46 results about "Shear band" patented technology

The invention relates to the technical field of metal plate rolling processing, and discloses a rolling strengthening method capable of reducing the rigidity of a metal plate, which comprises the following steps: applying an asymmetric rolling condition to an initial plate to enable the plate to generate a speed gradient in the thickness direction; the plate is subjected to one-pass large-rolling-reduction rolling, and a non-continuously-distributed shear band is formed; the rolled plate is heated to the dynamic recrystallization temperature interval of the plate, and multi-pass small-rolling-reduction warm rolling is conducted on the plate; and in the warm rolling process, dynamic recrystallization of a shear band is promoted to form a grain-refined continuous core layer, complete recrystallization of the surface structure of the plate is inhibited to keep the work hardening state of the plate, and therefore the metal plate with the rigidity lower than that of an initial plate is obtained. According to the invention, a soft core-hard shell heterostructure is constructed in the plate, high strength and low macroscopic rigidity are synergistically realized, the process controllability is strong, and the method is suitable for preparation of high-performance structural materials.

The invention discloses a large-scale visualized direct shear test device and method for geosynthetics. The device comprises a main frame, an upper shear box, a lower shear box, a normal cyclic loading system, a horizontal cyclic shear loading system, a data acquisition system and a visualized monitoring system. The direct shear test device is characterized in that the direct shear test device can perform normal and horizontal cyclic loading at the same time, and normal stress with different frequencies and amplitudes can be applied according to needs to simulate a test of the characteristics of the reinforcement-soil interface under the cyclic loading effect; one side wall of the upper shear box and one side wall of the lower shear box are transparent observation windows, and a high-speed camera and a digital image analysis method are combined, so that the shear band evolution process can be visually observed and quantitatively analyzed; the shear box is large in size, and the size effect is effectively overcome. According to the invention, the interface characteristics under the cyclic load effect in the road engineering can be reflected more truly and comprehensively, the size and the function of the shear box are comprehensive, and the interface mechanical characteristics and the interaction mechanism under various working conditions can be simulated.

The invention discloses a hierarchical collaborative anchoring prevention and control method for a hidden down-dip rock slope, and relates to the technical field of hierarchical collaborative anchoring prevention and control for the hidden down-dip rock slope, and the method comprises the following steps: obtaining geological survey data of a target slope, and generating a slope digital model composed of a plurality of grid nodes; and performing strength reduction on the slope digital model, simulating a process of evolving the target slope from a steady state to an unsteady state, obtaining data of each grid node in the simulation process, calculating a shear strain value of each grid node, and generating initial slope stress field data. According to the method, the dynamic evolution path of the shear band is accurately tracked through strength reduction simulation and space-time sequence reconstruction, and shear evolution characteristics can be accurately identified, so that dislocation of a reinforcement position and an actual disaster-causing region is effectively avoided, reinforcement failure caused by shear failure of a side slope is effectively avoided, and the prevention and control effect is effectively improved.

The invention discloses a tunnel secondary lining concrete damage mechanical test method which comprises the following steps: step 1, preparing a tunnel secondary lining crack concrete test piece, and arranging one or more compressible units in the tunnel secondary lining crack concrete test piece; step 2, arranging a plurality of initial marking points on the side surface of the tunnel secondary lining crack concrete test piece; step 3, obtaining an initial coordinate value of each initial mark point in the corresponding coordinate system; 4, erecting an image device in front of the to-be-monitored side surface; step 5, applying an external force downwards to the upper end of the tunnel secondary lining crack concrete test piece, and in the process of applying the external force, continuously photographing the to-be-monitored side surface by the image device to obtain a plurality of initial mark point change images; step 6, determining displacement change and direction change of the initial mark point between any two moments, and establishing a displacement field; and step 7, determining the position of the shear band. By adopting the method, the real strength parameters of the tunnel secondary lining concrete containing the damaged interlayer can be provided.

