31 results about "Interfacial fracture" patented technology

Dielectric composite structures comprising interfaces possessing nanometer scale corrugated interfaces in interconnect stack provide enhances adhesion strength and interfacial fracture toughness. Composite structures further comprising corrugated adhesion promoter layers to further increase intrinsic interfacial adhesion are also described. Methods to form the nanometer scale corrugated interfaces for enabling these structures using self assembling polymer systems and pattern transfer process are also described.

A device is designed to remove blockages in a lumen such as a thrombus, blood clot, or embolus. The device comprises a manipulating wire and a structure that can conduct electrical current to a lumenblockage. The electrical current is preferably in radio frequency (RF). The RF electric current in the blockage can excite the contents such as proteins of the blockage, so that cross-linking densityand interfacial adsorption of the entire blockage is enhanced. The enhanced cross-linking density can result in increased fracture resistance of the blockage such that fracture of the blockage duringthe removal process is unlikely. The enhanced interfacial adsorption results in increased interfacial fracture resistance between the device and blockage so that the blockage can be securely capturedduring the removal process without using radially applied force.

The invention discloses a method for obtaining the I-mode fracture toughness of the interface of a three-dimensional woven composite material. The steps of the method are as follows: 1. Observing the arrangement structure of the yarns of the three-dimensional woven composite material, selecting a processing surface of a test piece, and aiming at interface fracture For the requirements of the toughness test piece, choose a compact tensile form, including two loading holes, a notch and a crack tip incision. The crack tip incision is processed in the middle of two parallel warp or weft yarns, and the cutting position is selected in the middle of a single row of fiber bundles , to ensure that there is only one row of warp yarns or only one row of weft yarns inside the cut test piece; 2. Use pins or other forms to insert into the loading hole, connect the interface fracture toughness test piece with the mechanical testing machine, and use the mechanical testing machine to test the interface fracture toughness. For the test piece, calculate the fracture toughness of the interface fracture toughness test piece according to the load-displacement curve output by the testing machine. The present invention firstly proposes a method for obtaining the mode I fracture toughness test of the interface of the three-dimensional woven composite material, which fills up the gap in this field.

The invention discloses an anti-rut agent for cool mixing and cool spreading of an asphalt road. The anti-rut agent mainly comprises a high-rigidity normal-temperature asphalt blend and a concentrated curing agent, wherein the curing agent and the normal-temperature asphalt blend are cured to form reinforced fibers, and a polymer and the curing agent have chemical bonding, thus the interfacial binding is also strengthened, and the interfacial fracture energy can be improved, therefore, the overall toughened, high-strength and consistent gel structure can be formed by modifying the normal-temperature asphalt. In addition, the different amounts of the curing agents have certain impact on demulsification of the asphalt blend. The usage amounts of the curing agent and the emulsifier can be selected according to the construction requirements, and the demulsification time can be controlled so as to guarantee the successful running of the construction.

A forming mold for testing the fracture performance of dissimilar concrete interfaces and a preparation method, the forming mold comprises a base plate, two front and rear baffles, two left and right baffles, an isolation baffle and a pre-embedded plate, wherein the base plate, the front and rear baffles It is fixed perpendicular to the left and right baffles to form the forming cavity of the dissimilar concrete composite specimen. The middle of one left and right baffles is provided with a cubic protrusion extending downward from the top to the bottom plate; the two sides of the isolation baffles are respectively fixed on The opposite side of the cubic protrusion and the other left and right baffles; one side end of the embedded plate is fixed on the cubic protrusion, and the other opposite side end is suspended. The present invention also provides a method for preparing a dissimilar concrete composite specimen by using the forming mold, which has the advantages of simple operation, low cost and reusability, and can precisely control the interface position of dissimilar concrete to ensure that no material intermixing occurs at the interface position, so as to reveal The law of fracture performance of dissimilar concrete interface provides technical support for the design of dissimilar concrete structures.

