摘要
提出了一种金属材料表面涂层损伤的非线性超声评价方法。表面涂层的损伤以及涂层与基体材料间的界面粘接状况与超声信号的非线性效应密切相关。将存在表面涂层的AZ31镁铝合金试件加载到不同的拉伸载荷后,利用RitecSNAP-0.25-7-G2非线性超声测试系统激发和接收Rayleigh表面波,通过实验测试在不同载荷作用后涂层试件的声学非线性系数。研究结果表明,在应力不超过某一极限值的情况下,虽然不能观察到试件表面涂层外观的明显变化,但通过非线性超声实验测试得到的声学非线性系数随着加载应力的增加而不断增加。因此,对具有表面涂层的结构来说,可利用声学非线性系数对其表面涂层的损伤进行非线性超声无损评价。
A method for nonlinear ultrasonic evaluation of coating damage on metallic material was presented.The mechanical damage of coating on metallic material is closely related to the nonlinear effect of ultrasonic waves under weak adhesive bond.Rayleigh waves are excited and acquired with Ritec SNAP-0.25-7-G2 nonlinear ultrasonic measurement system.The acoustic nonlinearity parameters（ANPs） are thus measured at different stress levels for AZ31 magnesium alloy plate specimen with coating.The results show that there is a significant increase in the acoustic nonlinearity parameters with monotonic tensile loads when the stress is less than 150 MPa,although there is no obvious change in appearance of the coating.The research suggests an effective nondestructive evaluation method to track the mechanical property of coating on metallic material in a nonlinear ultrasonic way.
出处
《固体火箭技术》
EI
CAS
CSCD
北大核心
2012年第5期703-706,共4页
Journal of Solid Rocket Technology
基金
国家自然科学基金项目(11172034)
中央高校基本科研业务费支持项目(2011JBM263)
关键词
表面涂层
固体火箭发动机
非线性超声
声学非线性系数
coating
solid rocket motors（SRM）
nonlinear ultrasonic
acoustic nonlinearity parameter（ANP）
