78 results about "Shear strength" patented technology

Provided are a solder alloy, a solder paste, a solder ball, and a solder joint which have a low melting point, are excellent in ductility, shear strength, and heat cycle resistance, further suppress the occurrence of open defects, and in addition, have reduced residual voids even at the time of joining in a large area. A solder alloy has an alloy composition of, by mass %, Bi: 35.0 to 68.0%, Sb: 0.1 to 2.0%, Ni: 0.010 to 0.050%, Ge: 0.007 to 0.090%, with the balance being Sn. Preferably, the alloy composition further contains, by mass %, at least one of Co, Ti, Al, Mn, As, Fe, Pd, Zn, Zr, Pb, In, Ce, P, and Ga: 0.1% or less in total. Further, this solder alloy can be suitably used for solder pastes, solder balls, and solder joints.

The present application relates to the field of building, specifically to a composite panel-type tie member and a shear performance calculation method; comprising a steel core layer and outer cover layers located on both sides of the steel core layer to clamp and position the steel core layer; the outer cover layers are made of GFRP material, and the sizes of the two outer cover layers correspond; the size of the steel core layer is smaller than that of the outer cover layer, and the steel core layer and the outer cover layer have an equal proportion corresponding relationship; after the centers of the steel core layer and the outer cover layer are aligned, the gap area between the edges of the outer cover layers and the edges of the steel core layer is filled with bonding material. The tie member has high shear strength and stiffness, and effectively reduces the influence of wallboard thermal bridge effect.

The application discloses an automatic testing system for single-fiber interfacial shear strength, which comprises a single fiber with a resin drop, a clamp assembly for vertically fixing the single fiber and stretching the resin drop, and a testing system for detecting the single-fiber interfacial shear strength; the clamp assembly comprises a fixing frame for fixing two ends of the single fiber and movable along the direction of a single-fiber fixing shaft, and a pair of cutters located on both sides of the connection between the fiber and the resin drop; the testing system comprises a resin drop length acquisition module, a shearing force acquisition module, a motion control module and a calculation module. The application further provides an automatic testing method. The system provided by the application can effectively improve the detection accuracy and efficiency of the single-fiber interfacial shear strength.

The present invention provides a hot-rolled steel sheet for building structures, comprising a base layer, a corrosion-resistant layer, and an interfacial transition layer located between the base layer and the corrosion-resistant layer. The hot-rolled steel sheet of the present invention has a yield strength of ≥350 MPa, a tensile strength of ≥490 MPa, a yield-to-tensile ratio of 0.71 to 0.80, an impact energy of ≥190 J at -40°C, a corrosion resistance rate of ≤0.006 mm / year from sea spray, an interfacial transition layer thickness of ≤10 μm, and an interfacial shear strength of ≥252 MPa, and can be used to manufacture structural components suitable for sea spray environments. The present invention also provides a method for manufacturing the hot-rolled steel sheet.

The application discloses a tunnel deconstruction induced stress correction method and related equipment, and relates to the field of tunnel excavation, and mainly aims to solve the problem that the influence of induced stress of cracks in tunnels on tunnel excavation safety is still not considered when tunnels are excavated at present. The method comprises the following steps: obtaining the layer properties of the stress concentration area of the surrounding rock of a target tunnel, wherein the layer properties comprise tensile strength and shear strength; in the case that cracks exist in the stress concentration area of the surrounding rock, determining the induced stress of the stress concentration area of the surrounding rock based on target cracks, wherein the target cracks are cracks with crack opening greater than a preset opening; and determining the interference excavation degree of the stress concentration area of the surrounding rock based on the layer properties and the induced stress. The application is used for the correction process based on tunnel deconstruction induced stress.

