A Method for Measuring the True Stress of Materials

A technology of real stress and samples, which is applied in the field of material science, can solve the problems of unable to measure and calculate stress, and achieve the effect of strong market promotion value, wide application range and guaranteed accuracy
CN108458929BActive Publication Date: 2020-05-12ANHUI UNIVERSITY OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ANHUI UNIVERSITY OF TECHNOLOGY
Publication Date
2020-05-12

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Abstract

The invention discloses a method for measuring true stress of a material and belongs to the technical field of material science. According to the method disclosed by the invention, a Poisson effect and volume expansion of the material in an elastic deformation region are considered; meanwhile, height localization of deformation of the material in a plastic deformation process is considered, and plastic deformation is finished through formation and sliding of a shear zone. Therefore, in a whole deformation process, an effective loading area can be accurately calculated by combining an originalsize of a sample piece, and the true stress on the sample piece can be accurately measured by utilizing a uniaxial loading load-displacement curve; the method has great significance and value in a process of determining basic mechanical property parameters by utilizing uniaxial loading.
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Description

technical field

[0001] The invention belongs to the technical field of material science, and more specifically relates to a method for measuring the real stress of a material. Background technique

[0002] In order to measure, evaluate and compare the mechanical properties of materials (especially structural materials), the most simple and convenient test methods are uniaxial tension and uniaxial compression, and then calculate the stress according to the load-displacement curve combined with the geometric dimensions of the sample -Strain relationship, so as to obtain four extremely important performance parameters of the material, Young's modulus, yield strength, breaking strength and elongation. In order to reflect the stress state inside the material more accurately, the real stress-strain curve is usually calculated according to the engineering stress-strain curve obtained in the experiment. The calculation formula is derived and explained in relevant textbooks: [0003...

Claims

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