A soft magnetic steel wire rod is provided, which comprises, in weight%, 0.0001 to 0.0300% of C, 0.001 to 3.000% of Si, 0.001 to 0.500% of Mn, 0.001 to 0.100% of Al, 0.0001 to 0.0100% of P, 0.0001 to 0.0100% of S, 0.0001 to 0.0100% of N, and the remainder being Fe and other inevitable impurities, wherein, after the soft magnetic steel wire rod is drawn at room temperature at a reduction ratio of 59% to 93%, the number density of shear bands of the steel wire is 11.4 / mm2 or more.

The present invention relates to an airless tire (1) for extraterrestrial vehicles, the airless tire (1) comprising a tread made of three-dimensional fabric for vehicles capable of traveling on various types of surfaces at very low temperatures in extraterrestrial environments. This airless tire includes, radially from the inside to the outside, a support structure (2), a shear band (3), and a tread (4), the support structure (2) being designed to mate with a rim. According to the invention, the material used to manufacture the tread (4) has a tensile Young's modulus E of at least 1 GPa and at most 6 GPa measured at a temperature equal to 20°C and a tensile Young's modulus E of at least 1.2 GPa and at most 9 GPa measured at a temperature equal to -196°C, and a maximum tensile stress Sm of at least 25 MPa and at most 150 MPa measured at a temperature equal to 20°C and a maximum tensile stress Sm of at least 40 MPa and at most 260 MPa measured at a temperature equal to -196°C. These mechanical properties are measured according to standard ASTM D638, and the tread (4) is made solely of three-dimensional fabric (T).

This invention relates to an intelligent flow sensing method and system for cold-pressing amorphous alloy powder, belonging to the field of flow measurement technology. The method includes constructing an acoustic emission feature vector; inputting the original capacitance measurement tensor and acoustic emission feature vector into a capacitance tomography reconstruction algorithm to construct a multi-frequency dielectric-mechanical coupled Gaussian mixture model; performing soft classification decoupling on the dielectric constant distribution matrix to generate a shear band density field and a porosity distribution field; introducing the shear band density field to perform free volume correction on the powder's apparent density distribution field, and solving to obtain a real-time flow characteristic scalar; inputting this time-series graph structure data into a graph neural network-long short-term memory coupled model; comparing the shear band network connectivity with a threshold in real time; and constructing a multi-objective cost function to achieve coordinated control of high-precision flow tracking and active suppression of shear band instability during cold pressing. This invention improves the flow sensing accuracy, instability early warning timeliness, and process control coordination of cold-pressing amorphous alloy powder.

The invention discloses aluminum-based metal glass and a treatment method thereof. The treatment method comprises the following steps: obtaining a target aluminum-based amorphous alloy bar; determining an elastic loading force according to the breaking strength of the target aluminum-based amorphous alloy bar; according to the elastic loading force, axial elastic loading treatment is conducted on the target aluminum-based amorphous alloy bar, external energy is introduced into the aluminum-based amorphous alloy bar through the axial elastic loading treatment, the energy state of the aluminum-based metal glass is improved, and therefore the young aluminum-based metal glass can be obtained. In the process, more free volume / flow units are introduced into the metallic glass, so that the metallic glass is converted to a state close to a supercooled liquid structure, and a large number of shear bands are generated in the deformation process, so that the mechanical property of the aluminum-based metallic glass is remarkably improved, the brittleness of the aluminum-based metallic glass is improved, and the comprehensive mechanical property of the aluminum-based metallic glass is improved. And the method is easy to operate, a high-performance solution is provided for the lightweight fields of ships, aerospace and the like, and unification of excellent performance and industrial application is achieved.

The invention provides a high-thermal-conductivity polyethylene pipe master batch and a preparation method thereof. The master batch comprises polyethylene powder particles, a copolymer elastomer, surface-modified graphene, multi-walled carbon nanotubes and a processing aid. The raw materials are blended in two steps by adopting a solution-melting method, so that the heat-conducting filler is selectively and uniformly dispersed in a polyethylene matrix, and the percolation threshold value is effectively reduced. The two heat-conducting fillers with different shapes are compounded for use, so that a three-dimensional, efficient and stable heat-conducting network can be constructed, and rapid transportation of heat in the three-dimensional direction is realized. The copolymer elastomer is used as a stress concentration point to initiate crazing and a shear band, so that a large amount of impact energy is absorbed, and the effect of toughening polyethylene is achieved.

