Method for assessing elastic modulus and strength of circular or circular-tube brittle material

Abstract

The invention provides a method for testing elastic modulus and breaking strength of a circular or circular-tube brittle material, which comprises the steps of: first machining a pipe or circular material sample to be tested into a notch ring sample, wherein the notch is positioned at the middle part of the sample in the height direction; applying a compression load to the notch ring sample, and calculating the elastic modulus of the material in online linear elastic range according to the obtained load increment, the corresponding compression displacement increment and the size of the sample; and applying the compression load to the sample till the sample is broken, and calculating the strength of the sample according to the critical load and the size of the sample. The method does not need a specific clamp, is not limited by the test environment and condition, can be used for tests in special environments of low temperature, high temperature, ultrahigh temperature, vacuum, toxic andharmful medium and the like in which conventional tests cannot be implemented, solves the problem of difficult machining of samples for testing elastic modulus and strength of pipe-shaped and circular parts, and has important actual application value.

Description

technical field [0001] The invention belongs to the field of material mechanical property detection, and relates to a method for evaluating the elastic modulus and strength of ring-shaped or round-tube-shaped brittle materials. The brittle material mainly refers to a class of materials with very small ultimate strain during fracture, such as ceramics and glass materials. Background technique [0002] The modulus of elasticity reflects the ability of a material to resist deformation caused by external forces, and is one of the basic mechanical properties of a material. Materials scientists and mechanics scientists all over the world have been looking for simple and accurate evaluation techniques for measuring elastic modulus. At present, the commonly used measurement methods are stress-strain method, bending method, displacement sensitive indentation method, acoustic resonance method and ultrasonic wave. The stress-strain method usually requires installing a strain gauge on...

AI Technical Summary

Problems solved by technology

For round tubes or ring-shaped brittle materials that cannot be processed into standard samples, such as tubes or rings with a wall thickness of less than 3mm, they cannot meet the requirements of the existing standards for sample size, so their material properties such as elastic modulus and strength of tests cannot use existing measurement methods

So far, no suitable standards and testing techniques have been identified

Images