31 results about "Compressive creep" patented technology

The invention provides a method for constructing a constitutive model of compression creep of a metal material. The method comprises the following steps: 1) constructing the constitutive model of the metal material under nominal compression stress; 2) determining a creep time threshold value of the metal material; 3) determining creep characteristic constants A and B and creep time influence parameters n and m of the material; and 4) substituting the determined material parameters A, n, m and B into the constitutive model under the nominal compression stress to obtain the compression creep constitutive model of the metal material. According to the method, the change relation of the creep strain of the metal material under the constant compression load along with time can be described, and the creep deformation behavior of the metal material under the long-term compression load can also be predicted, so that the design of a structural member is optimized, and the service reliability of the structural member is improved.

To provide a thermoplastic resin film which is suitable for low-temperature fusion bonding while being capable of preventing clouding over time at high temperatures.SOLUTION: A thermoplastic resin film has a single-layer structure or a multilayer structure. The thermoplastic resin film includes at least a thermoplastic resin layer (A) containing a thermoplastic resin. If the thermoplastic resin film has a multilayer structure, at least one outermost layer is the thermoplastic resin layer (A). The thermoplastic resin layer (A) exhibits a thickness variation of at least 80 μm under compression in a compression creep test performed under specific conditions. The thermoplastic resin film contains a metal salt of an organic acid with a total carbon number of 5 or more.SELECTED DRAWING: None

A method for measuring the compressive creep of a concrete test block comprises: firstly, making a special concrete test block creep measurement device, which includes a placement plate, a support pole, a crossbeam, a pressure device, a measuring device, and a pressure hanging basket. The placement plate is provided with leveling bolts and a leveling bubble, and the pressure device includes a pressure pole and a pressure plate. When using the device, the placement plate is leveled using the leveling bolts, a suitable pressure plate is selected, the support pole is fixed, and then the pressure device, measuring device, and pressure hanging basket are fixed to the designed position of the crossbeam. The concrete test block to be tested is placed under the pressure plate and adjusted to be centered. A weight of the designed weight is placed on the pressure hanging basket, and the data of the measuring device is recorded to calculate the creep of the concrete test block. By amplifying gravity and applying it to the concrete test block to be tested using the principle of a lever, the amount of weights used and the space occupied by the weights can be reduced. The creep of the concrete test block is amplified by the lever, and the creep of the concrete test block can be calculated by recording the measurement data.

A separator, a battery cell, a battery, and an electric device. The separator comprises a porous base material. The porous base material satisfies at least one of the following conditions (1) to (3): (1) when t is 300 seconds, the compressive creep compliance of the porous base material is 0.05 MPa-1 to 0.24 MPa-1; (2) when t is 1,800 seconds, the compressive creep compliance of the porous base material is 0.12 MPa-1 to 0.36 MPa-1; and (3) when t is 3,600 seconds, the compressive creep compliance of the porous base material is 0.23 MPa-1 to 0.52 MPa-1. The provided separator enables a battery to have good cycle performance and rate performance.

This invention relates to the field of concrete life assessment technology, and discloses a method and system for assessing the lifespan of GRPC structures based on ensemble learning. The method includes: calculating the creep coefficient of GRPC under compression; constructing a creep clock based on the development trend of the creep coefficient, and constructing a damage clock based on the creep clock; outputting lifespan decay parameters characterizing the influence of dual-clock coupling on lifespan decay; performing sensitivity analysis on the coupling parameters of the creep clock and the damage clock to obtain a set of coupling influence parameters; optimizing the coupling influence parameter set to obtain a lifespan feature set for ensemble learning; constructing a GRPC structure lifespan prediction model; and using the GRPC structure lifespan prediction model to predict the lifespan of the GRPC structure under assessment, obtaining the GRPC structure lifespan assessment result. This invention provides the lifespan decay law of GRPC under the condition of co-evolution of compressive creep and damage, improving the accuracy of lifespan assessment.