A non-oriented electrical steel sheet according to an embodiment of the present invention contains, by wt%, 1.5 to 5.0% Si, 0.1 to 2.0% Al and 0.1 to 2.0% Mn, with the balance being Fe and inevitable impurities. In a cross section that includes the rolling direction and the thickness direction of the steel sheet, in the central portion going from 1 / 4 to 3 / 4 of the total thickness of the steel sheet, the angle between {113}<110> and the shear band in the rolling direction of the steel sheet is 25 to 55°.

The invention relates to the technical field of slip band soil sample treatment, in particular to an optical fiber-based soil shear band three-dimensional shape intelligent detection device, which comprises an intelligent direct shear box and an automatic insertion mechanical arm, the intelligent direct shear box is composed of an upper box and a lower box, and the upper box is connected with a linear ball guide rail of the lower box through a ball slide block to form a sample forming area; a bottom plate of the lower box is an intelligent bottom plate, and embedded follow-up light source modules are arranged on the intelligent bottom plate in a matrix mode. The automatic inserting mechanical arm is installed on the upper edge of the side wall of the upper box and comprises a linear motor module, an electric cylinder and a multifunctional end effector, and the multifunctional end effector is integrated with a double-station rotating clamping jaw and a laser ranging probe. The light source module is pre-embedded in the bottom plate of the lower box and forms stable physical light path connection with the optical fiber inserted into the upper box before the test, so that the continuity and stability of optical signal transmission in the whole shearing stroke are ensured, and the three-dimensional fine structure of the slip band in the whole shearing failure process of the slip band soil can be dynamically and visually observed.

The invention discloses a landslide shear outlet slip zone in-situ shear rheometer and a test method thereof.The landslide shear outlet slip zone in-situ shear rheometer comprises a transparent shear box, a load applying assembly, a monitoring assembly and a control terminal, and the transparent shear box comprises an upper box body and a lower box body; the load applying assembly comprises a vertical loading unit, a vertical counter-force unit, a plurality of adjustable supporting frames, a horizontal loading unit and a horizontal counter-force unit, the vertical loading unit applies a vertical load to the transparent shear box, and the vertical counter-force unit is arranged on the adjustable supporting frames and applies resistance of the vertical load to the transparent shear box; the height and the inclination angle of the adjustable support frame are adjustable, the horizontal loading unit applies a horizontal load to the upper box body, and the horizontal counter-force unit applies a horizontal counter-force to the lower box body; the monitoring assembly comprises a first displacement sensor, a second displacement sensor, a plurality of bending element probes and a camera; the control terminal is electrically connected with the load applying assembly and the monitoring assembly; and the evolutionary process of the macroscopic stress-strain response and the microstructure in the slip band shearing process can be obtained.

The application relates to a copper target material deformation heat treatment process suitable for continuous production, characterized in that copper plates are continuously put into a -50 DEG C low-temperature holding box in sequence, the copper plates are quickly sent into a rolling mill for deep low-temperature rolling after the temperature of the copper plates is reduced to -50 DEG C, the above-mentioned temperature reduction and rolling multi-pass processes are repeated, and the total deformation of the copper plates reaches 80%; the application is suitable for industrialized continuous and rapid production, high production efficiency is obtained, the obtained target material has good uniformity and good fine-grain effect; through composite deformation, grains are broken, and then a targeted annealing process is formulated to make high-purity copper recrystallize, eliminate shear bands and coarse grains in a single deformation such as rolling, the process cost is moderate, a complex mold is not needed, and the process is a good high-purity copper target material fine-grain and structure optimization process scheme.

