Extracting Crystal Parameters of Laser Repaired Layer by Nanoindentation

doi:10.3901/JME.2021.02.097

Abstract

Abstract: To study the meso-mechanical behavior of laser repaired layer, crystal plasticity material parameters of laser repaired layer are extracted by nanoindentation experiment. The load-displacement curves of laser repaired layers with addition of 304 stainless steel powder and 5% nano WC are first obtained by instrumented indentation tests. The conventional finite element model of nanoindentation is then established to obtain the macroscopic elastic-plastic parameters of the material, and the experimental load-displacement curves are modified by the pile-up/sink-in parameters. Finally, the crystal plasticity material parameters are reversed by crystal plastic finite element model of tensile specimen. The results show that the calculation error of material parameters can be effectively reduced by modifying the experimental load-displacement curve using the pile-up/sink-in parameters. This method can be used to extract crystal plasticity material parameters at small computational cost with high accuracy. It provides a new method for obtaining crystal plasticity material parameters through nanoindentation, and can be used to study the mechanical behavior of materials at mecroscopic scale conveniently.

Key words: nanoindentation, crystal plasticity, laser repair, pile-up, sink-in

CLC Number:

TG142

LI Yinyin, JIANG Wei. Extracting Crystal Parameters of Laser Repaired Layer by Nanoindentation[J]. Journal of Mechanical Engineering, 2021, 57(2): 97-104.

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