53 results about "Tensile shear" patented technology

The invention discloses a plasma-assisted surface activation method. The method comprises the following steps: placing a material matrix in a reaction cavity, vacuumizing, introducing oxygen and inert gas, exciting a radio frequency power supply and a microwave power supply to form multi-frequency composite plasma, and treating the material. The physical bombardment of the radio frequency plasma and the chemical activation of the microwave plasma have a synergistic effect, and deep cleaning and efficient modification of the surface of the material are realized in a low-vacuum environment. The surface water contact angle of the treated material is reduced to 35 degrees or below, the adhesive force of a coating reaches 0-1 level, the tensile shear strength is improved to 22.5 MPa or above, the problems that a traditional surface treatment method is unstable in effect and insufficient in modification depth are effectively solved, and the surface treatment method has the outstanding advantages of being high in treatment efficiency, uniform and lasting in modification effect, environmentally friendly and the like.

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 utility model provides an aluminum sheet surface phosphoric acid anodizing treatment device for a single-lap tensile shear test of an adhesive film, which comprises a reaction tank filled with phosphoric acid electrolyte; the aluminum sheet is arranged at one end in the reaction tank in a hanging manner and is connected with the positive electrode of the power supply; the lead plate is arranged at the other end in the reaction tank in a hanging manner and is connected with the negative electrode of the power supply; the heater is arranged in the reaction tank and is used for heating the phosphoric acid electrolyte; the areas of the lead plate and the aluminum sheet immersed in the phosphoric acid electrolyte are set as S1 and S2 respectively; the range of S1 to S2 is 1: 1-1: 10. By designing the special aluminum sheet surface phosphoric acid anodizing treatment device, instant and small-batch phosphoric acid anodizing treatment on aluminum sheets in a laboratory environment is realized, and the problem that the existing industrial batch production mode is difficult to meet small-scale and high-frequency flexible requirements is solved; and the rapid verification requirement on a small amount and multiple batches of samples in the adhesive film research and development stage is met.

The present application relates to a full-face tunneling device for soil or rock stratum, and particularly relates to a rock breaking method, a rock breaking device and a tunneling device. The rock breaking method comprises the following steps: 1) using a cutting edge of a cutter with a cutter driving device to obliquely cut into rock, and moving the cutter until a cutting groove capable of allowing the cutter to enter as a whole is excavated on a cutting surface; 2) adjusting the posture of the cutter, or exchanging the cutter, so that the cutting edge of the cutter is parallel to the groove wall of the cutting groove, and the cutter is translated until the excavation of the cutting surface is completed. In steps 1) and 2), the direction of the cutting edge of the cutter and the driving load are substantially in the same direction. Therefore, the bending moment borne by the cutting edge can be avoided, and the chipping of the cutting edge can be reduced, thereby prolonging the normal working period of the cutter and reducing the number of shutdowns. In summary, the rock breaking method of the present application can fully utilize the characteristics that the tensile shear strength of rock is lower than the compressive strength, realize the tensile shear failure of hard rock, improve the rock breaking efficiency, and reduce the loss of the rock breaking device.

This invention relates to the field of injection molding technology, specifically disclosing a stretch-reinforced mixing element, including at least one stretching component and at least one shearing component. It can function as a single screw in an injection molding machine, with the material conveying direction set from the stretching component to the shearing component. Various plastic masterbatches are fed into the injection molding machine's feed inlet, forming a molten flow under high temperature. The flow is then diverted by the stretching component, which stretches the flow before it enters the shearing component. The shearing component shears and disperses the flow, ensuring thorough mixing. This combination of dispersion, stretching, and shearing improves the mixing effect and prevents degradation of shear-sensitive material molecular chains due to the lack of significant shear force, thus avoiding any impact on the material's properties during the mixing process.

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.

