31 results about "Interfacial fracture" patented technology

The invention relates to a method for testing a mechanical property of a braze welding connector. The method comprises the following steps: (1) preparing a T-shaped tensile sample; (2) preparing test equipment including an electronic universal testing machine, a clamp, a heating furnace, a temperature control system and a control system; (3) installing the T-shaped tensile sample; (4) testing the mechanical property of a T-shaped tensile sample connector in an environment of the room temperature; (5) testing the mechanical property of the T-shaped tensile sample connector in a high-temperature environment; (6) representing the mechanical property of the connector: integrating a load-displacement curve, dividing the area of a fractured surface to obtain fracture total energy, calculating interface fracture energy (refer to the specification) and a maximal load (refer to the specification) when in fracturing, wherein the interface fracture energy and the maximal load are main parameters representing the mechanical property of the tensile sample. The T-shaped connector sample conforming to the real structure stress situation is provided; the problem that the method for testing the mechanical property of the braze soldering plate-fin structure is in lack and the rest result is incorrect can be solved; the test method is simple, data can be automatically acquired, error in manual operation can be avoided, more efficiency in test can be achieved, and the test result is more accurate.

The invention discloses a device and a method for testing mechanical parameters of bumping diffusion process of a bridge asphalt pavement, aiming at precisely testing the relationship of bumping deformation characteristic parameters of bridge pavement material and applied load, and calculating the interfacial fracture performance and destructive strain of bumps of different pavement systems. According to the technical scheme, the device comprises an environment box arranged on a support frame, wherein a test piece fixing mount is arranged in the environment box, and is connected to a pressurized oil cylinder through an output oil pipe, the pressurized oil cylinder is connected with an MTS fatigue testing machine and can press hydraulic oil into a test piece to generate load action; and a temperature and humidity sensor and a temperature and humidity generation controller are arranged in the environment box, and a camera capable of photographing the surface bumping deformation of the test piece is arranged at the top of the environment box, and is connected to an MTI-3D structural deformation measurement system capable of processing and analyzing the surface bumping deformation of the test piece.

The invention relates to the technical field of mechanical property test devices, in particular to a device and a method for testing the adhesive property of fiber reinforced composite reinforced concrete. The device comprises an installation support and a balance box, a movable platform and a fixed platform are sequentially installed on the installation support from bottom to top, the movable platform extends outwards to form an impact part, and a first storage space used for storing a first test block and a second storage space used for storing a second test block are formed in the movable platform and the fixed platform respectively; the balance box is connected with the movable platform through a connecting piece, a balance weight is arranged in the balance box, and the connecting piece bypasses the top of the installation support, so that the balance box and the movable platform are located on the two sides of the installation support. Accurate energy consumed by fracture of a fiber reinforced composite material sheet can be obtained by measuring the difference between the energy of an impact piece impacting the movable platform and the energy of the movable platform, the first test block and the impact piece after the connection interface is fractured.

The invention provides a device and a method for testing fracture toughness of a solid-ice interface of a coating layer material surface under a large-area icing condition. The testing method adopts asingle cantilever beam loading principle, utilizes bending stress of a metal substrate to induce initiation and expansion of microcracks at a solid-ice interface, and aims to observe an interface fracture behavior between the surface of a coating layer material taking a metal as a substrate and an ice layer so as to obtain the interface fracture toughness between the ice layer and the surface ofthe substrate. The method has the advantages that the anti-icing performance of a large-area component coating layer material can be accurately evaluated, operation is easy and convenient, the purposeof objectively evaluating the fracture toughness of a solid-ice interface under a large-area icing condition is achieved, and important significance is achieved for industrial application and development of the anti-icing surface; and the testing device is simple in structure, ingenious in design and easy to operate, and has a good using effect.

The invention discloses a high-temperature environmental thermal barrier coating surface and interface fracture toughness three-point bending detection method. The method comprises the steps that a thermal barrier coating with a preset thickness is sprayed on a substrate layer according to first preset parameters; a groove with a preset depth is cut in the surface of the thermal barrier coating, and a simulation sample is obtained, wherein the preset depth is smaller than the preset thickness; and the simulation sample is heated for a preset time under a preset temperature, and a to-be-detected sample is obtained; and the surface fracture toughness and interface fracture toughness of the to-be-detected sample are detected. Through the method, one-time DIC (digital image correlation) observation of the thermal barrier coating is realized, the surface fracture toughness and interface fracture toughness of the thermal barrier coating can be detected, and the problems that surface fracturetoughness detection and interface fracture toughness detection of an existing thermal barrier coating need to be performed respectively, and repeated operation of DIC observation is complicated and tedious and consumes a long time are solved. Therefore, the detection efficiency of the surface fracture toughness and interface fracture toughness of the thermal barrier coating is improved, materialloss is reduced, and cost is saved.

The invention relates to a method for improving the performance of a medium manganese steel resistance spot welding joint. The method comprises the following steps that 1) the austenitizing end temperature AC3, the austenitizing initial temperature AC1 and the martensite transformation starting temperature MS of a medium manganese steel plate to be welded are tested; 2) the medium manganese steelplate is placed between two electrodes of a resistance spot welding machine, and a constant electrode pressure of 2.0-8.0 kN is applied to clamp the medium manganese steel plate; 3) a connection pulseis applied for melting the medium manganese steel in the welding area to form a required nugget size; (4) reciprocating phase change pulses are applied, the reciprocating phase change pulses are twoor more pulses, the current value and the action time of each pulse are equal or unequal, each pulse current is 3-10 kA, the action time is 3-30 cyc, and the time interval between the pulses is 5-30 cyc; and after the reciprocating phase change pulse is finished, the nugget is cooled by 5-25 cyc under the action of electrode pressure. According to the method, the bearing capacity of the medium manganese steel spot welding joint can be improved by 3 times, and the joint fracture mode is changed from complete interface fracture to button fracture.