The invention relates to the technical field of mechanical testing of materials, and discloses a compression creep test tool and a test method.The compression creep test tool is ingenious in design and mainly comprises an upper clamp, a lower clamp, a pin, an extensometer, a cushion block and the like. The tool fixes the upper and lower clamps through a pin structure to ensure the stability of the test device. The extensometer and the clamp move synchronously, creep deformation of the sample is monitored in real time, an electric signal is transmitted to a control system through a cable to be analyzed, and the creep rate and the total deformation are calculated. In order to improve the test efficiency and accuracy, coaxial guide and translation guide designs are introduced in the second embodiment, so that the test sample is quickly put in and taken out, and the coaxiality of the clamp is ensured. In the third embodiment, the stability and reliability of the experiment in a long term and a short term are ensured by introducing a pressure source switching mechanism and utilizing gravity traction and a mechanical traction assembly. The whole tool is easy and convenient to assemble and convenient to operate, and important data support is provided for material performance research and structural design.

The utility model relates to a compression creep test tool and a creep test machine. The compression creep test tool comprises a first tool, a second tool and a fixing piece, the first tool is connected with a first stretching end of the creep testing machine, a compression channel is arranged in the first tool, the compression channel extends in the axial direction of the first tool and penetrates through one end of the first tool, the second tool is connected with a second stretching end of the creep testing machine, a containing cavity is formed in the second tool, and the containing cavity is suitable for containing a metal sample; the fixing piece penetrates through the containing cavity and the compression channel in the first direction, the fixing piece and the first tool are relatively fixed, the second tool is in sliding fit with the compression channel in the axial direction of the first tool, one end of the metal sample abuts against the wall face of the containing cavity, and the other end of the metal sample abuts against the fixing piece. The compression creep test tool disclosed by the utility model can be applied to a tensile creep test machine, can be used for carrying out a compression test on a metal material, and is beneficial to expanding the application range of the test machine.

The invention relates to the technical field of coal mine application, and discloses a constant-temperature compression creep test device which comprises a base, a top plate is fixedly connected to the surface of the base, a plurality of first fixed pulleys are arranged on the surface of the top plate, and a coordination mechanism is arranged on the surface of the top plate perpendicular to the gravity center direction of the ground and matched with the first fixed pulleys. The equidirectional pressure orientation mechanism is provided for a creep test material, the equidirectional pressure orientation mechanism is arranged in the base, and through the arrangement of the coordination mechanism, the observation mechanism and the pressurization mechanism, three groups of same test samples can be rapidly tested at different pressures at the same time, various conditions of an initial setting loaded creep test of the high-water filling material are met, the test can be carried out in multiple lines, and the test efficiency is improved. Meanwhile, due to the arrangement of the pulley block, the gravity can be amplified by one time, two times and four times when the balance weight is added, and the problem that a jack and a hydraulic servo in a large device are prone to pressure relief and cannot provide long-term stability is solved while carrying is convenient.

This invention relates to the field of polymer materials, specifically providing a composite material, its preparation method, and its application. The composite material comprises, by weight, the following components: 50-100 parts of PFA resin, 5-30 parts of fibrous filler and / or mineral filler, and 1-20 parts of polysiloxane dispersant. By using PFA resin, fibrous filler and / or mineral filler, and polysiloxane dispersant in the above-mentioned specific ratio, a self-lubricating, low-wear PFA composite material is prepared. Testing shows that its hardness is increased by more than 10% compared to pure PFA resin, its compression creep is reduced by more than 40%, and its wear is reduced by 30%.

The present invention provides an interlayer film for laminated glass that can suppress the occurrence of blisters at the ends of the laminated glass and improve the transparency of the laminated glass even without high-temperature and high-pressure treatment in an autoclave. The interlayer film for laminated glass of the present invention is an interlayer film for laminated glass having a structure of one layer or a structure of two or more layers. Among them, the interlayer film has a first layer. When a specific compression creep test is performed on test sample A with a diameter of 8 mm and a thickness of 0.8 mm obtained by cutting the first layer, the change in the thickness of test sample A before and after the compression creep test is 50 μm or more and 325 μm or less.