The invention provides a preparation method of a bio-based reversible cross-linked polyurethane hot melt adhesive. The method comprises the following steps: firstly, carrying out polymerization reaction on bio-based polyol PO3G (poly trimethylene ether glycol) and isophorone diisocyanate which are used as raw materials to prepare an isocyanate-terminated bio-based prepolymer; then, diethyl toluenediamine and isophthaloyl hydrazine are adopted as a mixed chain extender for a chain extension reaction, and after drying treatment, the bio-based polyurethane hot melt adhesive is obtained. The bio-based hot-melt adhesive prepared by the invention is suitable for hot-melt sealants in the field of electronic devices. The adhesive shows good bonding performance to a stainless steel base material, the tensile shear strength reaches 0.45-0.5 MPa, the adhesive has excellent reversible disassembly characteristic, and convenient separation of a bonding interface can be achieved by heating at 100 DEG C for 10 minutes.

The present application relates to the technical field of aircraft body structure repair, in particular to a method for improving the adhesion of composite material bonding repair metal structure, comprising the following steps: determining the damage range by visual inspection and non-destructive testing method; then using artificial polishing method to pretreat the surface of the damaged part; preparing composite patch material, adhesive and related auxiliary materials; laying the patch according to the design requirements; packaging the vacuum bag, installing the heating unit and curing; post-processing the patch; checking the composite patch; according to the gap size and area size of different regions, cutting the appropriate size of glass fiber fabric; marking the installation position of the patch by using the red pencil line method; mixing the glue; cutting a layer of glass cloth, the size of which is larger than the total size of the required filling size, and the glass cloth is treated by dipping in glue. The present application can effectively control the thickness of the glue layer, increase the controllability of the repair process, improve the tensile shear strength after bonding, effectively improve the actual repair effect, and meet the actual use requirements.

The embodiment of the invention provides a method for measuring a crack angle, which comprises the following steps: acquiring a sample from an on-site welded junction of a full-automatic circumferential weld of a pipeline, and manufacturing a circumferential weld compact tensile shear test piece containing an initial crack; a preset arc-shaped clamp matched with the circumferential weld compact tensile shear test piece is prepared; the circumferential weld compact tensile shear test piece is fixed to a preset arc-shaped clamp, a compact tensile shear test is conducted through a testing machine, and loading is conducted till the test piece is fractured; in the compact tensile shear test process, the expansion directions of the cracks at different loading angles are obtained in real time by adopting a digital image related technology, and the corresponding crack angles are measured according to the expansion directions; a crack angle measurement model is constructed by combining the corresponding relation between the crack angle obtained through measurement and the loading angle; and according to the crack cracking angle measurement model, predicting the to-be-measured loading angle of the field welded junction, thereby improving the prediction precision of the crack cracking angle.

The present application provides a kind of multiple injection shear sample forming die, by setting first cavity and second cavity of terminal overlap, and the switching slider that can realize first cavity and second cavity communication or separate, and the switching insert that realizes second runner and second cavity communication or disconnect, can complete in sequence in two cavity respectively independent injection molding, and in two cavity overlapping portion (double cavity) realize twice injection remelt, form fusion interface, obtain shear sample;The shear sample obtained is stretched by universal testing machine Shear test, and the shear strength is obtained, which is used to evaluate the performance of the fusion interface formed by the insert injection molding of any two materials. The influence law of different factors on the performance of the fusion interface obtained by the experiment can be used to guide the actual product production.

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 invention belongs to the field of electrical equipment technology and discloses a method for calculating the dynamic response of dry bushings under seismic loading and establishing a core crack damage model. After simulating the vibration response of transformer bushings under seismic conditions, this invention can obtain various important data, including acceleration response, displacement response, actual stress, deformation degree, and stress concentration. This allows for the adjustment and optimization of various structural and material parameters. Through this simulation, the various physical effects in 110kV resin-impregnated paper dry bushings can be predicted, and the service life of the material in actual scenarios can be accurately determined. This invention establishes two fracture phase-field models to simulate crack propagation in thin plates under different loading conditions. By establishing a phase-field model for isotropic plate fracture problems, numerical calculations are performed using finite element analysis software to study the crack propagation process of thin plates with initial cracks under tensile and shear loads, and the influence of various parameters on crack propagation is calculated.

