80 results about "Pre straining" patented technology

The present invention relates to electroactive polymers that are pre-strained to improve conversion from electrical to mechanical energy. When a voltage is applied to electrodes contacting a pre-strained polymer, the polymer deflects. This deflection may be used to do mechanical work. The pre-strain improves the mechanical response of an electroactive polymer. The present invention also relates to actuators including an electroactive polymer and mechanical coupling to convert deflection of the polymer into mechanical work. The present invention further relates to compliant electrodes that conform to the shape of a polymer. The present invention provides methods for fabricating electromechanical devices including one or more electroactive polymers.

A composite structure (3) includes a piezoelectric element (1) sandwiched between fiber composite panels (2). The composite structure can be used as an actuator element. In a method for producing the composite structure, the fiber composite panels are pre-stressed and pre-strained by applying respective pre-stressing forces (F1, F2) in opposite directions along two substantially perpendicular axes in the plane of the panel. The pre-stressed and pre-strained condition of the fiber composite panels (2) is maintained, while the panels are adhesively bonded (5) surfacially onto the piezoelectric element (1). After the bonding is completed, the pre-stressing forces are removed from the fiber composite panels. As a result, in the finished composite structure (3), the fiber composite panels (2) are under internal tension, while the piezoelectric element (1) is under internal compression. The pre-stressing forces (F1, F2) are particularly selected in magnitude and direction to achieve the required resultant balance of tension and compression within the composite structure (3). The pre-compression of the piezoelectric element (1) should be sufficient so that operating loads on the composite structure do not result in tension loading of the piezoceramic element, while substantially maintaining the useful active strain range of the overall composite structure.

The invention belongs to the technical field of flexible device manufacturing, and relates to a method for manufacturing a flexible stretchable device based on an ordered arrangement torsion structure. The method includes the steps that firstly, a flexible macromolecule substrate is pre-stretched to be fixed to a glass sheet, and electrodes are manufactured at the four edges of the pre-stretched flexible macromolecule substrate; secondly, the flexible macromolecule substrate is placed on an annular metal collector connected with the negative electrode of a power source to serve as a collecting substrate, and a machined hollow stainless steel needle serves as a spinning spraying head; a spinning solution is injected into a spinning solution container for electrospinning; the flexible macromolecule substrate is horizontally rotated by 90 degrees for continuous electrospinning and then taken down from the glass sheet, and the flexible stretchable device based on an ordered arrangement torsion structure is obtained. The method is simple in manufacturing process and convenient to operate; the manufactured flexible stretchable device can be stressed and tensioned in one or two of the two-dimensional directions respectively, pre-strain control over materials in the two directions can be accurately achieved, and the application range is wide.

Devices, kits and methods described herein may include a dressing that is pre-strained and stored for a period of time after which the dressing is applied to the skin of a subject.

The invention discloses a titanium alloy thin-wall part hot-stretch creep deformation composite molding method. The titanium alloy thin-wall part hot-stretch creep deformation composite molding method comprises eight steps that 1, equipment and raw materials are prepared; 2, electrode splints are electrified and a blank material needing to be molded is heated; 3, real-time measure of a temperature of the blank material needing to be molded is carried out and output voltage of a power supply is adjusted in real time to realize a blank material heating rate of 5 to 25 DEG C per second; 4, when a temperature of the blank material needing to be molded is in a range of 600 to 750 DEG C, jaws of a stretch molding device clamp the blank material needing to be molded and the blank material needing to be molded is subjected to pre-stretch at a preset strain rate; 5, when a pre-strain ratio is in a range of 0.1 to 4%, the molded blank material is subjected to coating at a temperature of 600 to 750 DEG C and a preset strain rate until the molded blank material is completely fitted to a mold; 6, the molded blank material treated by the step 5 is subjected to stretch supplement at a temperature of 600 to 750 DEG C and a preset strain rate until an end strain ratio is in a range of 0.1 to 8%; 7, the molded blank material treated by the step 6 is subjected to heat preservation for a period of time so that stress relaxation in the molded blank material occurs and creep deformation molding is realized; and 8, the powder supply is cut off and the molded blank material treated by the step 7 is cooled and is taken down.

The invention provides a pre-deformation method capable of endowing a cement pavement calking material with a shape memory function, belongs to the technical field of cement pavement calking material preparation, and solves the problems of one-way shape memory function endowing , poor self-healing effect, complex temperature control requirement, high cost, limited preparation amount, poor durability and the like in the current pre-deformation method for the cement pavement calking material. The pre-deformation method comprises the following steps: stretching and deforming a calking material vertically to a design strain value at the temperature which is higher than a calking material glass transition temperature, and freezing a pre-stretching strain; applying compressive stress at a constant speed to a test piece in a vertical stretching direction at a normal temperature to enable the test piece to reach a preset compressive strain level, fixing the pre-compressive strain value, and endowing the calking material with the shape memory function in a two-dimensional direction; measuring the shape memory effect and other pavement performance of the calking material, and preferably selecting a group of reasonable stretching and compressive pre-strain value combination. According to the method provided by the invention, the difficulty in two-dimensional pre-deformation is reduced, so that the calking material has a better shape memory effect, and the durability of the calking material and a cement pavement are improved.

