Method used for identidying material anisotropic plasticity parameters based on spherical impression morphology

Abstract

The invention discloses a method used for identidying material anisotropic plasticity parameters based on spherical impression morphology. According to the method, a spherical impression equipment isadopted for indentation test of a test piece so as to obtain impression morphology response information left on test piece surface; orthogonal decomposition and parametric approximation are adopted soas to obtain a value model used for representing the relationship of the material anisotropic plasticity mechanical property parameters with the impression morphology response information, reverse derivation constraint optimization problem is adopted so as to obtain the anisotropic plasticity mechanical property parameters of the material to be test through reverse derivation. In applications, the spherical impression morphology information obtained in the indentation experiment is input into the value model, and the anisotropic plasticity mechanical property parameters of the material to betest are obtained through certain steps of calculation. The method can be used in anisotropic material small size sample detection, nondestructive test, and material in-suit test, and the accuracy ofmaterial anisotropic plasticity parameters obtained via reverse derivation using the method is high.

Description

technical field [0001] The invention belongs to the technical field of elastic-plastic mechanical performance testing of materials, and in particular relates to a method for inverting the anisotropic plastic mechanical performance parameters of a metal material to be tested by using indentation shape information acquired in a spherical indentation experiment. Background technique [0002] The use of indentation test technology to obtain the elastic-plastic mechanical properties of sheet metal materials has some advantages that traditional uniaxial tension / compression tests do not have. On the one hand, the specimen preparation period of the indentation test method is short, the experimental process is simple, and the experimental results are reliable. On the other hand, this test technology can be applied to the field of material mechanical performance testing that is inconvenient or impossible to apply to traditional uniaxial tension / compression tests, such as non-destructi...

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Problems solved by technology

Moreover, the existence of plastic anisotropy usually leads to a certain preferred orientation of the sheet metal during the plastic forming process, which has a great influence on the precision plastic forming of the sheet metal.

Although some scholars have established some methods using indentation test to obtain the elastic-plastic mechanical properties of metal materials, these studies mostly focus on isotropic materials.

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