The invention provides a second-generation high-temperature superconducting strip interface fracture toughness test method, which includes the following steps: (1) solidifying a reinforcing layer with a thickness much larger than that on both sides of the superconducting strip to form a composite beam structure and serve as a Test sample; (2) Coat the speckle on the narrow side of the sample length direction; (3) Cut the initial crack at one end of the sample superconducting strip, then load the sample on the tensile machine, and the CCD Aim the camera at the speckle-coated side of the sample; (4) Carry out Type I and Type II interlaminar fracture experiments respectively; (5) Use the digital image correlation method to calculate the Type I and Type II interlaminar fractures of the sample Toughness, the result is the type I and type II interlaminar fracture toughness of the superconducting tape. In the present invention, by adding a reinforcing layer with a thickness much larger than the superconducting strip on both sides of the superconducting strip, the fracture toughness of the superconducting strip can be measured by a conventional experimental method, and the experimental method is simple and has high accuracy.

The invention discloses an SEM in-situ tensile test method for researching an interface fracture behavior of a metal matrix and a ceramic film layer, and relates to an SEM in-situ tensile test method.The invention aims to solve the problem that an SEM in-situ tensile sample and a tensile test mode of an existing homogeneous material are not suitable for revealing the fracture process and mechanism analysis of a brittle film layer and a plastic matrix system. The method comprises the following steps: 1, preparation of an in-situ tensile sample; 2, sample treatment; and 3, recording of mechanical property parameters and microtopography in real time in the in-situ tensile process, so as to finish the SEM in-situ tensile test method for researching the interface fracture behavior of the metalmatrix and the ceramic film layer.

This application discloses a test fixture and its test method for obtaining fracture mechanics parameters of asphalt mortar and aggregate interface at the mesoscopic scale. The test fixture includes the following components: test fixture main body, specimen pouring platform and asphalt mortar film thickness Control flap; test method includes the following steps: screening aggregates, pouring epoxy hard glue, cutting aggregates, pouring asphalt membrane, pasting fixtures, installing end wedge fixtures, applying loads and recording data, and calculating interfacial tensile fracture mechanics parameters; this test method can realize the determination of the tensile fracture mechanics parameters of the asphalt mortar and aggregate interface at the mesoscale, and can eliminate the influence of factors such as size effects and boundary conditions in the macroscale test; this method can quantitatively control the asphalt mortar It is suitable for measuring the interface between different types of asphalt mortar and aggregates.

The invention provides a wire planting reinforced brazing method for C / C and C / SiC composite materials and metal, and belongs to the technical field of heterogeneous material connection. An electric spark punching mode is adopted, certain regularly-distributed blind holes are machined in the to-be-welded face of the composite material in advance, high-strength metal wires (W, Mo, Nb and the like) are implanted into the holes, and the length of the metal wires is controlled so that the metal wires can slightly protrude out of the surface of the composite material; and then the composite material planted with the metal wires is connected with metal in a brazed mode, so that a brazed joint with the high-strength metal wires penetrating through the interface of the composite material / the connecting layer is obtained. According to the connecting method, the interface fracture energy of the composite material / connecting layer can be remarkably increased through the pinning and strengthening effects of the metal wires, and then the high-strength composite material-metal connecting joint is obtained; in addition, low-thermal-expansion metal wires such as W, Mo and Nb are implanted, so that the residual thermal stress of the joint is reduced, the stress distribution state is changed, the stress concentration of the outer surface of the composite material close to the interface is reduced, and the strength and reliability of the joint are further improved.

The invention relates to the field of connecting rod manufacturing, in particular to a method for manufacturing a cracked connecting rod. The connecting rod is produced by casting or combined casting and forging process. During casting, a suitable material is placed at the interface (3) of the large head of the connecting rod cavity to interact with the molten metal and form a cracking interface after cooling. By applying a bursting load in the big hole of the connecting rod, the connecting rod body (2) and the connecting rod cover (4) are broken and split along the prefabricated cracking interface, and the intermeshed dog-tooth structure formed on the fracture surface makes the connecting rod body It has good meshing and repeat positioning characteristics with the connecting rod cover, and realizes the precise assembly of the two. This connecting rod manufacturing method can break through the limitations of cracking technology on connecting rod materials, and apply cracking technology to the manufacturing of connecting rods made of materials such as aluminum alloy, titanium alloy, and 40Cr steel; it can effectively improve the connecting rod existing in the actual cracking process Bulk tearing, cracking, slag falling, fracture surface deformation and other problems.