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.

The application discloses a high core wall dam mixed clay tensile-shear fracture test method without friction influence, which comprises the following steps: S1, collecting soil samples and determining the optimal water content and the maximum dry density; S2, designing various test conditions; S3, combining a front half of a mold and a rear half of the mold; S4, assembling a compaction fracture mold; S5, preparing and compacting the mixed clay soil sample; S6, transferring the compaction fracture mold to a hollow test tank; S7, removing a Z-shaped compaction plate and a rectangular ring wall; S8, suspending the test part of the compaction fracture mold; and S9, carrying out the tensile fracture test or the shear fracture test of the mixed clay of the core wall. In the application, the tensile fracture and the shear fracture characteristics of the mixed clay can be studied on the same test device, and the friction does not need to be considered. The application fundamentally solves the problem that the existing soil body fracture test method cannot be used for determining the fracture characteristics of the mixed clay of the high core wall dam, and fills the blank of the test method of the mixed clay of the high core wall dam.

The present application relates to a kind of surface pretreatment-repairing method of composite material, belong to the technical field of composite material surface treatment, for solving the existing composite material bonding repair process The mechanical removal of easy to cause secondary damage to the surface of composite material, the interfacial bonding strength of repaired composite material is lower;Bonding repair process long curing time Problem.It includes: using ultraviolet laser scanning the damage site of composite material, remove the damage site of composite material;The composite material treated in step 1 is cleaned;Adhesive interface is activated using low-temperature plasma;Lay adhesive film, scrape flat;Then lay patch, scrape flat and compact, then package;Heat curing, curing stage is assisted by ultrasonic radiation;After heating and curing, the repaired area is polished.The interfacial tensile shear strength of the composite material repaired by the surface pretreatment-repairing method of composite material of the present application is significantly improved;And shorten the curing time.

The present application relates to a kind of ring-shaped nugget resistance spot welding joint fracture form judging method under tensile shear load, belong to resistance spot welding quality detection field.The welding joint of ring-shaped nugget resistance spot welding is ultrasonically tested, the inner diameter size of ring-shaped nugget, outer diameter size are extracted as characteristic value, and the fracture form of welding joint is judged based on ring-shaped nugget resistance spot welding joint fracture model.Firstly, the fracture form criterion of ring-shaped nugget under tensile shear load is proposed, and the nugget failure of resistance spot welding is fully considered as a complex phenomenon involving the interaction between nugget geometric factor, welding joint metallurgical performance and mechanical loading mode.The ring-shaped nugget model is idealized as the ring-shaped nugget with drum-shaped vertical section, and the numerical relationship between the maximum shear force of ring-shaped nugget horizontal interface and the maximum tension of ring-shaped nugget outer heat affected zone and base material (fracture position) is compared, so that the failure form of ring-shaped nugget is more accurately determined.

The application relates to a composite material repairing method, belonging to the technical field of composite material surface treatment, and solving the problems of low interface bonding strength of the repaired composite material and low repairing efficiency of the adhesive repairing process. The method comprises the following steps: removing the damaged part of the composite material by a mechanical removal method; scanning the interface after removal by an ultraviolet laser for multiple times to remove the mechanical damage layer generated due to the mechanical removal; cleaning the composite material after the step 2 treatment; activating the adhesive interface by a low-temperature plasma; laying and pasting an adhesive film and scraping; then laying and pasting a patch, scraping, compacting, and then packaging; heating and curing, and adopting ultrasonic radiation for auxiliary curing in the curing stage; and polishing the repaired area after heating and curing. The interface tensile shear strength of the composite material repaired by the method is increased by 38% compared with the strength of the existing single sandpaper polishing, the repairing quality is improved, and the curing time is shortened.