The application discloses a brazing filler metal for titanium alloy and stainless steel connection and application thereof, and the brazing filler metal comprises an Ag-Cu eutectic brazing filler metal base and NiTi alloy particles. By introducing the NiTi alloy particles into the Ag-Cu eutectic brazing filler metal base, the Ni and Ti in the interface neighborhood are cooperatively involved in diffusion and reaction, the wetting and forming consistency of the brazing filler metal are cooperatively improved, the interface reaction layer is formed into a discrete thin layer, the continuous brittle reaction layer is inhibited from being generated, the risk of crack propagation along the interface is reduced, the shear strength of the brazing filler metal welding joint for titanium alloy and stainless steel connection is remarkably improved, and the forming quality and batch consistency of the brazing joint are improved.

This invention relates to the field of building engineering technology and discloses a post-cast strip support device and its construction method. The device includes bar-shaped reinforcing bars, with a reinforcing frame fitted onto the arc-shaped outer wall of each bar. A locking wire is fitted between the bar-shaped reinforcing bars and the reinforcing frame. The reinforcing frame is square-shaped, and four sets of bar-shaped reinforcing bars are provided, each set positioned at one of the four apex corners of the locking wire. A shaping mechanism is incorporated to create multiple sets of equilateral and inverted triangular structures between the two sets of reinforcing cages. This ensures the stability of the upper main bar, lower main bar one and lower main bar two, as well as the lower auxiliary bar, upper auxiliary bar one and upper auxiliary bar two, on the two sets of reinforcing cages after installation. This enhances the compressive strength of the post-cast strip structure after pouring and, to a certain extent, improves the holding force of the internal reinforcing structure on the concrete, ensuring the tensile and shear strength of the post-cast strip.

This provides a staggered wall structure that facilitates the shear strength of the panel material. [Solution] The structure is formed using a plurality of rectangular panel materials 20, each having a jaw portion V with a horizontal surface and a vertical surface formed by cutting out the corners. The panel materials 20 are arranged in a staggered pattern with spacing between them in the vertical and horizontal directions, and the corners of one panel material 20 that are joined together are positioned on the jaw portion V of the other panel material 20. Vertical loads are transmitted between the corner of one panel material 20 and the horizontal surface, and horizontal loads are transmitted between the corner of one panel material and the vertical surface.

The present application relates to the field of nondestructive testing, and provides a composite laminated sheet interlaminar damage identification and failure determination method, comprising: collecting acoustic emission signals of a composite laminated sheet in a short beam shear test, and extracting amplitude intensity and peak frequency; classifying and identifying damage categories in an interlaminar shear failure process; calculating a relative cumulative count of acoustic emission signals of each damage, and synchronously calculating a load change increment, and constructing a relationship curve of both and time; determining a damage starting time according to an initial change feature point of the relationship curve relative to the cumulative count curve, and cooperatively determining an interlaminar shear failure point in combination with a mutation feature of the load increment curve, and outputting a failure point load value as a limit load of interlaminar shear strength. The present application also provides a device, equipment and medium applying the method. The present application effectively identifies damage modes and determines an interlaminar shear failure starting point, and accurately determines a shear strength of a laminated sheet.

The application relates to a non-thermal effect decoupling method for electric pulse assisted diffusion bonding, and a special graphite mold is designed, the mold is divided into left and right parts, ceramic sheets such as zirconia are used for insulation on the contact surface of the left mold and the sample, so that no current passes through the left sample in the bonding process, and the right sample is normally powered, and through optimization design of the structure and size of the sample, the heating environment and temperature history of the left and right samples in the diffusion bonding process are ensured to be consistent. After the bonding is completed, the left and right regions in the same diffusion bonding joint obtained are sampled respectively, and microscopic tests are carried out; through comparison of the interface bonding rate and shear strength, interface structure evolution, element diffusion behavior and the like of the sample with current passing through and the sample without current passing through under the same thermal history, the non-thermal effect decoupling and extraction are realized. Compared with the prior art, the application provides an effective way for revealing the physical nature and action mechanism of the electric pulse in the diffusion bonding.