The application relates to a calculation method of compression creep of a titanium alloy-carbon fiber reinforced composite single lap adhesive joint, and belongs to the technical field of long-term service performance analysis and numerical calculation of dissimilar material connection structures. The joint is divided into a titanium alloy region, a composite material region and a glue layer region, compression creep constitutive models are respectively established, a multi-region coupling relationship is constructed, compression creep increments of the regions are calculated step by step under a time increment framework, joint updating is carried out in combination with displacement coordination and internal force balance, and long-term compression creep response results are output after iterative convergence. The method simultaneously considers the glue layer dominant creep and the parent material auxiliary time-varying response under a unified solution framework, can represent end stress redistribution, load transmission path evolution and failure risk in the long-term compression process, and significantly improves the prediction accuracy of the long-term service performance of the joint.

The invention provides a high-temperature compression creep / press-in creep performance multifunctional testing device which comprises a Rockwell hardness tester, a heating and heat preservation component, a displacement measuring component and a control terminal, the Rockwell hardness tester comprises a pressure head fixing groove, a compression pressure head or a press-in pressure head is mounted in the pressure head fixing groove, a mounting hole is formed in the side wall of the pressure head fixing groove, and the pressure head fixing groove is connected with the heating and heat preservation component. The heating and heat preservation component comprises an oil cup and a heating furnace, the heating furnace is located on a lifting platform of the Rockwell hardness tester, the oil cup is located in the heating furnace, the displacement measuring component comprises a displacement rod, a dial indicator and a fixed support, one end of the displacement rod is inserted into the mounting hole, the fixed support is mounted on a rack of the Rockwell hardness tester, and the dial indicator is connected with the fixed support. A probe of the dial indicator abuts against the lower portion of the other end of the displacement rod and is perpendicular to the displacement rod, and the control terminal is connected with the heating furnace and the dial indicator. According to the invention, different pressure heads can be replaced for different performance tests, the construction is simple, and the cost is low.

A thermoplastic resin film includes at least a thermoplastic resin layer including a thermoplastic resin, and when the thermoplastic resin film has a multilayer structure, at least one outermost layer is the thermoplastic resin layer. The thermoplastic resin layer has an amount of change in thickness of 80 μm or more when compressed according to a compressive creep test conducted under predetermined conditions, and the thermoplastic resin layer has a storage modulus at 90° C. of 1.4×105 Pa or more. A laminated body includes the thermoplastic resin film and a different functional layer. An optical laminated body includes first and second transparent material substrates, and the thermoplastic resin film or the laminated body. The thermoplastic resin film has good film formability that, even without going through an autoclave process under high-temperature and high-pressure conditions, can suppress residual air and the formation of air bubbles at a peripheral portion during compression bonding.

The present invention provides a method for constructing a compressive creep constitutive model of a metal material, which comprises: 1) constructing a constitutive model of the metal material under nominal compressive stress; 2) determining the creep time threshold of the metal material; 3) determining the creep characteristic constant of the material A and B and creep time influencing parameters n and m ;4) Determine the material parameters A 、 n 、 m and B Substituting this into the constitutive model under nominal compressive stress yields a compressive creep constitutive model for metal materials. This method can describe the temporal relationship between creep strain and deformation under constant compressive loads, and can also predict the creep deformation behavior of metal materials under long-term compressive loads, thereby optimizing the design of structural components and improving their service reliability.

The invention discloses a variable-cross-section compression creep sample and a processing method, and belongs to the technical field of sample manufacturing of compression creep tests.The sample comprises a uniform-cross-section working section and a variable-cross-section transition section, the uniform-cross-section working section is a cylinder, and the variable-cross-section transition section is a variable-diameter rotary body with the axis of the sample as the rotation center; the diameter of the variable-diameter rotary body is gradually increased from the end close to the uniform-section working section to the contact end surface; the side contour line of the variable-diameter rotary body is a part of an elliptic arc of an ellipse, the long axis a of the ellipse is vertical or basically vertical to the axis of the sample, and the short axis b of the ellipse is parallel or basically parallel to the axis of the sample; and the ratio range of the long axis a to the short axis b of the ellipse is 1.5-2.5. The variable cross-section compression creep test sample can simultaneously solve the problems of uneven deformation and test bed damage.