A shear band that may be used e.g., in a non-pneumatic tire is provided. The shear band uses interlaced reinforcing elements positioned within a shear layer of elastomeric material. A variety of configurations may be used to create the interlaced positioning of the reinforcing elements including e.g., a horizontal diamond or vertical diamond configuration. The shear layer formed from a rubber composition having a very low hysteresis reinforced with silica and carbon black and one or more anti-reversion chemical selected from 1,3 bis((3-methyl-2,5-dioxopyrrol-1-yl)methyl)benzene (CAS No.: 119462-56-5) and hexamethylene 1,6-bis(thiosulphate), disodium salt, dihydrate (CAS No.: 5719-73-3).

The invention discloses a polymer dispersed liquid crystal membrane capable of improving toughness and resisting finger imprint, a coating composition and a preparation method of the polymer dispersed liquid crystal membrane, and belongs to the technical field of polymer composite materials and PDLC (Polymer Dispersed Liquid Crystal). A polymer matrix of the PDLC film is a three-dimensional cross-linked network, a reactive flexibilizer is combined with the polymer matrix through a covalent bond, the reactive flexibilizer is a first polyurethane acrylate oligomer containing an acrylate functional group at the tail end, the number-average molecular weight is 1500-10000, and the functionality is 2-10. In the curing process, the reactive flexibilizer is anchored to a polymer network through a covalent bond, and due to thermodynamic incompatibility of a flexible chain segment of the reactive flexibilizer and an acrylate monomer, spontaneous phase separation is carried out to form a nano-scale flexible microcell of 50-500 nm, and a microcosmic phase separation structure is constructed. When the PDLC film is subjected to local pressure, the structure can synergistically dissipate energy by inducing crazing, a shear band, large deformation, crack pinning and other mechanisms, so that the toughness and the finger imprint resistance of the film layer are remarkably improved.

The invention relates to the technical field of energy absorption materials and impact protection, and particularly discloses a controllable energy absorption design system and method.The controllable energy absorption design system comprises a function control module and a core structure assembly, and the function control module comprises a numerical simulation module, a material performance testing module and a technological parameter control module; the core structure assembly further comprises a gradient foamed aluminum core body, a multi-stage triggering mechanism and a self-adaptive shell. Through continuous change of the gradient foamed aluminum core body and the porosity in the impact force direction and through precise analysis of a numerical simulation module on mechanical behaviors, sequential collapse of a material is guided, and formation of a local shear band is inhibited; the micro-groove array of the self-adaptive shell enhances lateral constraint, and stress mutation caused by uneven deformation is avoided. Finally, the foamed aluminum is uniformly stressed during energy absorption, the stress fluctuation is reduced, the energy absorption efficiency is improved, the secondary damage risk is reduced, and the stability and protection safety of the energy absorption structure are remarkably optimized.

The present application relates to the field of applying stable shear force to test the strength characteristics of solid materials, in particular to a shear band temperature testing device for soil shearing process and a method for using the same. The shear band temperature testing device for soil shearing process comprises a shear box (1), characterized in that it further comprises a temperature sensor, a pore water pressure gauge (31), a metal filter screen (32) and a data acquisition instrument (4), the shear box (1) comprises an outer box (11), an inner box (12), an upper disc (13), a lower disc (14), an upper disc screw (15), a lower disc screw (16), an interstitial water pressure tank (17) for visualization container, an inner box fixing screw (18) and a counterforce shaft assembly. The method for using the shear band temperature testing device for soil shearing process is characterized in that the following steps are sequentially implemented: i. setting; ii. shearing; iii. collecting. The present application has high precision measurement.

The invention discloses a low-cost high-tungsten-high-entropy alloy armor-piercing bullet core material, the chemical formula is Wx. (HEA) y, x and y respectively correspond to molar percentage values of W and HEA, and x: y = (1.5-9): 1; the preparation method comprises the following steps: 1, carrying out suspension smelting and vacuum gas atomization to obtain high-entropy alloy spherical powder; 2, mixing with tungsten powder to obtain mixed powder; 3, performing cold isostatic pressing to form a compact green body after pre-pressing molding; 4, performing pressureless sintering to obtain a compact sintered body; and 5, solid solution and rotary swaging treatment. The ratio of tungsten to the high-entropy alloy is controlled to control the formation of a hot shear zone, and the armor-piercing shell core material with high penetration capacity is obtained; based on powder mixing, cold isostatic pressing, pressureless sintering and solid solution and rotary swaging treatment processes, densification and strengthening of the material are achieved step by step, the high-tungsten armor-piercing bullet core material with high density and uniform component tissue is obtained, the comprehensive performance is improved, and the high-tungsten armor-piercing bullet core material is suitable for batch production.