The application discloses a kind of V-shaped slope stability calculation method and system, it is related to strip mining technical field.Based on three-dimensional numerical simulation technology, determine its failure mode first determine the spatial form equation of potential sliding body, then the sliding body is divided into regional division micro column, through constitutive relation and static equilibrium condition, the stress state of micro column is solved, the force of each row micro column is superposed along the direction of main sliding surface, and the two-dimensional equivalent shear strength parameters with three-dimensional effect on each row of main sliding surface micro column are obtained using equivalent idea, then the three-dimensional V-shaped slope stability coefficient is derived using rigid body limit equilibrium method.The application avoids the problems of high calculation cost, difficult parameter determination and complex calculation process in the traditional three-dimensional slope stability calculation method, solves the three-dimensional stability problem of this special form slope, provides more reliable theory and technology for the design, mining, prevention and management of slope, and has important practical significance for ensuring mining safety and efficient production.

The application relates to the technical field of high-viscosity material dispersion equipment, and discloses a double-planetary dispersion feeder, which comprises a material bucket, the bottom of the material bucket is provided with a movable base, a support frame for stably supporting the material bucket is arranged between the bottom of the material bucket and the movable base, the upper part of the material bucket is provided with a bucket cover, the inside of the bucket cover is provided with a planetary gear box, and the planetary gear box is internally provided with a planetary gear transmission mechanism. In the process that the dispersion shaft performs composite motion, the internally arranged hydraulic telescopic rod can drive the telescopic inner rod to move up and down, so that the middle shear plate fixedly connected with the sliding block is lifted between the rough shear plate and the fine shear plate, the interval of the shear layer is dynamically adjusted, and the process rigidification problem caused by the fixed dispersion plate in the prior art is fundamentally solved. The equipment can dynamically adjust the interval of the shear plates in real time and on line according to different stages of material from wetting to fine dispersion, so that the shear strength required by different formulas and processes can be automatically matched.

This invention relates to a SCC mix design method and system based on the shear strength theory of cement paste. Its core lies in establishing a cement paste shear strength prediction model. This model quantitatively evaluates the shear strength of the cement paste under a proposed mix proportion and compares it with a pre-determined reasonable range. Then, through iterative adjustments to the cementitious material composition and water-cement ratio, the shear strength of the cement paste falls within the target range, thereby simultaneously optimizing the paste rheology and determining the final mix proportion. This invention achieves complete quantitative design from aggregate to paste, economically and efficiently preventing SCC segregation and maximizing the use of auxiliary cementitious materials to reduce the cost of self-compacting concrete.

The application provides a stress-controlled release type self-repairing composite material for a waterproof bonding layer of a bridge deck and a preparation method thereof, and belongs to the technical road engineering material and bridge deck paving field.The self-repairing composite material comprises a polymer modified asphalt base and a stress-controlled release type microcapsule, the stress-controlled release type microcapsule is prepared by a pH value gradient in-situ polymerization method on the surface of a capsule core to form a capsule wall, and then is modified by using a silane coupling agent to obtain the stress-controlled release type microcapsule, and the stress-controlled release type microcapsule has a capsule wall integrity rate of greater than or equal to 90% and a core material retention rate of greater than or equal to 85% under asphalt mixing conditions at 170 DEG C.The self-repairing composite material has excellent high-temperature mixing stability, stress triggering response characteristics and self-repairing functions, the interlayer pull strength and shear strength recovery rate after repair are greater than or equal to 70%, the water permeability coefficient reduction rate is greater than or equal to 80%, the durability and service life of the bridge deck paving system are significantly improved, and the whole cycle maintenance cost is reduced.

