Method for Measuring Creep Mechanical Properties of Materials Using C-shaped Small Samples Supported

Abstract

The invention relates to a method for measuring the creep mechanical properties of materials by using a small sample of a fixed C-shaped ring, belonging to the field of measurement. It includes the design and manufacture of fixed-supported C-ring small samples and fixtures; the establishment of the conversion relationship between the fixed-supported C-ring small sample small deformation stage and uniaxial creep; the establishment of a finite element model, and the conversion is obtained according to the reference stress method formula coefficient; carry out multiple sets of creep tests with the same temperature but different loads on small C-shaped ring samples; derive multiple sets of loading point-time curves obtained from creep tests; perform differential processing on the loading point-time curves to obtain Steady-state displacement rate under different load conditions; put it in log-logarithmic coordinates and perform linear fitting to obtain the uniaxial creep parameters obtained from the inversion of the fixed-supported C-ring. The method has simple stress on the sample, simple test equipment, can obtain fracture data, has nothing to do with the conversion formula between uniaxials and materials, has large deformation of the sample, and high measurement accuracy. It can be widely used in the field of measuring the creep mechanical properties of materials.

Description

technical field [0001] The invention belongs to the field of measurement of material creep, and in particular relates to a method for measuring the mechanical properties of material creep by using a fixed-supported C-shaped ring small sample. Background technique [0002] In order to obtain higher energy efficiency, the working temperature and working pressure of more and more equipment and components are constantly increasing, which puts forward higher requirements on the performance of in-service equipment materials. [0003] For high temperature equipment, creep is the most important form of failure. Many engineering problems involve creep. [0004] Creep, also known as creep, is a phenomenon in which a solid material undergoes slow plastic deformation when the strain increases with time while keeping the stress constant. [0005] Creep often increases with increasing temperature. The rate of creep is related to material properties, loading time, loading temperature an...

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Problems solved by technology

The sample has simple stress, simple test equipment, and can obtain fracture data. The conversion formula between uniaxials has nothing to do with materials. The sample has large deformation and high measurement accuracy, which solves various problems existing in various small samples. disadvantages

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