Theoretical and experimental determination of the natural and initial acoustoelastic coefficients
Theoretical and experimental determination of the natural and initial acoustoelastic coefficients
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DOI：
10.1063/1.1472997
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发表时间：
2002-05
期刊：
影响因子：
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通讯作者：
M. Duquennoy;Mohammadi Ouaftouch;M. Ourak;F. Jenot;W. Xu
中科院分区：
文献类型：
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作者：
M. Duquennoy;Mohammadi Ouaftouch;M. Ourak;F. Jenot;W. Xu
应力对超声波传播的主要影响是超声波传播速度的变化。通常，由于应力引起的波速的相对变化与后者成比例，比例系数被称为声弹性系数。对于大多数超声方法，这些声弹性系数的值的知识是必要的，以评估应力场。本文讨论了用自然坐标定义的声弹性系数估算残余应力所引起的误差。从理论上和实验上确定并比较了用自然坐标和初始坐标表示的声弹性系数之间的差异。它示出的一些系数的值可以根据所使用的坐标系显着变化，估计的残余应力的后果可能是重要的。
The main effect of stresses on the propagation of ultrasonic wave is the variation of its velocity. Generally, the relative change of wave velocity due to the stress is proportional to the latter and the proportional coefficient is known as the acoustoelastic coefficient. For most of ultrasonic methods, the knowledge of the value of these acoustoelastic coefficients is necessary to evaluate stress field. This paper is devoted to the evaluation of the error introduced by the use of acoustoelastic coefficients defined with the natural coordinates for the estimation of residual stresses. The differences between the acoustoelastic coefficients expressed with the natural and initial coordinates are theoretically and experimentally determined and compared. It is shown that the value of some coefficients can vary significantly according to the used system of coordinates and that the consequence on the estimation of residual stresses can be important.