The application discloses a simulation method for improving plasticity of amorphous alloy under compression, which comprises the following steps: constructing an initial model of amorphous CoMn alloy; cooling to 300K at cooling rates of 10 10 , 10 11 , 10 12 and 10 13 K / s respectively under zero pressure to obtain four amorphous models; periodically replicating and extending the four amorphous models along the X axis by four times to obtain four compression models; setting the compression models as periodic boundary conditions in the X and Y directions and as free boundary in the Z direction; uniaxially compressing the four compression models along the X direction at a strain rate of 1x10 8 s ‑1 to obtain thermodynamic information; and analyzing the influence of nanocluster structure evolution formed by atomic condensation on the mechanical properties of the amorphous alloy. The application solves technical problems that atomic scale microstructure deformation process in a deformation process of MGs is difficult to obtain in experiments, simulates a formation process of a shear band of amorphous material and a microstructure mechanism and the like.

The invention relates to the technical field of dynamic mechanical testing, in particular to a dynamic shear deformation freezing and measuring system and method for a monopulse torsion bar, and the system comprises a torsion bar system, a monopulse loading mechanism and a measuring system. The torsion bar system comprises an incident bar and a transmission bar and is used for conducting torsion stress waves and clamping the thin-wall tubular sample; the single pulse loading mechanism absorbs reflected wave energy through cooperation of a wave unloading rod and a one-way coupler, single pulse loading is achieved, and secondary loading is avoided. The movable buckle is arranged on the incident rod and used for accurately adjusting the loading pulse width, and the movable buckle is matched with the one-way couplers and the wave unloading rods on the incident rod and the transmission rod to achieve single-pulse loading control, so that the loading pulse width can be accurately adjusted in the form of a frozen sample after loading. And the thermal-mechanical coupling data in the loading process is synchronously obtained by using the infrared transient temperature measurement detector and the strain rosette, so that a high-precision experimental means is provided for deeply researching the shear band formation, damage evolution and thermoplastic instability mechanism of the material under the high-strain-rate shear load.

The invention discloses a high-corrosion-resistance aluminum alloy with a micro-shear band penetrating type structure and a preparation method and application of the high-corrosion-resistance aluminum alloy, and belongs to the technical field of aluminum alloy material machining. Through high-strain asymmetric rolling and specific aging compound treatment, a penetrating type micro shear belt structure is successfully constructed in the 7xxx series aluminum alloy, the internal small-angle grain boundary proportion of the 7xxx series aluminum alloy is larger than or equal to 60%, the alloy intergranular corrosion depth is smaller than or equal to 38 micrometers, the tensile strength is larger than or equal to 440 MPa, and the corrosion resistance and the mechanical property can be synchronously improved. According to the scheme, the experimental design is simple and easy to implement, dependence on expensive and rare alloy components is not needed, the production cost can be remarkably lowered, alloy recycling and regeneration can be facilitated, the resource utilization efficiency is improved, native resource consumption is reduced, the core requirement for low-cost and high-environment-friendly materials in the industrial profile field with the distinct cost performance guiding is perfectly met, and the method is suitable for popularization and application. And the method has important industrial application value and is suitable for key force-bearing components such as aerospace and the like.