This invention discloses a high-temperature resistant and creep-resistant asbestos-free composite sealing board and its preparation method. The board is made from raw materials comprising 30-50 parts inorganic fibers, 10-20 parts high-temperature resistant organic fibers, 25-45 parts high-temperature resistant functional fillers, and 8-18 parts composite binder. The composite binder is pre-mixed from liquid phenolic resin and nano-silica sol at a dry weight ratio of 1:(0.5-2). The board has a localized inorganic reinforcing network formed by the accumulation and curing of nano-silica sol in the pores and interfaces of the fiber network. The preparation method includes: fiber dispersion and pulping, composite slurry preparation, wet paper forming, supplementary impregnation and pre-curing, segmented hot pressing curing, and post-heat treatment. This invention, by combining an organic-inorganic composite bonding system with a specific process, significantly improves the board's resistance to compression creep and sealing durability at high temperatures, solving the technical problem of easy loosening and leakage of traditional asbestos-free sealing materials under extreme conditions.

To provide an interlayer film for laminated glass capable of suppressing occurrence of foaming in an end part of the laminated glass, and increasing the transparency of the laminated glass without conducting a high-temperature and high-pressure process by means of an autoclave.SOLUTION: An interlayer film for laminated glass according to the present invention is an interlayer film for laminated glass having a one-layer structure or a two or more-layer structure, and includes a first layer having a thickness of 200 μm or more and 900 μm or less. When the thickness of the first layer is defined as TB μm, and a test sample B having a diameter of 8 mm and a thickness of TB μm obtained by cutting out the first layer is subjected to a predetermined compression creep test, a variation in thickness of the test sample B before and after the compression creep test is 50 μm or more and 325 μm or less.SELECTED DRAWING: Figure 1

This utility model provides a tooling for measuring deformation in compression creep tests of metallic materials, belonging to the technical field of material testing tooling. It includes a first mounting frame and a second mounting frame coaxially and slidably connected. The second mounting frame has a mounting cavity for accommodating a metal sample. An abutment plate for compressing the metal sample is slidably disposed within the mounting cavity along the axial direction of the second mounting frame, and the abutment plate is connected to the first mounting frame. An extensometer is mounted on the second mounting frame to measure its own movement relative to the first mounting frame to compress the metal sample. This invention improves the convenience of measuring deformation in compression creep tests of metallic samples.

The present invention discloses a method for predicting the compression creep strain of reconstructed bamboo based on an improved Kelvin-Voight model. The method firstly performs creep tests on reconstructed bamboo under two different stress levels, and adopts a new Kelvin-Voight viscoelastic mechanical constitutive relationship model defined based on variable-order R-L fractional theory to analyze the reconstructed bamboo, and obtains the main parameter values ​​of the model under the two stress levels; secondly, exponential functions and power functions are respectively adopted to fit the relationship between stress and main model parameters, and the values ​​of these model parameters under other arbitrary specified stress levels are obtained; finally, based on the parameter values ​​obtained in the previous step and the Kelvin-Voight model, the compression creep of reconstructed bamboo under other stress levels is predicted. The research results show that the method can effectively overcome the defect of strong dispersion of mechanical properties of reconstructed bamboo itself, accurately predict the compression creep strain of multiple reconstructed bamboo specimens, and has good engineering applicability.

The present invention relates to a laminated film comprising a base material and a functional layer that is provided on one surface side of the base material, wherein the compressive creep strain of the laminated film at 200°C is 4.9-20 um, and the storage elastic modulus of the laminated film at 200°C is 33 MPa or greater.