The invention provides a flexible lead, a preparation method of a flexible electronic device and a flexible wireless energy supply device. The method comprises steps that a base material formed through combining a rigid substrate, a sacrificial layer and a functional film is provided; a femtosecond laser is utilized to cut the functional film of the base material such that the functional film is formed with a planar wire structure; the sacrificial layer is removed, and the planar wire structure is separated from the rigid substrate; a two-dimensional flexible wire is formed on the planar wirestructure; or the planar wire structure is assembled to a pre-stretched flexible substrate, pre-strain of the flexible substrate is released, and the planar wire structure is bent to form a three-dimensional flexible wire . The method is advantaged in that the flexible wire with high precision, large scale and no pattern limitation can be prepared, unique advantages of fast property, environmentalprotection, low cost, high resource utilization rate and insensitivity to the external environment can be further realized, and the method is suitable for preparing 2D and 3D flexible wires.

A stretch laminate is disclosed. The stretch laminate may include a first layer; a second layer; and one or more elastic members disposed between the first layer and the second layer. The first layer may include a nonwoven web material bearing a pattern of thermal bonds, including a plurality of bonds each having a length and a width, the length being oriented perpendicularly to the stretch direction and being greater than the width, for a majority of the bonds. The elastic member(s) may be joined with the first layer and the second layer while pre-strained in the stretch direction; when the stretch laminate is in a relaxed condition, at least the first layer may include a plurality of gathers comprising elongate ridges and valleys oriented transversely to the stretch direction. A disposable absorbent pant having an elasticized belt structure including the stretch laminate, is also disclosed.

The invention provides a thermo-mechanical processing method for eutectic high-entropy alloy. The method comprises the following steps that S1, rolling and recrystallization treatment is carried out multiple times; and S2, pre-strain and aging treatment is carried out; namely, the eutectic alloy is subjected to the rolling and recrystallization treatment many times, and then is subjected to the pre-strain and aging treatment to obtain the eutectic alloy subjected to thermo-mechanical processing. According to the method, mechanical treatment and multiple heat treatment processes are applied tothe eutectic alloy, interface strengthening, dislocations strengthening and precipitation strengthening are used in combination to obtain the ultrahigh-strength eutectic alloy, and the method has a wide industrial application prospect.

The invention discloses a medical expense big data analysis method, device and equipment and a computer readable storage medium. The method comprises the steps that a data request inputted from the outside is received, and the medical expense data corresponding to the data request are called from a database, wherein the database is obtained by integration of multiple distributed heterogeneous medical expense data sources; data mining is performed on the medical expense data corresponding to the data request by using the pre-strained data mining algorithm so as to obtain the data mining resultcorresponding to the data request; and the data mining result is outputted. According to the technical scheme, multiple distributed heterogeneous data sources are integrated in the unified database sothat unified analysis and management of the data can be facilitated; and the data useful for the user can be effectively acquired from the massive medical expense data and thus the method has great advantages in medical expense big data processing.

A replaceable energy dissipation wood structure beam-column joint comprises a beam column connecting piece, a steel plate frame, a plurality of embedded steel bars and a plurality of shape memory alloy screws. The beam column connecting piece is arranged on the inner side face of a wood column and located between the wood column and the connecting end of a wood beam. The steel plate frame is arranged at the end of the wood beam and attached to the upper face, the lower face, the front face and the rear face of the end face of the wood beam; the embedded steel bars are respectively embedded inhole channels or groove channels in the end surface of the wood beam through adhesive; and the shape memory alloy screws are positioned between the embedded steel bars and the beam column connecting piece. According to the invention, the pre-tightening force of high-strength bolts are adjusted, the hyperelastic performance of the shape memory alloy screws is utilized, the pre-strain, number and size of the shape memory alloy screws are adjusted, the initial rigidity and self-recovery capacity of joints are improved, it is guaranteed that the shape memory alloy screws are subjected to yield damage before beam column components, so that the maintenance and repair costs of the wood structure are greatly reduced.

The invention discloses a pre-strain rib total deformation measuring method in a pre-strain reinforcement test. A calculation formula of the pre-strain rib total deformation epsilon i is Epsilon i=Delta Epsilon'i+Delta Epsilon ci+Delta Epsilon'ri, wherein the Delta Epsilon'i is initial pre-strain of a pre-strain rib, the Delta Epsilon ci is additional strain of the pre-strain rib due to soil body compression, and the Delta Epsilon'ri is rib creep rate. The actual engineering conditions are considered in the formula, the pre-strain rib total deformation can be accurately and reliably estimated, initial deformation degree of the rib during rib tensioning is ensured, overlarge additional rib deformation caused by settlement deformation of an embankment is avoided, accordingly fracture failure caused by the fact that the total rib deformation exceeds allowable strain is prevented effectively, and environmental geological disasters including high and steep slope slippage and the like can be scientifically prevented and decreased.

The invention provides a thermomechanical treatment method of eutectic high-entropy alloys. The thermomechanical treatment method includes the following steps that S1, multiple times of rolling and recrystallization processing are conducted; S2, pre-straining and aging treatment are conducted; and in other words, multiple times of rolling and recrystallization processing are conducted on the eutectic alloys, then pre-straining and aging treatment are conducted, and the eutectic alloys subjected to thermomechanical treatment are obtained. According to the thermomechanical treatment method, by using mechanical treatment and multiple thermal treatment processes for the eutectic alloys, interface reinforcement, dislocation strengthening and precipitation strengthening are combined, the ultrahigh-strength eutectic alloys are obtained, and wide industrial application prospects are achieved.