13 results about "Compressive creep" patented technology

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.

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 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.

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 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.

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 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.

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 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 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.

The invention discloses a method and a device for predicting the high-temperature creep fatigue life of a nickel-based single crystal. The method comprises the following steps: obtaining a stress-strain hysteretic loop of a material in a stable cycle or a half-life cycle through experimental testing or combination of a material constitutive model and finite element simulation; extracting slitting shear stress, slitting shear strain, slitting positive stress and slitting positive strain on octahedral and hexahedral slip systems according to the stress-strain hysteretic loop and the orientation of the test sample; fatigue damage is calculated according to the stress-strain amplitude on the slip system, creep damage is calculated according to the stress-strain hysteresis loop, and creep-fatigue coupling damage is calculated according to the creep damage and the fatigue damage; and judging whether the creep damage is tensile creep or compression creep so as to calculate total damage, and obtaining the creep fatigue life according to the total damage. According to the method, the crystal anisotropy characteristics of the nickel-based single-crystal high-temperature alloy can be considered in a unified manner, and creep fatigue life prediction based on a physical mechanism is realized.