文献类型：期刊文献

英文题名：Modeling of ultrasonic nonlinearities for dislocation evolution in plastically deformed materials: Simulation and experimental validation

作者：Zhu, Wujun[1];Deng, Mingxi[2];Xiang, Yanxun[1];Xuan, Fu-Zhen[1];Liu, Changjun[1];Wang, Yi-Ning[3]

机构：[1]E China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, MOE, Shanghai 200237, Peoples R China;[2]Logist Engn Univ, Dept Phys, Chongqing 401331, Peoples R China;[3]Special Equipment Safety Supervis Inspect Inst Ji, Nanjing 211178, Jiangsu, Peoples R China

年份：2016

卷号：68

起止页码：134

外文期刊名：ULTRASONICS

收录：;EI(收录号：20161102080246);WOS:【SCI-EXPANDED(收录号:WOS:000372527000016)】；

基金：The authors Thank Ms. Qun Li, Sinopec Ningbo Engineering Co., LTD for carrying out specimens fabrication. This work is supported by National Natural Science Foundation of China (Grant Nos. 51325504, 11474093 and 11474361), Shanghai Rising-Star Program (Grant No. 14QA1401200).

语种：英文

外文关键词：Ultrasonic nonlinearity; Second-harmonic generation; Plastic deformation; Finite element modeling

摘要：A nonlinear constitutive relationship was established to investigate nonlinear behaviors of ultrasonic wave propagation in plastically damaged media based on analyses of mixed dislocation evolution. Finite element simulations of longitudinal wave propagation in plastically deformed martensite stainless steel were performed based on the proposed nonlinear constitutive relationship, in which the contribution of mixed dislocation to acoustic nonlinearity was considered. The simulated results were validated by experimental measurements of plastically deformed 30Cr2Ni4MoV martensite stainless steels. Simulated and experimental results both reveal a monotonically increasing tendency of the normalized acoustic nonlinearity parameter as a function of plastic strain. Microscopic studies revealed that the changes of the acoustic nonlinearity are mainly attributed to dislocation evolutions, such as dislocation density, dislocation length, and the type and fraction of dislocations during plastic loading. (C) 2016 Elsevier B.V. All rights reserved.