This invention discloses an ultrathin plywood with thermo-mechanical modification, its manufacturing method, and apparatus. By introducing CNTs / Cu binary micro / nano fillers, the modification effect of carbon nanotubes (CNTs) on the thermoplastic resin matrix is ​​utilized to improve the interlayer shear strength, fracture toughness, and in-layer thermal conductivity of the ultrathin plywood (FMLs). Different contents and sizes of granular Cu powder fillers act as anchors between different plies, forming thermally conductive microchannels, thus improving both the interlayer shear properties and the thickness-based thermal conductivity of the ultrathin plywood (FMLs). Segmented heating and ultrasonic vibration-assisted hot pressing of the FMLs laminations simultaneously achieve synergistic modification of the interlayer interfacial mechanical and thermal properties during the preparation of the ultrathin plywood (FMLs) material. This effectively solves the problem of weak interlayer bonding and poor thickness-based thermal conductivity in ultrathin plywood (FMLs), which restricts its application range and serviceability, and enhances the structural and functional designability of components for specific service environments.

This invention belongs to the field of electrical equipment technology and discloses an anti-theft metering box with a hinge-side shear pin anti-pry mechanism. The anti-theft metering box includes a cabinet assembly, in which a meter is connected. The cabinet assembly includes a housing with an open-end storage cavity. The meter is located within the storage cavity. A cabinet door is rotatably mounted on one end of the housing, capable of closing the storage cavity. The core anti-pry function is achieved through the linkage of the hinge assembly and a triggering assembly. The pin vertically penetrates the hinge fixing part and the housing, with a preset shear strength acting as a mechanical fuse. When the cabinet door is subjected to prying, impact, or other external forces exceeding a threshold, the pin breaks first, preventing deformation of the cabinet and hinge. Simultaneously, the transmission end identifies the pin's status in real time and wirelessly transmits abnormal information to a remote terminal, alerting staff to promptly investigate electricity theft or equipment damage.

The utility model discloses an assembled concrete pouring floor slab, concretely relates to the technical field of assembled building, including two concrete floors, the upper surface of two concrete floors is provided with a plurality of reinforcement placing positions, a plurality of reinforcement placing positions are symmetrically distributed with the upper surface of concrete floor, and the connecting assembly is installed between two concrete floors, and the inside installation of concrete floor has the reinforcing mechanism, the connecting assembly includes the connecting plate, and the connecting plate sets up between two concrete floors. The utility model discloses through setting up connecting assembly and reinforcing mechanism, can provide effective accurate positioning for concrete floor installation, so as to be convenient for being able to quickly complete the splicing of two concrete floors, reduces the time of manual repeated adjustment, helps to improve construction efficiency, can enhance the shear strength and torsional property of concrete floor simultaneously, can reduce the deflection deformation of concrete floor under the action of load, thereby improve the structural stability.

This invention relates to coil components that improve the bonding strength between the core and the top plate. The surface roughness of the top surface (9, 10) of the flange portion of the core is different from the surface roughness of the lower main surface (15) of the top plate (14). For example, the surface roughness of the lower main surface (15) of the top plate (14) is less than the surface roughness of the top surface (9, 10) of the flange portion of the core. A protrusion (21) protruding from the lower main surface of the top plate with the smaller surface roughness and contacting the top surface of the flange portion of the core is provided in the area where the lower main surface of the top plate and the top surface of the flange portion of the core face each other, separated by an adhesive. The protrusion increases the surface area of ​​the bonding surface of the top plate with the smaller surface roughness and provides an anchoring effect of the adhesive relative to the top plate. Furthermore, since the protrusion itself is held in place, the shear strength in the extending direction of the opposing surfaces of the top plate and the core is improved.

