一个新的声应力系数及其确定  

DEFINITION AND DETERMINATION OF A NEW ACOUSTIC-STRESS COEFFICIENT

作　　者：孙强[1] 张忠平[1] 李春旺[1] 乔艳江[1] 赵文轸[2] 

机构地区：[1]空军工程大学,西安710051 [2]西安交通大学

出　　处：《力学与实践》2005年第4期62-64,共3页Mechanics in Engineering

基　　金：空军工程大学学术基金项目(2002×18)资助

摘　　要：为建立声焦散线与平面应力条件下裂尖应力强度因子的关系,定义了一个新的声应力系数——声程差随应力线性变化的比例系数,该系数的大小既取决于材料常数又取决于耦合介质及声束的传播历程.借助6061-T6铝、EPTI钢两种材料的实验结果,说明了确定新的声应力系数的方法与步骤.所得结论是:只要确定了平面应力条件下超声纵波速度相对变化与主应力和之比,便可确定新的声应力系数.In order to establish the relationship between acousto-caustics and stress intensity factor under plane stress condition, a new acoustic-stress coefficient--the ratio between acoustic-path difference and stress is defined. The new coefficient is related not only to the material properties but also to the coupling medium and the acoustic traveling path. The method and the steps to get the new coefficient are described together with the tested results of 6061-T6 aluminum and EPTI steel. It is concluded that the new acousto-stress coefficient can be obtained as soon as the ratio of relative change of ultrasonic longitudinal wave to the sum of the principal stresses under plane stress condition is known.

关 键 词：声应力系数 超声焦散线 超声纵波 应力强度因子 

分 类 号：O426[理学—声学]