Method for identifying tensile property parameters of metal material based on indentation contour

Abstract

The invention discloses a method for identifying tensile property parameters of a metal material based on an indentation contour, which comprises the following steps of: establishing a relationship between an indentation contour snapshot and constitutive parameters of a material, establishing a posterior probability density function of the constitutive parameters of the tested material, solving the posterior probability density function, so that plastic tensile property parameters of the tested metal material are obtained, and probability distribution characteristics of an identification result are given. According to the method, model parameters are processed as random variables on the basis of a statistical Bayesian inversion theory, potential experimental and numerical modeling uncertainty in parameter identification is considered, and a parameter identification result can be given in a probability distribution form; the method is applied to local mechanical property detection of metal materials, mechanical property evolution detection in the material processing process and measurement of mechanical properties of service parts, the experimental process is simple and convenient, and the reliability of parameter identification is high.

Description

technical field [0001] The invention belongs to the technical field of testing methods for plastic mechanical properties of materials, and in particular relates to a method for reversely deducing tensile performance parameters of metal materials to be tested by using spherical indentation shape information in indentation experiments. Background technique [0002] An in-depth understanding of the plastic-tensile properties of metallic materials is a prerequisite for material forming modeling and process analysis. At present, the tensile mechanical properties of metal materials are mostly tested by uniaxial tensile experiments. This conventional experimental method needs to cut the specimen according to a certain geometric shape, and carry out the test of material properties through a destructive stretching process. However, this conventional mechanical property testing method is very destructive, the preparation process of the specimen is cumbersome, and it is difficult to b...

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Problems solved by technology

In addition, due to the objective existence of uncertain factors such as the inhomogeneous structure of the tested material itself and the inaccuracy of the experimental test, there are uncertainties caused by the above factors in the identification of the elastic-plastic parameters of the material based on the indentation test.

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