The utility model relates to the technical field of rivets, in particular to a special-shaped single-drum rivet which comprises a rivet core and a rivet shell arranged on the rivet core in a sleeving mode. The rivet core comprises a rivet head, a riveting section, a snapping section and a rivet rod which are sequentially arranged in the length direction of the rivet core, and first cross grain teeth and second cross grain teeth are arranged on the peripheral face of the riveting section in a surrounding mode. The nail shell comprises a nail shell body and a nail cap, and an inverted circular truncated cone is arranged at the end, away from the nail shell body, of the nail cap. When the rivet core and the rivet shell are assembled, the rivet shell is located on the side, close to the riveting section, of the rivet head, the rivet head abuts against the end, away from the rivet cap, of the rivet shell body, and the inner wall of the inverted circular truncated cone is meshed with the second transverse grain teeth during rivet pulling. According to the special-shaped single-drum rivet, the rivet core is locked, the situation that workpiece connection is loosened due to the fact that the rivet core falls off from the rivet shell is avoided, a riveting part is prevented from being fractured under the action of external force, and the problems that the riveting part of a workpiece riveted through a traditional rivet is prone to being fractured, stable connection between the workpieces cannot be guaranteed, and the service life of the workpiece is prolonged are solved. And the problems of low tensile and shear resistance and low capability of preventing the rivet core from being ejected are solved.

The invention provides a fragile joint base material tensile shear test tool, equipment and method, the fragile joint base material tensile shear test tool comprises two support plates, any support plate is provided with an accommodating groove, two mutually bonded fragile test pieces can be respectively embedded in the accommodating grooves of the two support plates, the support plate base material is metal, and the support plate base material is made of metal. And the shear force transmission assembly is detachably connected to an external shear force test assembly so as to transmit the shear test force of the external shear force test assembly to the brittle test piece. According to the invention, the carrier plate is used for replacing a traditional clamp for direct clamping, clamping force and shearing force of an external shearing force test assembly are uniformly dispersed to the whole carrier plate by means of the rigid metal carrier plate, local stress concentration of a brittle test piece is avoided, and meanwhile, load impact is rigidly supported and buffered by means of the carrier plate; the problem that glass and other brittle test pieces are prone to fragmentation in a traditional mode is fundamentally solved, and the device has the advantages of being simple in structure, convenient to operate, wide in application range, high in detection precision, long in service life, capable of protecting the brittle test pieces and the like.

The invention belongs to the technical field of aircraft body strength design, and particularly relates to a tension-shear separation design method for a uniaxial load bearing connector and the load connector. On the basis of a given uniaxial load and a fixed supporting surface of a machine body structure, a load transfer path for separately transferring a shear load and a tensile load is provided, and a boss / groove is arranged on a joint bottom plate to be precisely matched with the machine body structure and is used for transferring the load in a mounting plane; meanwhile, the bolt hole is expanded to prevent the hole wall from being in contact with the bolt, and the bolt only transmits the load perpendicular to the mounting plane. Therefore, a uniaxial load borne by the joint lug is decomposed into a shear load transferred by the boss / groove of the joint bottom plate and a tensile load borne by the bolt, load separation is realized, and the design of the joint and a machine body structure is optimized.

The present application belongs to the technical field of welded structure reliability evaluation, and particularly relates to a calculation method of stress intensity factor of gap defect weld under tensile shear load, comprising: selecting an automobile sheet part as a research object, and constructing a strip two-dimensional model of a gap defect weld containing an initial gap; based on the linear elastic superposition principle, the load borne by the gap defect weld is decomposed into multiple load types; based on the strip two-dimensional model of the gap defect weld containing the initial gap, the analytical solution of the stress intensity factor under the load generation mode corresponding to different load types is calculated respectively, and the analytical solution of the stress intensity factor under different load generation modes is calculated; a finite element model of the gap defect weld is constructed and finite element analysis is carried out, and the finite element solution of the stress intensity factor under different load generation modes is calculated; the analytical solution and the finite element solution of the stress intensity factor under different load generation modes are compared, and the accuracy of the analytical solution of the stress intensity factor is verified.