This invention provides a method and system for predicting the shear strength of a structural surface under non-uniformly distributed loads, belonging to the field of rock mechanics. The method includes: acquiring the surface roughness parameters of the target structural surface and determining the distribution of the non-uniformly distributed normal loads acting on the structural surface and the magnitude of the average normal stress; establishing a shear analysis model of the structural surface and obtaining shear response data of the structural surface under non-uniformly distributed normal loads; determining the peak shear strength and residual shear strength of the structural surface; constructing a shear strength prediction model of the structural surface and outputting the predicted shear strength results of the structural surface based on the shear strength prediction model. This invention achieves a unified characterization of the actual stress state of the structural surface and a highly consistent prediction of shear strength by simultaneously introducing the surface roughness characteristics and the non-uniformly distributed normal load mechanism during the shear strength prediction process.

The utility model discloses a kind of split type conical double-screw extrusion tablet press, it is related to extrusion tablet press technical field, including base, the base is provided with two, and two base top portion is fixedly connected with main fixed cylinder and auxiliary fixed cylinder respectively;The auxiliary fixed cylinder top is detachably connected with dismounting cylinder by bolt, and the cavity formed by main fixed cylinder, auxiliary fixed cylinder and dismounting cylinder is rotatably connected with two screw rods inside, the screw rod is segmented structure, and each screw rod section end is fixedly connected with connecting block. This kind of split type conical double-screw extrusion tablet press, screw rod is connected by connecting block plug-in connection and is composed of multiple segmented screw rod section, it is convenient to dismount and replace, and the thread density and structure parameter of different segment screw rod can be designed or replaced according to material requirement, realize the regulation and control of compression ratio and shear strength, satisfy the individualized requirement of various material plasticizing and compression process, improve equipment application range and processing effect.

This invention discloses a method for constructing a composite structure of a crushed stone softened base course pavement based on finite element modeling. The method includes: dividing the waste semi-rigid base course pavement structure into a loose layer and a crushed stone softened layer, and determining the shear strength components of each layer; the crushed stone softened layer includes a crushed stone layer and a cracked layer; comparing and analyzing the main mechanical control indicators of each pavement structure based on finite element modeling to determine the optimal location of the crushed stone layer; conducting orthogonal experiments on inverted and composite base course pavement composite structures to calculate the influence of various factors on the pavement composite structure and identify key factors; setting the parameter variation range of the pavement structure based on the key factors, calculating various mechanical control indicators under different parameter combinations, and determining the optimal thickness and optimal modulus of the loose layer and cracked layer. This invention can complete the optimized construction of a crushed stone base course pavement composite structure, providing guidance for the entire process of quantifying the characteristics of the crushed stone softened layer and accurately designing the parameters of the overlay structure.

A rigid, foldable sheet metal cargo bed cover with certain exemplary properties is provided. The sheet metal has a yield strength greater than its shear strength. The sheet metal may be a manganese-alloyed aluminum alloy. The cargo bed cover further comprises cover panels, each with C-shaped longitudinal and transverse edges. The cargo bed cover may also include a C-shaped profile that fits the C-shaped edges of the cover panels, so that the cover frame is configured to receive the cover panels. The cargo bed cover may further include one or more crossbeams with a T-slot profile configured to receive latches.

This invention discloses a method, system, and medium for real-time prediction of the response of a single pile in spatially variable clay. The method includes: establishing a stochastic finite element model of the pile foundation and characterizing the spatial variability of the undrained shear strength of marine clay to generate a pile response dataset. The pile response data in the dataset includes the pile's lateral deflection, rotation angle, bending moment, and shear force. Four depth operator network models are constructed and trained based on the pile response dataset. The trained depth operator network models are then used to predict the lateral deflection, rotation angle, bending moment, and shear force of the pile in real time. This invention overcomes the bottleneck of low computational efficiency in existing stochastic finite element models, constructs an efficient prediction model, and enables rapid and accurate prediction of the single pile response.

A hard folding cargo bed cover is provided that is formed from a metal sheet having certain exemplary characteristics. The metal sheet has a yield strength that is greater than a shear strength. The metal sheet can be aluminum alloyed with manganese. The cargo bed cover also includes cargo bed cover panels, each having C-shaped longitudinal and lateral edges. The cargo bed cover can also include a C-shaped profile that matches the C-shaped edges of the cargo bed cover panels such that the cargo bed cover frame is configured to house the cargo bed cover panels. The cargo bed cover can also include one or more cross-braces having a T-shaped slot configured to house a latch.

