facilitated to form the diamond coating with high adhesive force; after depositing the diamond coating, contents of Co on the surface layer and the interior of the hard alloy are basically kept consistent, so that Co deficiency on the surface layer does not cause strength reduction of the cutting tool, and the Cr / CrN transition layer facilitates keeping of keenness of the cutting edge of the cutting tool.

The invention belongs to the field of oilfield chemistry related to the enhanced oil recovery technique, and particularly relates to intercalation delay in-situ polymerization water shutoff gel for a high-temperature oil reservoir. The intercalation delay in-situ polymerization water shutoff gel is prepared from, by mass, 6-8% of host agent, 1-2% of cross-linking agent, 2-8% of intercalation host agent, 0.06-0.1% of initiator, 0.01-2% of gelling regulating agent, and the balance water. The intercalation delay in-situ polymerization water shutoff gel has the advantages that the fast dissolving property of components in the gel system is good, and liquid dosing is convenient; the construction technology is simple, pumpability is high, and injectivity is high; gelling time can be controlled to be 4-30 h at 130 DEG C; long-term stability is high at high temperatures, and synaeresis and strength reduction does not occur on the gel within three months; influence on gelling performance is small, leak-off prevention can be well achieved, and the gel can be used for water shutoff of fractured reservoirs.

The invention belongs to the technical field of axial compressors, and relates to an aerodynamic design method of a subsonic adsorption type axial compressor, in order to solve the problems of increasing of blade rotating angles of a subsonic axial compressor and boundary layer separated in a moving blade during stage load increasing as well as the problems of suction pipeline layout difficulty, blade strength reduction and the like caused by boundary layer suction in the moving blade. On the premise of unchanging an inlet velocity triangle, with design stage load coefficient increasing gradually and exceeding a conventional design value, outlet axial velocity of the moving blade is increased greatly so as to reduce diffusion factors in the moving blade, so that efficient flow of the moving blade is guaranteed; and boundary layer suction is utilized for achieving internal flow of a fixed blade. As boundary layer suction is performed in the moving blade as well as the fixed blade, problems of poor blade strength of a rotatable part and difficulty in suction structure design are solved effectively; and as compared with a tandem cascade technique, the aerodynamic design method has the advantages that blades can be decreased, and accordingly size and weight of an engine are reduced. The method can be applied to aerodynamic design of aero-engines with high thrust-weight ratio.

The present invention provides a sagger which is used for sintering powder of lithium compound and realizing corrosion resistance improvement for lithium diffusion through containing a magnesium oxide component. Simultaneously, thermal expansion coefficient increase of the sagger can be restrained through containing the magnesium oxide component, thereby effectively preventing a thermal shock performance reduction problem and a product strength reduction problem which are caused by the thermal expansion coefficient increase. The sagger which is used for sintering the powder of the lithium compound according to the invention comprises spinel with grain diameter that is smaller than 1 mm and periclase with grain diameter that is smaller than 0.5 mm. The composition ratio of the crystal phase is as follows: cordierite: periclase: spinel: corundum: mullite=1:(0.1-0.7):(0.03-0.4):(0.01-0.15):(0.06-1.10).

The invention belongs to the technical field of the processing of seamless steel tubes and provides a forming and fabrication method of an ultra-high strength steel seamless high pressure gas cylinder. The forming and fabrication method of the ultra-high strength steel seamless high pressure gas cylinder specifically comprises the following steps of 1) heating the nosing sections of a seamless steel tube for processing the large-volume steel seamless high pressure gas cylinder to a temperature of 1000-1200 DEG C; performing hemispheric nosing and spinning on the nosing sections of the seamless steel tube for 8-10 times to obtain hemispheric cylinder shoulders; 3) obtaining the cylinder lip by performing cylinder lip spinning forming on the seamless steel tube for 3-4 times; 4) finishing and spinning the surface. According to the forming and fabrication method of the ultra-high strength steel seamless high pressure gas cylinder, ultra-high strength steel with the yield strength larger than 980 MPa can be used for fabricating the seamless high pressure air cylinder of 40 MPa level; shortcomings such as incontinuity, strength reduction, brittle fracture and tensile stress concentration and the like due to welding seams of a welded air cylinder produced through a traditional method can be prevented, and the gas tightness and pressure-resistant performance of the air cylinder can be greatly improved.

The invention discloses a landslide deformation prediction computing method. The method comprises the steps that 1 a full strain stress test and a creep test are carried out, and the equal deformationafter a rock and soil body exceeds a peak point is used as a reference to establish relation between a full stress strain test curve and a creep test curve to acquire the curve of mechanical parameters of the rock and soil body, wherein the curve changes with time; 2 the tested mechanical parameters of the rock and soil body are used to acquire the curve of the landslide deformation of differentrock and soil body mechanical parameters through a finite element strength reduction method, wherein the curve changes with time; and 3 a slope finite element computing model in a stress state predicts the landslide deformation value at the parameter according to the soil body mechanical parameter at the time of landslide. The method provided by the invention has the advantages that the rock and soil full stress strain test, the creep test and the finite element strength reduction method are combined to compute and analyze the landslide deformation; the computing is accurate; only full stressstrain and creep tests are needed; establishing a new constitutive model is not needed; and the method has the characteristics of clear mechanism, small spending cycle and good economic effect.

The invention discloses an improved double strength reduction method of slope stability evaluation. The method has the following steps: analyzing the mapping relationship between the double reduction factor rate and the safety factor, combining the calculation of the examples, fitting the mapping relational expression, giving the concept of minimum safety factor, and finally providing the improved double strength reduction method and general steps for analyzing the slope stability through the method to provide new analytic method to the slope stability evaluation.

The invention discloses a variable density high-speed aircraft flap rudder. Pore structures associated with a topological optimization result are arranged on a longitudinal wall and a transverse wall, and hollow microstructures are arranged on flap rudder skin in an array, so that failures caused by too much high-temperature strength reduction of a rudder spindle due to the fact that a large quantity of heat is transferred to a rudder spindle through an aerothermal load can be effectively solved, and meanwhile more than 15% of weight reduction can be realized qualitatively compared with a traditional flap rudder structure.