The invention provides a high-impact-resistance and high-thermal-conductivity polyolefin composite floor heating pipe and a preparation method thereof. The floor heating pipe is prepared from the following raw materials: 100 parts of polyolefin, 5 to 15 parts of thermal conductive filler, 10 to 40 parts of elastomer, 1 to 1.5 parts of dispersing agent and 0.5 to 1.5 parts of lubricating agent. The heat-conducting filler is adopted for surface modification, meanwhile, an elastomer phase with good compatibility with polyolefin is introduced, it is guaranteed that the heat-conducting filler is selectively and evenly dispersed on a two-phase interface, and the percolation threshold value is effectively reduced. The heat conduction filler constructs a three-dimensional, efficient and stable heat conduction network, and rapid transportation of heat is achieved. And the copolymer elastomer is used as a stress concentration point to initiate crazing and a shear band, so that a large amount of impact energy is absorbed, and the impact resistance of the polyolefin composite pipe is improved.

This invention discloses a PVC conduit and its preparation method, belonging to the field of polymer materials technology. By incorporating functionalized grafted elastomers, this invention significantly improves toughness while effectively inducing numerous crazing and shear bands in the matrix at low temperatures, absorbing impact energy and thus significantly improving the brittle fracture problem of PVC-U pipes under low-temperature conditions. Furthermore, the modified functional filler not only significantly improves the compatibility with PVC resin and elastomers, but also utilizes needle-like nano-hydroxyapatite combined with silicon carbide to form a stable three-dimensional network structure in the system, further hindering the intrusion of oxygen and heat, thereby delaying material aging. Due to the overlapping effect of needle-like hydroxyapatite and the rigidity point effect of silicon carbide, it significantly strengthens the PVC matrix, thereby improving the overall performance of the PVC conduit, achieving a balance between rigidity and toughness, and possessing higher application value.

According to the multi-feature bionic and multi-material heterogeneous fusion honeycomb structure provided by the invention, a soft-phase circular ring structure imitating vegetable sponge fibers and a hard-phase double-diagonal structure imitating deep-sea glass sponge are integrated; a reverse material-structure matching strategy of printing a soft-phase structure with a hard material and printing a hard-phase structure with a soft material is adopted, and the complementary advantages of different structures and materials are fully played: a soft-phase circular ring structure is used as a main force transmission framework, and the initial peak force is effectively reduced and initial deformation is resisted by utilizing the characteristic of low initial modulus of the soft-phase circular ring structure; the hard-phase double-diagonal structure effectively inhibits the expansion of a shear band by using a unique topological structure, and realizes stable bearing under a high stress level. Compared with a traditional honeycomb structure of a single material or a single structure, the honeycomb structure has the advantages that the overall energy absorption capacity and platform stress are remarkably improved while the light weight is kept, and cooperative reinforcement of comprehensive mechanical properties of high strength, high energy absorption, low peak force and stable deformation is achieved.

The invention discloses a method for testing shear expansion and shear zone evolution of sandy soil, which comprises the following steps of: performing mesoscopic real-time dynamic scanning on a triaxial drainage shearing process of a sandy soil sample by utilizing a CT (Computed Tomography) machine and a triaxial apparatus, and observing the microstructure evolution characteristics of the sandy soil sample to obtain a CT scanning image of a vertical section of the sample; and analyzing the volume change of the sandy soil sample in the triaxial shearing process and the generation and development process of a shearing band. And in combination with the change of the CT value and a screening test, the crushing mechanism of the granular soil and the mixture thereof is analyzed. Research results are expected to provide microstructure test data and theoretical analysis basis for further understanding of a granular soil strength forming mechanism, a shear band forming rule and particle crushing characteristics.

The invention belongs to the technical field of coating compositions, and particularly relates to an anti-cracking thermoplastic resin coating as well as a preparation method and application thereof. The anti-cracking thermoplastic resin coating is prepared from the following raw materials in parts by weight: 88-95 parts of thermoplastic resin, 0.1-2 parts of an antioxidant, 0.1-2 parts of a light stabilizer, 2-8 parts of modified short fiber aluminum silicate, 2-5 parts of an ethylene-vinyl acetate copolymer and 0-2 parts of toner. Modified short-fiber aluminum silicate is used as an anti-cracking agent, the interface bonding force and the structural stability of thermoplastic resin are improved by utilizing a dual interface optimization mechanism of surface activation and interface coupling, and meanwhile, a synergistic system of rigid crack resistance and flexible toughening is formed by cooperating with the toughening effect of ethylene-vinyl acetate copolymer and utilizing a crazing-shear band mechanism, so that the anti-cracking performance of the thermoplastic resin is improved. The anti-cracking performance of the thermoplastic resin coating is improved.