This invention discloses a laser cladding repair method for interface damage in titanium-steel composite plates based on a copper interlayer, belonging to the field of metal material remanufacturing. It constructs an evaluation system based on the sufficiency of copper-steel interface fusion, copper layer remelting rate, and interface residual stress. The optimal process window is determined using multi-layer dissimilar material multi-physics coupled finite element simulation to guide the repair. The process parameters for the copper interlayer are: laser power 2400-2800W, spot diameter 3.8-4.2mm, and scanning speed 400-500mm / min; the process parameters for the titanium filler layer are: laser power 1100-1300W, spot diameter 1.6-2.0mm, and scanning speed 700-750mm / min. This process blocks excessive diffusion of Fe-Ti elements, avoids the formation of brittle intermetallic compounds, and results in a dense interface structure with a shear strength of 270MPa, superior to the original titanium-steel composite plate shear strength and related standards.

This utility model relates to the field of bridge construction technology in water conservancy engineering, and discloses a hollow precast slab for a river sluice gate traffic bridge. It includes an upper slab with a support mechanism fixedly connected internally. Multiple ribs are fixedly connected to the bottom of the upper slab, and an assembly mechanism is fixedly connected to the bottom of each rib. The assembly mechanism includes a lower slab, the top of which is fixedly connected to the bottom of the ribs. Multiple protrusions are fixedly connected to one side of the lower slab, and multiple grooves are formed on the other side. Two sealing strips are fixedly connected to the opposite sides of two ribs. In this utility model, the protrusions and grooves are precisely engaged through a mortise and tenon joint, and then concrete is filled at the joint. The adhesive force of the concrete, combined with the mechanical interlocking force of the mortise and tenon structure, tightly bonds the slab into a whole, improving the shear strength of the joint.

This invention discloses a method for determining the rock failure surface during drilling, comprising the following steps: 1) simulating and determining the drilling force model, and determining the relationship between the components in the model; 2) calculating the maximum shear stress at which the rock structure undergoes plastic failure; 3) determining the shape of the failure surface and the maximum shear stress τ in the shear zone determined in step 2) according to the maximum shear stress criterion. max This is related to predicting the failure surface; 4) Based on the maximum shear stress criterion, the iterative method is used to solve the force acting on the cutting surface, and the function of the failure surface is determined by inputting the basic drilling parameters, quantitatively presenting the failure surface morphology. The method of this invention introduces the Michel solution of elastoplastic mechanics to solve the stress state of the rock shear zone during drilling, and derives a specific response function of rock properties to drilling parameters based on the stress characteristics of the drill bit; referring to the maximum shear stress criterion, the shear stress of the unit body is compared with the shear strength of the rock to determine whether the rock is broken.

The present application relates to a kind of for large size (>400mm 2 ) welding sample push-pull force test fixture and test method. Since the direct heat dissipation structure is welded with heat sink using DBC (Direct Bonded Copper) substrate, the sample after welding needs high mechanical reliability, so it needs to test its shear strength and push-pull force fatigue reliability. The existing push-pull force test equipment is mostly used for chip samples, and the upper limit of push-pull force is usually less than 2,000N, while the push-pull force requirement of DBC sample is usually more than 8,000N, and the existing equipment cannot meet the requirements. The present application designs a push-pull force test fixture suitable for large size samples, which consists of a limiting cover plate, a push head, a base and a sample fixing clamp, which can effectively stabilize the sample and ensure uniform stress. In addition, the present application also proposes a method for optimizing test precision to ensure the reliability of test results. The fixture and method can meet the push-pull force test requirements of large size welding samples and promote the development of electronic packaging technology.