冷挤压变壁厚药筒件的超声兰姆波探伤

详细介绍了超声兰姆波的主要特点和多种传播模式，通过对小口径弹药筒壁厚尺寸与缺陷的分析和兰姆波特征曲线的求解，选择合理的药筒兰姆波探伤模式。采用3种标准伤样件验证了药筒管壁内、外表面探伤灵敏度的变化规律，内外表面探伤灵敏度差异，以及探伤灵敏度与标准伤刻痕深度的关系，论证了超声兰姆波单模式探伤的可行性和模式选择。

A Study of Ultrasonic Lamb Wave Flaw Detection Mode Selection for Cartridge Case with Variable Wall Thickness

This paper introduces the main features and various propagation modes of Lamb wave in detail.By analysis of the wall thickness size and defect of small caliber cartridge case and solution of the Lamb wave characteristic curve,reasonable cartridge case Lamb wave flaw detection mode was selected,the rule of inside and outside surfaces flaw detection sensitivity of cartridge case wall and difference between inside and outside surfaces flaw detection sensitivity as well as the relation between flaw detection sensitivity and standard flaw depth were verified with three types of standard flaw samples,and then the feasibility of single mode flaw detection by ultrasonic Lamb wave and the mode selection were demonstrated.