The invention relates to a base membrane and a preparation method and application thereof. The base film comprises a core layer, a first surface layer and a second surface layer, wherein the first surface layer and the second surface layer are located on two opposite surfaces of the core layer respectively. The materials of the core layer, the first surface layer and the second surface layer respectively and independently comprise matrix resin and a buffer material, the mass percent of the buffer material in the core layer is greater than the mass percent of the buffer material in any one of the first surface layer and the second surface layer, and the buffer material is a high polymer material with elastic recovery performance. The buffer material with elastic recovery performance in the base film is used as a stress dispersion point to promote the film to form more uniformly distributed crazes and shear bands in a stress area instead of penetrating cracks caused by concentrated stress; a large amount of pressure energy can be consumed in the craze and shear band forming process, and meanwhile, the elastic deformation capacity of the buffer material can further absorb residual stress, so that the shear stress peak value in the film is remarkably reduced, and film cracking is avoided.

The invention provides a deformation tracking method for an aluminum material in a stamping oil-free stamping process, and the method comprises the steps: calculating the change rate of a direction angle between adjacent images according to an initial direction angle sequence of a texture direction, recognizing a potential jump region, and determining a jump position set and a corresponding space coordinate; obtaining deformation path data of a corresponding area from the jump position set and the corresponding space coordinates, and simulating a shear band evolution trend to obtain a risk change trend chart in a local shear set; for the local shear concentration risk change trend chart, identifying and marking a high-risk area with local reverse rotation, and determining a corrected flow track according to a flow path deviation analysis result; according to the corrected flow track, material flow instability critical state data in the deformation increasing stage are obtained, microcrack initiation signals are continuously monitored, and initiation probability distribution is obtained; and judging an area of which the probability is higher than a preset threshold value from the initiation probability distribution, generating an instability initial position map, and determining extension path prediction.

This invention discloses a preparation process for copper-nickel-silicon alloys for server connectors. This scheme optimizes the proportions of components such as nickel, silicon, and magnesium, and specifically designs the preparation process. Continuous extrusion causes dynamic recrystallization of the ingot, followed by solution treatment to form a supersaturated solid solution. High-density slip bands are generated during cold rolling. During the first-stage aging treatment, the reduction of shear bands promotes the growth of discontinuous Ni2Si phases. Fine cold rolling helps to combine precipitation strengthening and work hardening to achieve a dual-mechanism superposition, further improving the strength and other properties of the copper-nickel-silicon alloy. Second-stage aging helps eliminate internal stress from cold rolling and promotes the precipitation of trace amounts of solute, thereby improving stress relaxation resistance and electrical conductivity. This invention optimizes the component proportions of the copper-nickel-silicon alloy and specifically designs the preparation process, eliminating the need for hot rolling equipment and reducing costs. The prepared copper-nickel-silicon alloy exhibits excellent strength and electrical conductivity.

The present application belongs to the technical field of coating compositions, and particularly relates to a thermal plastic resin coating capable of preventing cracking, and a preparation method and application thereof. The thermal plastic resin coating capable of preventing cracking is prepared from the following raw materials in parts by weight: 88-95 parts of thermal plastic resin, 0.1-2 parts of antioxidant, 0.1-2 parts of light stabilizer, 2-8 parts of modified short fiber aluminum silicate, 2-5 parts of ethylene-vinyl acetate copolymer, and 0-2 parts of color powder. The modified short fiber aluminum silicate is used as a cracking preventing agent, and a double interface optimization mechanism of "surface activation + interface coupling" is utilized to improve the interface bonding force and structural stability of the thermal plastic resin. Meanwhile, the toughening effect of the ethylene-vinyl acetate copolymer is synergized, a silver crack-shear band mechanism is utilized, a synergistic system of "rigid anti-cracking + flexible toughening" is formed, and the anti-cracking performance of the thermal plastic resin coating is improved.