An axial compression creep test device and test method belong to the field of nuclear engineering materials. The axial compression creep test device comprises a base, a guide rod, a pressing plate, a pressing device and a deflection rod. The base is connected to one end of the guide rod, the pressing plate is provided through the other end of the guide rod and is subjected to pressure towards the base by the pressing device, the pipe to be tested is abutted between the base and the pressing plate, a plurality of deflection rods are arranged on the outer circumferential side of the pipe to be tested, and the two ends of the deflection rod are abutted to the base and the pressing plate and are subjected to bending deformation. The device converts the axial compression creep deformation of the pipe to be tested into the bending deformation of the deflection rod, realizes the amplification of the deformation amount, so that the deformation amount can be measured outside the irradiation capsule by a non-destructive testing method, thereby realizing the continuous measurement of the same sample, improving the measurement accuracy and reducing the test cost.

A heat treatment method for strengthening the high-temperature compression creep properties of a high-niobium TiAl alloy by inducing carbide precipitation and regulating the distribution configuration of the second phase. The present invention relates to the technical field of high-niobium TiAl alloys. The present invention aims to solve the technical problem of insufficient creep properties of current high-niobium TiAl alloys. Method: Melting and preparing an alloy ingot; determining the phase transformation temperature of the as-cast alloy; performing two-step heat treatment of solution treatment and aging treatment on the alloy. The original structure of the high-niobium TiAl alloy prepared by the present invention is a near-lamellar structure, without carbide precipitation, and there are large-sized strip-shaped Y2O3 second phases; after heat treatment, the microstructure morphology remains basically unchanged, still a near-lamellar structure, but carbides precipitate at the lamellar interfaces, Y2O3 becomes fine ellipsoidal, and partial spheroidization also occurs in the B2 phase. The present invention simplifies the production process through a two-step heat treatment process, and significantly improves the creep properties on the premise that the original structure remains basically unchanged and the room-temperature plasticity of the alloy does not decrease significantly. The present invention is used to improve the creep properties of high-niobium TiAl alloys.

This application provides a foam sandwich structure and its manufacturing method. The composite foam sandwich structure consists of an upper panel, a lower panel, and an internally encapsulated foam core. Based on the curing deformation trends of the upper and lower panels, different segmented foam combination layouts are designed to obtain different foam creep deformation trends. The deformation trends of the two panels cancel each other out, thereby controlling the overall curing deformation of the product. A design theory for compressive creep compensation of mixed foam is established to offset the large compressive creep of low-density foam, ensuring that the product surface is flat and free of depressions. This invention can improve the overall performance of the foam core assembly, making the product both lightweight and high-strength. By reducing curing deformation, assembly accuracy and efficiency can be improved, while achieving product lightweighting.

The present invention discloses a device for a metal gasket compression creep experiment and an experimental method thereof, relating to the technical field of experimental devices, comprising an upper support, a lower support and a plurality of support columns, wherein the support columns are arranged between the upper support and the lower support, the upper support is provided with an extrusion block, the lower support is provided with a compression chamber, an air transmission chamber is provided inside the lower support, and the extrusion block is slidably connected to the support columns; the metal gasket is placed in the compression chamber, and then the air transmission chamber transmits air to the compression chamber, and impurities on the surface of the metal gasket fall off under the action of the air, thereby improving the cleanliness of the metal gasket surface, and using heat to dry the compression chamber, the extrusion block moves along the support column, the extrusion block moves to the side close to the compression chamber, and then the extrusion block contacts the metal gasket to perform a creep experiment, thereby improving the accuracy of metal gasket experiments under different environments.

The invention provides a foaming sole material which is a dynamic fatigue-resistant foaming sole material with a low thickness change rate. The invention also provides an application of the vinyl-acrylate nanofiber in preparation of a foaming sole material. According to the invention, a modified thermoplastic polyurethane elastomer which is a rigid cross-linked network copolymer with strong polarity and stable structure is designed firstly, and then the modified thermoplastic polyurethane elastomer is used as a reinforcing skeleton to inhibit cell collapse and improve compressive creep resistance; further compounding with EVA (Ethylene Vinyl Acetate), a polyolefin elastomer, vinyl-acrylate nanofiber and a compatilizer to form a three-dimensional support network, and preparing into a light-weight high-elasticity sole material through a foaming process. The composite material has excellent dynamic durability, the thickness change rate under the dynamic compression condition is smaller than or equal to 10%, and the rebound rate before and after fatigue / the energy regression rate / the change lt of the damping G value is obtained; the comprehensive performance requirements of high-strength sports shoes on light weight, high resilience and long-term deformation stability can be met.

