• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2021, Vol. 57 ›› Issue (2): 97-104.doi: 10.3901/JME.2021.02.097

• 材料科学与工程 • 上一篇    下一篇

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基于纳米压痕的激光修复层晶体材料常数反演方法

李银银, 蒋玮   

  1. 大连理工大学机械工程学院 大连 116024
  • 收稿日期:2020-05-07 修回日期:2020-09-01 出版日期:2021-01-20 发布日期:2021-03-15
  • 通讯作者: 蒋玮(通信作者),女,1966年出生,博士,教授,博士研究生导师。主要研究方向为计算机辅助设计、制造及工程分析(CAD/CAM/CAE)、机械结构强度与失效。E-mail:jiangwei@dlut.edu.cn
  • 作者简介:李银银,男,1989年出生,博士研究生。主要研究方向为机械结构强度与失效。E-mail:liyyhbsy@163.com
  • 基金资助:
    国家自然科学基金资助项目(51575076)。

Extracting Crystal Parameters of Laser Repaired Layer by Nanoindentation

LI Yinyin, JIANG Wei   

  1. School of Mechanical Engineering, Dalian University of Technology, Dalian 116024
  • Received:2020-05-07 Revised:2020-09-01 Online:2021-01-20 Published:2021-03-15

摘要: 为了研究裂纹激光修复层的细观力学行为,利用纳米压痕试验确定激光修复层晶体塑性材料常数。首先,运用纳米压痕仪获得添加304不锈钢粉末及其质量分数为5%的纳米WC的激光修复层的载荷-位移曲线。然后,运用纳米压痕的常规有限元模型对修复层材料的宏观弹塑性参数进行求解,通过堆积/沉陷参数对试验载荷-位移曲线进行修正。最后运用拉伸试件的晶体塑性有限元模型对修复层材料的晶体塑性常数进行反演。结果表明,通过堆积/沉陷参数对试验载荷-位移曲线进行修正,能够有效地减小计算误差;同时该方法能够以较小计算量和较高计算精度确定晶体塑性常数,为通过纳米压痕试验获得晶体塑性材料常数提供了一种新的方法,也为从细观尺度研究材料的力学行为提供了方便。

关键词: 纳米压痕, 晶体塑性, 激光修复, 堆积, 沉陷

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

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