The present invention relates to a test assembly for material tensile shear performance testing, the test assembly comprising: a loading disc; and a clamp, the clamp comprising an upper end clamp and a lower end clamp, the upper end clamp and the lower end clamp clamping an edge portion of the loading disc from above and below respectively via respective clamping slots, the clamping slots of the clamp being shaped to fit the edge portion of the loading disc such that relative movement of the clamping slots and the edge portion is prevented when the clamp is clamped and the edge portion is allowed to slide along the clamping slots and the loading disc is allowed to rotate when the clamp is unclamped.

The utility model discloses a fiber reinforced plastic tensile shear test anti-bending device which comprises two clamping plates, a left sliding plate and a right sliding plate, the two clamping plates are oppositely arranged, and the left sliding plate and the right sliding plate are arranged on the left side and the right side of the clamping plates respectively and connected through a connecting piece; a tensile shear sample to be tested is positioned between the two clamping plates. The device is used for solving the problem that in the tensile shear test process of the fiber reinforced plastic, the substrate near the test area, namely the lap joint area is bent abnormally, so that the accuracy of the tensile shear test of the fiber reinforced plastic is improved.

The invention discloses a structural adhesive and a preparation method thereof and a wind turbine blade, the structural adhesive comprises a component A and a component B, the mass ratio of the component A to the component B in the structural adhesive is 100: (35-45), and based on the total mass of the component A, the component A comprises 1 wt%-2 wt% of an assistant thixotropic agent, 0.8 wt%-1.2 wt% of a silane coupling agent, 2.5 wt%-3 wt% of hydrophilic fumed silica and the balance of components. The hydrophilic fumed silica is adopted in the structural adhesive, a good synergistic effect is generated after the proportion of the hydrophilic fumed silica, the silane coupling agent and the auxiliary thixotropic agent is adjusted according to the proportion of the structural adhesive, the tensile shear performance of the structural adhesive can be improved, meanwhile, compared with at least 8 wt% of silicon dioxide in an existing structural adhesive, the tensile shear performance of the structural adhesive is improved, and the tensile shear performance of the structural adhesive is improved. The silicon dioxide content is low, and the overall cost of the structural adhesive can be reduced.

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 utility model relates to an auxiliary sample bonding tool for a core material tensile shear test. Comprising a bottom plate, vertical plates are arranged on the two side edges of the bottom plate in the length direction, a jackscrew used for abutting against a bonding plate is installed on at least one vertical plate in a penetrating mode, positioning plates used for being in matched butt joint with a groove in one end of the bonding plate are arranged between the two vertical plates at intervals, and a moving gap used for moving of the bonding plate is formed between the two positioning plates. Through the structural design of the sample auxiliary bonding tool, the problems that in the prior art, when a core material and a testing tool are fixed in a manual bonding mode, the centering precision is low, the parallelism of two bonding plates and an adhesive layer are not uniform, visual adjustment depends on operators, strict parallelism of a sample and the stress axis of the tool is difficult to guarantee, and the working efficiency is high are solved. And the stress distribution is not uniform.

The invention belongs to the technical field of aircraft design, and relates to a method and a device for checking biaxial tensile-shear strength of a rhombic grid structure. The method comprises the steps that S1, the side length L, the long diagonal size 2a, the short diagonal size 2b and the beam frame width h of a grating unit are determined, the grating unit is a minimum repeated unit forming a grating structure, the grating unit is a rhombic beam frame, and the grating structure is a part of a full-aircraft structure; s2, axial tensile loads applied to the two ends of the long diagonals of the grating units, axial tensile loads applied to the two ends of the short diagonals of the grating units and axially symmetrical shear loads applied to the four ends of the grating units are obtained; and S3, the safety margin of the grid units is determined. According to the method, the calculation time is shortened, and the structure parameter iteration speed is increased.

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.