96 results about "Tensile shear" patented technology

The invention discloses a coal and rock mass fracture seismic source and stress field joint inversion method and system, and the method comprises the following steps: arranging a multi-channel sonic sensor in a coal and rock mass, and collecting original acoustic emission / microseismic signal data; the head wave arrival time / amplitude of the filtered effective waveform data is automatically picked up through an improved AIC (Akaike Information Code), quantitative evaluation is carried out on the quality of a picked-up result, and high-precision positioning is carried out on waveform signals with a high signal-to-noise ratio and a low signal-to-noise ratio; constructing a tension fracture seismic source model based on a displacement discontinuous tensor, obtaining a moment tensor component of a fracture event, and calculating to obtain a spatial orientation, a tension-shear attribute, a deviation angle alpha, energy release and a moment magnitude of the fracture; establishing a stress field inversion model of the tension-shear fracture seismic source, and realizing the inversion of the stress direction and size of the tension-shear fracture seismic source; and a slip direction included angle minimization objective function is established for iteration until convergence conditions are met, and joint iteration inversion of the fracture and the stress field is realized.

The utility model discloses a tensile shear and stripping test piece sample preparation tool, which belongs to the field of adhesive detection and comprises a bottom plate, a tensile shear sample preparation component and a stripping sample preparation component, and the tensile shear sample preparation component and the stripping sample preparation component are arranged on the bottom plate. The tensile shear sample preparation assembly comprises a first test piece groove and a second test piece groove which are formed in the bottom plate, and the first test piece groove and the second test piece groove are formed in the first direction; the stripping sample preparation assembly comprises two guide stand columns arranged on the bottom plate, a plurality of pressing blocks are arranged between the two guide stand columns in a sliding mode in the second direction, and test piece mounting grooves are formed in the pressing blocks in the third direction; the first test piece groove and the second test piece groove are located between the two guide stand columns, the pressing block is located above the second test piece groove, and the first direction, the second direction and the third direction are perpendicular to one another. The device can be used for simultaneously preparing a tensile shear test piece and a stripping test piece, and the adhesive layer thicknesses of different adhesives can meet the standard requirements by adjusting the pressure.

The invention relates to a comprehensive performance verification method for a wear-resistant layer of a turbine blade, and belongs to the technical field of turbine blades, the comprehensive performance verification method comprises a melting performance test, a pressure-resistant performance test, a wear-resistant performance test, a high-temperature hardness test and a tension shear test, and the melting performance test is performed on a welding rod made of a first material; the first wear-resistant layer made of the first material is subjected to a pressure resistance test, the second wear-resistant layer and the third wear-resistant layer made of the first material are subjected to a wear resistance test, the fourth wear-resistant layer made of the first material is subjected to a high-temperature hardness test, and the blade crown wear-resistant layer made of the first material is subjected to a tension shear test. The device has the beneficial effects that a fusion performance test, a pressure resistance test, a wear resistance test, a high-temperature hardness test and a tension shear test are carried out on the welding rod made of the first material, so that the comprehensive performance test on the welding rod made of the first material is realized, and whether the welding rod made of the first material can be used for processing a blade or not is judged; and the machining quality and safety of the blade are ensured.

The invention discloses a CFRP-steel interface ultimate bearing capacity prediction method based on an improved XGBoost algorithm, and belongs to the technical field of steel structure externally attached CFRP reinforcement, and the method comprises the following steps: obtaining tensile shear test data of a CFRP-steel interface, and carrying out preprocessing to obtain a test data set; wherein the test data set comprises a test set and a training set; based on an improved XGBoost algorithm, an initial CFRP-steel interface ultimate bearing capacity prediction model is constructed, and a loss function is determined based on prior physical knowledge; based on grid search and a five-fold cross validation method, determining optimal hyper-parameters of the initial CFRP-steel interface ultimate bearing capacity prediction model according to the test set and the loss function, obtaining the CFRP-steel interface ultimate bearing capacity prediction model, and performing evaluation and feature importance analysis respectively; acquiring ultimate bearing capacity data to be predicted, and processing the ultimate bearing capacity data through the CFRP-steel interface ultimate bearing capacity prediction model completing evaluation and feature importance analysis to obtain a prediction result.

The present invention addresses the problem of providing an adhesive composition having excellent tensile lap-shear strength and T-peel strength, and being capable of maintaining adhesion performance even when lap length is increased, while having high adhesive strength at joints. As a solution, provided is an adhesive composition characterized in that the fracture energy per unit area is 0.035 J / mm2 or more in a tensile lap-shear adhesion test when the fracture region is an adhesive layer.

