Instrumentation indentation test method for elastic-plastic parameters of material based on single Vickers pressure head

Abstract

The invention discloses an instrumentation indentation test method for elastic-plastic parameters of a material based on a single Vickers pressure head. According to the method, the strain hardening exponent, elasticity modulus and offset yield strength sigma 0.2 of the metal material are determined by virtue of three instrumentation indentation load-depth curves in which indentation positions have special aggregation manners. The method has the advantages that the strain hardening exponent, elasticity modulus and offset yield strength sigma 0.2 of the metal material can be tested only by virtue of the single diamond Vickers pressure head; the high-precision test on the elasticity modulus of the material can be realized based on the tested strain hardening exponent of the material; the indentation positions of the three instrumentation indentation have aggregation properties, and the elastic-plastic parameters of the microcell material can be tested.

Description

technical field [0001] The invention belongs to the field of testing mechanical properties of materials. It specifically relates to a method of testing the strain hardening exponent, modulus of elasticity and conditional yield strength σ of metallic materials using an instrumented indenter and a single Vickers indenter. 0.2 Methods. Background technique [0002] The instrumented indentation test technology obtains the indentation load-depth curve by synchronously measuring the indentation load acting on the diamond indenter and the indentation depth of the diamond indenter into the surface of the tested material in real time. The dimensionless functional relationship between the mechanical property parameters of the measured material can identify many mechanical property parameters of the measured material. [0003] The instrumented indentation test of the elastic modulus of materials mainly includes the "Oliver-Pharr method" or "slope method" proposed by W.C.Oliver and G....

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Problems solved by technology

[0006] The object of the present invention is to provide a kind of material elastoplastic parameter instrumentation indentation test method based on a single Vickers indenter, to solve the problem of determining the strain of me

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