压力容器2016，Vol.33Issue(3)：9-15,7.DOI:10.3969/j.issn.1001-4837.2016.03.002
非线性超声技术表征金属和有机材料塑性损伤的对比试验研究
A Comparative Study on Plastic Damage Characterization of Metallic and Organic Materials Based on Nonlinear Ultrasonic Technique
侯甜甜 1轩福贞 1项延训1
作者信息
- 1. 华东理工大学 机械与动力工程学院 承压系统与安全教育部重点实验室，上海 200237
- 折叠
摘要
Abstract
Nonlinear ultrasonic testing technology is expected to be an important means of testing and characterization of early-damage for in-service engineering materials due to its high sensitivity to micro-structure evolution.The paper studied the nonlinear parameters of copper and organic polymer materials PMMA which undergo various degrees of plastic damage,based on the measurements of ultrasonic nonlin-ear parameters using longitudinal wave.The results show that,with the increase of plastic strain,the non-linear parameters of copper significantly increase as the plastic deformation increases,while the nonlinear parameters of PMMA nearly keep unchanged.Micro-structures of the two materials were observed by the scanning electron microscopy and transmission electron microscopy,indicating that dislocation densities of copper gradually increase during the process of plastic deformation;whereas changes in polymer chain segments are observed at dislocation-free PMMA materials.It is concluded that the changing of dislocation densities may be the predominant factor leading to the change of ultrasonic non-linearity during the process of plastic damage.关键词
非线性超声/PMMA/纯铜/塑性损伤Key words
nonlinear ultrasonic wave/PMMA/copper/plastic damage分类
机械制造引用本文复制引用
侯甜甜,轩福贞,项延训..非线性超声技术表征金属和有机材料塑性损伤的对比试验研究[J].压力容器,2016,33(3):9-15,7.