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 invention relates to the technical field of metal bonding performance testing tools, in particular to a tensile shear experiment clamp suitable for multiple types of lap joints. The device is characterized by comprising two groups of stretching assemblies, each group of stretching assembly comprises a clamping end, a bottom plate, a first side plate, a second side plate and a guide rail, a sliding clamping plate for clamping a stretching sample is mounted on the guide rail, and first fixing holes, sliding clamping plate adjusting holes and first stretching stress holes are formed in the first side plates and the second side plates; the outer sides of the first side plate and the second side plate are respectively provided with a pressing plate, and each group of stretching assembly is provided with a screw pin shaft. By means of the sliding clamping plate and the pressing plate which can be adjusted up and down, sample plates with different thicknesses and lengths are clamped and fixed, the tool is suitable for multiple types of lap joints, it is guaranteed that a stretching stress central axis penetrates through a bonding plane, the application range is wide, the problem that one tool is only suitable for one type of joints is solved, and meanwhile the tool is suitable for various types of joints. And the tested shear strength is not accurate due to rotation of the sample during stretching.

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 invention relates to a high-toughness and high-strength epoxy structural adhesive film and a preparation method thereof, and belongs to the technical field of epoxy structural adhesives, a functional toughening agent is used as a synergistic toughening agent to synergistically toughen epoxy resin with thermoplastic resin, the high-toughness and high-strength epoxy structural adhesive film is prepared, the impact strength of the epoxy structural adhesive is improved to 60 kJ / m < 2 > or above, and the service life of the epoxy structural adhesive film is prolonged. The adhesive is used for bonding between aluminum alloy plates at room temperature, the peel strength is improved to 6 N / mm or above, the adhesive is used for bonding between the aluminum alloy plates and bonding between continuous carbon fiber composite plates at room temperature, the tensile shear strength is improved to 40 MPa or above, and the glass transition temperature is improved to 190 DEG C or above. The high-toughness and high-strength epoxy structural adhesive film disclosed by the invention has the characteristics of excellent processing property, outstanding mechanical property and bonding property, high strength, high toughness and the like, meets a large-area bonding forming process of metal or composite materials, meets the requirement of aerospace crafts on high-strength bonding of structural parts, and has a wide application prospect. The adhesive is suitable for bonding of metal or composite material structural members in the aerospace field.

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.

This invention involves a device for on-site evaluation of tensile strength and fracture properties of homogeneous and non-homogeneous materials. The lack of a device that can be used for field evaluation of fracture properties is one of the problems of the industry in the production of asphalt, concrete, stone, etc. The proposed design is a small, simple and portable device to overcome this deficiency by inducing ruptures in the sample. With the help of this device, it is possible to test the ring-shaped and cored parts quickly, uniaxially and biaxially. The device can create different mounting fixtures to activate traction, shear and combined modes. The invention performs the tests only with the help of a pneumatic pump, thus eliminating the need to transport the part to the laboratory. The device can also be used to determine the weakest point to ensure the accuracy of the estimates.

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 invention belongs to the technical field of coal mine underground reservoirs, and particularly relates to a design method for a flat plate type artificial dam body of a coal mine underground reservoir. Comprising the steps that strength parameters of the artificial dam body after performance degradation in the complex hydraulic environment are determined; an artificial dam body three-dimensional thick plate elastic mechanical model is constructed, boundary conditions of the artificial dam body three-dimensional thick plate elastic mechanical model are determined, the mechanical model is solved through an energy variational method, and the internal stress distribution condition of the artificial dam body is determined; constructing an artificial dam body stretching-shearing composite yield criterion; determining an artificial dam body design scheme feasible region based on a stretching-shearing composite yield criterion; and determining a reasonable design depth range of the artificial dam body cutting based on rigidity matching and shear resistance. According to the method, the stress distribution of the artificial dam body of the underground reservoir can be accurately obtained, accurate identification of different damage types can be realized, the reasonable slotting depth can be determined, the coordination and stability of connection between the artificial dam body and surrounding coal and rock masses can be effectively improved, and thus the stability and reliability of the artificial dam body in long-term operation are ensured.

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.

