文献类型：期刊文献

英文题名：Damage assessment in Q690 high strength structural steel using nonlinear Lamb waves

作者：Wang, Xiao[1];Xiang, Yanxun[2];Zhu, Wu-Jun[2];Ding, Tao-Tao[2];Li, Hua-Ying[3]

机构：[1]Tsinghua Univ, Dept Engn Phys, Beijing 100084, Peoples R China;[2]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Safety Sci Pressurized Syst MOE, Shanghai 200237, Peoples R China;[3]Hebei Normal Univ Nationalities, Coll Literature & Commun, Chengde 067000, Peoples R China

年份：2020

卷号：234

外文期刊名：CONSTRUCTION AND BUILDING MATERIALS

收录：;EI(收录号：20194407610126);WOS:【SCI-EXPANDED(收录号:WOS:000514748700013)】；

基金：This research was funded by the National Natural Science Foundation of China (11622430; 11774090; 51835003). The authors would also like to express their gratitude for projects supported by the Beijing Key 646 Laboratory of city integrated Emergency response science.

语种：英文

外文关键词：Nonlinear ultrasonic technique; Lamb wave; Q690 high strength steel; Plastic damage

摘要：The nonlinear ultrasonic technique has been used to assess the plastic damage in High strength Q690 steel. The Q690 steel was stretched to different levels of plastic strain so as to obtain the specimen with different degrees of plastic damage. When strain was increased from 1% to 9%, the nonlinear parameter shows a general upward trend, and in the subsequent strain process, the nonlinear response drop off instead of going up. Meanwhile, metallographic examination indicates that, within the strain 9%, the growth of the void as well as the variation of dislocation structure and density are the main damage characteristic in Q690 steel. Many dislocation structures such as the dislocation cell and dislocation wall have formed in the tensile specimen, which is contribute to raise of the nonlinear effect. The results indicate that the nonlinear ultrasonic technique can be utilized to characterize the plastic damage in Q690 structural steel at the early stage. (C) 2019 Elsevier Ltd. All rights reserved.