The present invention provides a metal pipe irradiation compression creep test device and method, which relates to the technical field of the design of metal materials for reactor cores. Aiming at the problem that it is difficult to reproduce the true service environment of metal pipe samples for creep tests, a pressure is applied to the metal pipe through a test box in cooperation with a compression component. After adjusting the thermal resistance, the temperature of the metal pipe specimen is controlled at the temperature level in the operating environment of a commercial pressurized water reactor, and it is placed in a test reactor or a commercial reactor to receive neutron irradiation, achieving synchronous loading of multiple test environments for the metal pipe sample and reproducing the true service environment of the sample to meet the research requirements of creep behavior.

The invention provides a foam sandwich structure and a manufacturing method thereof.The composite material foam sandwich structure is composed of an upper panel, a lower panel and a foam core wrapped inside, different block foam combination layout modes are designed according to the curing deformation trend of the upper panel and the lower panel, and different foam creep deformation trends are obtained; the deformation trends of the two are counteracted, so that the curing deformation of the whole product is controlled; a mixed foam compression creep compensation amount design theory is established, the large compression creep amount of low-density foam is counteracted, and it is guaranteed that the surface of a product is smooth and free of pits; the overall performance of the foam core assembly can be improved, the product has the characteristics of light weight and high strength, the assembly precision and efficiency can be improved by reducing curing deformation, and meanwhile the product is light in weight.

The invention relates to the technical field of coral sand creep constitutive model construction, and discloses a method for constructing a coral sand creep constitutive model, comprising the following steps: obtaining a dynamic deformation of a coral sand sample that changes with strain and time in a compression creep test; constructing a strain-time relationship curve based on the dynamic deformation, and judging the linear characteristics of the strain-time relationship curve; selecting multiple creep models to form a model set according to the linear characteristics; using a parameter inversion method, substituting required parameters of multiple creep models obtained by inversion calculation into each creep model, and calculating the creep deformation and viscosity coefficient of each creep model under the action of a time and load output program; obtaining a target model by comparison; solving multiple target models to obtain parameter inversion results; using the parameter inversion results to obtain creep curves calculated under multiple target models, and respectively obtaining creep characteristics corresponding to the multiple target models; combining the multiple target models to obtain a creep constitutive model for coral sand.

The utility model belongs to the technical field of civil engineering testing, and particularly discloses a horizontal concrete compression creep testing device which comprises a bottom plate, twisted steel, a tensioning component, a supporting component, an anchor cable stress meter, a first bearing plate, a second bearing plate, a concrete test block, a first anchoring nut, a second anchoring nut and a dial indicator. The threaded reinforcing steel bar penetrates through the concrete test block, the concrete test block is pressed through cooperation of the tensioning component, the first bearing plate, the second bearing plate and the anchoring nut to simulate stress of the concrete test block, deformation of the concrete test block is reflected through the dial indicator, and therefore creep of concrete is monitored, the adaptability of the device is improved, and the test efficiency is improved. Therefore, the device can be suitable for concrete test blocks with different shapes and sizes, the structure of the device is simpler, and the monitoring cost is reduced while the operation and maintenance convenience is improved.

The application relates to the technical field of modified polytetrafluoroethylene composite materials, and discloses a high-wear-resistance and creep-resistance modified polytetrafluoroethylene composite material and application of the material in a precision shaft sleeve. In the material, nano zirconium oxide is fixed on the surface of chopped carbon fibers and near the lap joint nodes together with polyamide acid, preferably, octaaminophenyl cage polysilsesquioxane is further introduced to form a POSS hybrid polyimide interface layer, and then the material is mixed with polytetrafluoroethylene and flaky graphite, cold-pressed and sintered. The obtained multi-scale bearing structure can reduce particle agglomeration and falling, limit the interface and fiber node slip, and improve the wear resistance, compression creep resistance of the material and the long-term dimensional stability of the precision shaft sleeve.