This invention provides a fuse element design method that significantly improves the lifespan of a fuse under pulsed current carrying capacity. Existing fuses operating at repetitive frequencies suffer from reduced lifespan due to high-temperature metallization electromigration aging and mechanical tensile shear stress aging under pulsed current carrying capacity. The fuse element of this invention is characterized by: a fuse body and at least one row of necks arranged side-by-side on the fuse body; the fuse body includes staggered upper and lower plates, and connecting plates connecting the upper and lower plates, the number of connecting plates being equal to the number of rows of necks, with the necks located in the middle of the connecting plates; the angles between the lower and connecting plates, and between the upper and connecting plates, are both A, where A is: 180° > A ≥ 90°. This invention tilts the necks and arranges them in a non-length direction, reducing mechanical tensile shear stress aging of the fuse necks under repeated current carrying capacity increases and decreases, thus improving the current carrying capacity.

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.

The invention discloses a resistance spot welding method for hot stamping forming steel and components thereof, which comprises the following steps: adopting pulse type resistance spot welding, and determining pulse current times n, a pulse current value I, pulse conduction time t and stop time S according to the carbon equivalent CE of a steel plate to be welded; when CE is smaller than or equal to 0.50, the pulse current frequency n is equal to 2; and when CE is greater than 0.50, the pulse current frequency n is equal to 3. According to the method, spot welding process parameters such as the electrode pressure P, the current pulse number n, the pulse current value I and the pulse current time t are determined based on the strength, the thickness and the carbon equivalent of the to-be-welded plate, the obtained joint is high in tension-shear strength and good in plasticity and presents a button failure mode, and the spot welding joint with excellent performance is obtained.

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.

The invention provides a bonding method of a polyurethane adhesive for organic glass. According to the method, polishing and cleaning, prime coat coating, bonding and curing conditions of a bonding base material are stipulated; meanwhile, the invention further provides a tensile shear strength sample of the polyurethane adhesive for the organic glass, the sample adopts a structure with a steel sheet bottom plate and a compensation cushion block, the test failure caused by the fact that the organic glass sample is damaged before the adhesive layer is damaged is prevented, and further, the tensile shear strength of the polyurethane adhesive for the organic glass is further improved. The loading force line and the center line of the sample are kept consistent through size design, so that the sample is only subjected to shearing force in the stretching process, and the test accuracy is improved; the method is suitable for gluing between the organic glass and the composite material, between the organic glass and the organic glass and preparation of a tensile shear strength sample of the polyurethane adhesive for the organic glass.

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.

The present invention discloses a fixture and method for testing the tensile shear creep of adhesives by a cross method, and belongs to the field of adhesive shear creep testing. The present invention uses a U-shaped first clamping plate with two J-shaped hook grooves at one end, and a rectangular second clamping plate with a J-shaped hook groove at one end to form a fixture, and effectively fixes the cross-cross specimen in the fixture. The present invention can fix the cross-cross specimen, use tensile load to perform shear creep testing, eliminate the rotation of the test piece caused by the traction of the adhesive layer, so as to more accurately measure the shear creep performance of the adhesive, and can be applied to test pieces with different adhesive layer thicknesses, without the need to prepare fixtures of different specifications, thereby reducing the test cost and improving the test efficiency.

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 invention belongs to the technical field of bridge engineering, and particularly relates to a shear key structure of a segmental beam and a construction method of the shear key structure. The shear key structure comprises transverse tensile groove units arranged on the end face of an inclined web, and a tensile shear key unit of which the two ends are arranged on the two transverse tensile groove units respectively and which is used for transversely connecting two segmental beams, and the lining steel plate unit is arranged on the transverse tensile groove unit and is used for clamping the tensile shear key unit. The shear key structure has the beneficial effects that the shear key structure at least has a transverse tensile effect on the basis of ensuring sufficient vertical support and shear resistance, so that the connection strength of the joint of the segmental beams is further improved, and the segmental beams are not easy to misplace and incline.

The present invention discloses a bearing and manufacturing integrated design method for an asymmetric variable-stiffness carbon fiber laminate. In view of the tensile-bending, tensile-shear, and bending-shear coupling deformation characteristics caused by the asymmetric layup in the present invention, during the material modeling process, the in-plane and out-of-plane coupling stiffness matrix is introduced to consider the influence of the above coupling effects. In addition, to effectively describe the influence of the change in the fiber direction within each ply of the variable-stiffness composite material, the local fiber angle of each ply is defined at the design points of the analysis model. In the analysis model, by calculating the material stiffness characteristics in the local area through various feasible interpolation methods for the material stiffness at the design points, the mechanical characteristics of the asymmetric variable-stiffness laminate can be effectively characterized.