基于应力波因子的金属材料表面塑性损伤检测  

Nondestructive Evaluation of Surface Plastic Damage for Metallic Material Based on Stress Wave Factor

作　　者：税国双[1] 黄蓬[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《材料工程》2013年第11期70-74,共5页Journal of Materials Engineering

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)

摘　　要：提出了一种基于应力波因子的金属材料表面塑性损伤检测方法。将AZ31镁铝合金试件加载到不同的拉伸载荷后,利用Ritec SNAP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基于应力波因子的声学非线性系数与应力的关系。研究结果表明,当加载应力接近材料的屈服极限时,基于应力波因子的声学非线性系数随着应力的增加明显增大,因此可以利用基于应力波因子的声学非线性系数对金属材料表面的塑性损伤进行非线性超声无损评价。A method for nonlinear ultrasonic evaluation of surface damage for metallic material is pres ented. Rayleigh waves are excited and acquired with Ritec SNAP nonlinear ultrasonic measurement system, the Fsw-based acoustic nonlinearity parameters （Fsw ANPs） are thus measured at different stress levels for AZ31 magnesium alloy plate specimens. The results show that there is a significant increase in the acoustic nonlinearity parameters with monotonic tensile loads when the stress is close to the yielding stress. The research suggests an effective nondestructive evaluation method to track the mechanical property for the surface of metallic material in a nonlinear ultrasonic way using stress wave factor.

关 键 词：表面塑性损伤 应力波因子 非线性超声 非线性系数 

分 类 号：O426.2[理学—声学]