31 results about "Interfacial fracture" patented technology

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 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.