压痕轮廓信息在材料本构关系反演测量中的应用  

Application of Residual Imprint Profile to Material Constitutive Relation in Identification Via Inverse Analysis

作　　者：闫鹏 郭伟超[1] 李淑娟[1] 李言[1] Yan Peng;Guo Weichao;Li Shujuan;Li Yan(School of Mechanical and Precision Instrument Engineering, Xi′an University of Technology, Xi′an 710048 China)

机构地区：[1]西安理工大学机械与精密仪器工程学院,西安710048

出　　处：《机械科学与技术》2019年第4期639-645,共7页Mechanical Science and Technology for Aerospace Engineering

基　　金：国家自然科学基金项目(51505377);中国博士后科学基金会项目(2016M592821);陕西省自然科学基础研究计划项目(2017JM5102);陕西留学人员科技活动择优项目(302/253081605)资助

摘　　要：金属材料的力学性能,如本构关系可以利用纳米压痕技术反演测量得到,但是测量结果存在不准确、不唯一的问题。为了解决该问题,本文中提出同时利用载荷-位移曲线和压痕轮廓信息来提高本构关系中材料参数的测量精度。利用ANSYS建立了纳米压痕数值模型,通过对比数值模拟和实验获得的载荷-位移曲线,验证了数值模拟的可行性和可靠性;反演测量需要优化迭代来缩小数值模拟与实验的差距,由于ANSYS在优化算法上存在不足,利用MATLAB强大的编程能力,编制了对应的优化求解算法,并且和ANSYS联合求解完成材料本构关系的反演测量。最后,通过实例证明引入压痕轮廓信息可以提高材料本构关系反演测量的准确性和唯一性。The mechanical properties of metals, such as its constitutive relationship can be identified via indentation testing based on the inverse analysis method. However, the identified results are usually not accurate or even not uniqueness. In order to solve this problem, to utilize both loading-displacement curve and residual imprint profile to improve the accuracy of the identified material parameters is proposed. The numerical indentation model is built via ANSYS software, the simulated results are compared to the experimental data for verifying that the numerical indentation model is reliable and available. The identification process is in fact to minimize the difference between the simulated and experimental results via optimization iterations. However, due to the insufficiency of ANSYS in optimization algorithms, MATLAB is performed to compile the corresponding optimization algorithm and combines with ANSYS to carry out the inverse measurement. Finally, a practical illustration is curried out to determine the constitutive relations for some metals. The results clearly show that the imprint profile can significantly improve the identified accuracy of material constitutive relation.

关 键 词：力学性能 纳米压痕 反演测量 本构关系 压痕轮廓 MATLAB 

分 类 号：TG335.6[金属学及工艺—金属压力加工]