13 results about "Tensile shear" patented technology

The utility model relates to the field of hydraulic tensile shearing test fixture, disclose a V type notch hydraulic tensile shearing fixture, including upper clamping concrete, sample and lower clamping concrete, the upper clamping concrete and lower clamping concrete upside down both ends are fixed with the handle at the edge, the upper clamping concrete and lower clamping concrete opposite side fixedly set up with the jack, the lower clamping concrete front end fixedly set up with the centring block, the upper clamping concrete front end fixedly set up with the upper joint, the lower clamping concrete rear end fixedly set up with the lower joint, the upper joint and lower joint outside all are threadedly equipped with lock nuts. In the utility model, through optimization design and stable clamping system, the fixture significantly reduces the skidding phenomenon in the test, ensures the accuracy of test result, effectively improves the consistency of test result, simultaneously, the simple operation design of fixture not only shortens the preparation time, but also improves the test efficiency, reduces the working strength of operating personnel.

The present application provides a surface protective film in which an end portion of an adherend is not deformed, and an optical laminate provided with the surface protective film. The surface protective film according to an embodiment of the present application is provided with a base film and an adhesive layer, and has a peeling force of 0.025 N / 25 mm or more with respect to an adherend having a water contact angle of 70° or more and less than 90°, and a tensile shear force of 5.0 N or more with respect to an in-plane direction of the adherend, where the tensile shear force with respect to the in-plane direction of the adherend is a breaking force measured in accordance with JIS K 6850:1999.

To provide a surface protection film that prevents deformation of the edges of the adherend, and an optical laminate equipped with such a surface protection film. [Solution] The protective film according to an embodiment of the present invention comprises a base film and an adhesive layer, and has a peel force of 0.025 N / 25 mm or more for an adherend with a water contact angle of 70° or more and less than 90°, and an in-plane tensile shear force of 5.0 N or more for the adherend: where the in-plane tensile shear force for the adherend is the breaking force measured in accordance with JIS K 6850:1999.

This invention discloses a prestressed tensile-shear multi-joint PHC pile connection structure and construction method, belonging to the field of PHC pile connection technology. It includes multiple PHC pipe piles and a pile cap foundation. A fixing lock head connection device is pre-embedded at the root of the bottom PHC pipe pile, with the bottom end connected to a steel pile tip. A prestressed steel strand assembly passes through the interior of multiple PHC pipe piles and is used in conjunction with the lock head connection device. The lock head connection device includes an anchor ring pre-embedded at the root of the bottom PHC pipe pile, with two symmetrical baffles at the bottom of the anchor ring. A V-groove is formed in the middle of the anchor ring, with a locking hole at the bottom of the V-groove. The prestressed steel strand assembly includes a steel strand bundle, one end of which passes through the anchor ring pad and the upper anchor ring, and the other end is fixedly connected to a pointed lock head. A positioning plate is also provided, which can drive the pointed lock head through the locking hole. The positioning plate can drive the pointed lock head vertically down until it passes through the locking hole, enabling the steel strand bundle to be connected inside the PHC pipe pile after the multiple PHC pipe piles are connected, avoiding damage to the steel strand bundle during pile driving.

This application belongs to the field of adhesive testing technology and discloses a sample preparation tool for bonding adhesive tensile shear specimens. It comprises an upper mold and a lower mold that cooperate with each other. The lower mold has a first placement groove and a second placement groove arranged side-by-side. The bottom of the first placement groove is higher than the bottom of the second placement groove. Several gasket grooves are formed inward from the bottom of the first placement groove. First limiting posts are arranged on both sides of the gasket grooves in the first placement groove. Several rows of second limiting posts are correspondingly arranged on the bottom surface of the second placement groove. Several spring grooves are provided on the lower surface of the upper mold corresponding to one side of the second placement groove, and spring plates are placed in the spring grooves. By using the upper and lower molds to apply uniform and continuous pressure to the specimen, the adhesive is subjected to uniform force during curing, ensuring a good bonding effect. By placing gaskets in the gasket grooves and combining this with the elastic pressure of the spring plates, the adhesive layer thickness is controlled, ensuring a uniform adhesive layer and meeting the requirements of different adhesive layer thicknesses in bonding tests.

This invention discloses a method for controlling slurry fracturing and grout leakage in shield tunneling in clay strata, belonging to the technical field of shield tunneling risk prediction. The method includes: acquiring stratum, slurry, and tunnel parameters; calculating the slurry fracturing initiation pressure based on the tensile-shear failure combination criterion; establishing a crack propagation model to predict crack length; determining whether the crack penetrates the surface and assessing the risk of slurry eruption and excavation face instability; calculating the ultimate tunneling speed and lower limit of support pressure based on crack propagation characteristics; and finally dynamically controlling construction parameters to prevent slurry fracturing, grout leakage, and excavation face instability. This invention achieves quantitative prediction of the entire process of slurry fracturing risk from initiation to grout leakage, provides control thresholds for support pressure and tunneling speed, and can effectively guide slurry shield tunneling in clay strata, improving construction safety and risk control capabilities.

The application provides a 0.13C-7Mn medium manganese steel spot welding joint low-temperature tempering process, which comprises the following steps: providing two 0.13C-7Mn medium manganese steel sheets with a thickness of 1.4-1.8 mm, directly contacting and overlapping the two 0.13C-7Mn medium manganese steel sheets, and obtaining a double-layer structure of the medium manganese steel sheets; using a medium-frequency inverter spot welding machine to perform resistance spot welding on the double-layer structure of the medium manganese steel sheets, and obtaining a resistance spot welding joint; placing the resistance spot welding joint in a furnace for tempering treatment; and taking out the sample after the heat preservation ends, and air cooling to room temperature. Through the low-temperature tempering process at 250 DEG C for 10-20 min, the tensile shear peak load of the 0.13C-7Mn medium manganese steel spot welding joint is increased by 89.6%-104.8%, the failure mode is changed from brittle interface failure to pull-out failure, the welding residual stress is released, and the Mn element grain boundary segregation is relieved.

This invention discloses a composite welding method for copper-aluminum dissimilar metals using zinc-modified Sn material as an intermediate layer, belonging to the field of welding technology. This invention addresses the problem of insufficient welding performance of copper-aluminum dissimilar metals in semiconductor packaging technology. The preparation of the zinc-modified Sn material involves: passivating Zn particles under argon protection to obtain pretreated Zn particles; then, under nitrogen protection, uniformly mixing the pretreated Zn particles and Sn alloy powder to obtain the zinc-modified Sn material; wherein the Sn alloy powder, by mass percentage, comprises 0.06–0.5% Sb. The composite welding method of copper and aluminum dissimilar metals using zinc-modified Sn material as the intermediate layer, provided by this invention, yields joints with excellent tensile and shear strength, making the welded joint less prone to failure under load. When applied to semiconductor heat dissipation systems, it provides excellent airtightness, ensuring the normal operation of semiconductor devices.

The application discloses a metal and carbon fiber reinforced thermoplastics (CFRTP) laser connection method based on a five-axis femtosecond laser reverse-docking self-locking microstructure, and belongs to the technical field of heterogeneous material laser connection. The method comprises the following steps: pretreating surfaces of metal and CFRTP plates to be connected; adopting a five-axis linkage femtosecond laser processing system, and synchronously forming a laser-induced periodic surface structure on an inner wall of a groove by adjusting and controlling a deflection angle of laser incident light relative to a normal line of a workpiece surface to prepare a reverse-docking self-locking microstructure array with a notch width smaller than the maximum width of a groove bottom on the surface of the metal to be connected; overlapping and assembling the processed metal and the CFRTP plate and applying clamping pressure, and performing heat conduction laser connection with the metal side as a laser incident surface, so that a resin matrix in the CFRTP is melted and filled into a widened area at the bottom of the reverse-docking self-locking microstructure; after cooling and solidification, the resin forms an embedded body with a large head and a small neck in the microstructure, thereby generating geometric limiting and anti-pulling-out effects along the normal direction of the connection interface. The method can improve the tensile shear strength, anti-peeling performance and fatigue bearing stability of a metal-CFRTP connection joint, and is suitable for reliable connection of metal-composite materials in aerospace lightweight structural parts.

The application discloses a tensile-bending stiffness decoupling method in fiber preform die forming simulation, and relates to the technical field of simulation learning, and comprises the following steps: a macro finite element model composed of triangular shell elements is established; a biorthogonal fiber coordinate system aligned with the yarn direction is established in each element. Tensile, shear and bending stiffness changing with deformation state are obtained and a constitutive equation is constructed. In the element, an in-plane model controlled by tensile and shear stiffness and an out-of-plane model independently controlled by bending stiffness are respectively established to realize stiffness decoupling. In each increment step, the biorthogonal coordinate system is updated according to the deformation gradient, and after stress is calculated in the biorthogonal coordinate system based on the constitutive equation, the stress is converted to the global coordinate system. Finally, boundary conditions are applied for numerical solution to obtain deformation field, stress and strain distribution and fiber orientation evolution results. The application decouples tensile stiffness and bending stiffness, and eliminates false stiffness in a traditional model.