Absolute stress determination in orthotropic materials from angular dependences of ultrasonic velocities
Absolute stress determination in orthotropic materials from angular dependences of ultrasonic velocities
复制标题
根据超声波速度的角度依赖性确定正交各向异性材料中的绝对应力
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
S. Rokhlin
中科院分区：
文献类型：
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作者：
A. Degtyar;S. Rokhlin
本文描述了一种由声速的角相关性确定正交各向异性材料中绝对平面应力的方法。不需要关于材料各向异性（纹理）的先验信息，因为应力相关弹性常数和应力是使用最小二乘优化从速度数据中同时发现的。在优化算法中，应力相关弹性常数和应力之间没有关系，因此它们被认为是非耦合变量，但它表明，迭代过程收敛到正确的（耦合）值。该方法适用于应力测量的材料经历了复杂的（可能是塑性的）历史的加载和卸载，因此，它可以用来确定应用和残余应力。为了检查所提出的技术，我们使用不同程度的各向异性和应力水平的实验数据的合成集。利用这些合成数据的计算表明，当压力...
In this paper we describe a method to determine absolute plane stresses in orthotropic materials from the angular dependence of ultrasonic velocities. No prior information on material anisotropy (texture) is required since the stress dependent elastic constants and stresses are found simultaneously from velocity data using least‐squares optimization. In the optimization algorithm no relation between the stress dependent elastic constants and stresses is assumed and therefore they are considered as uncoupled variables, but it is shown that the iteration process converges to the correct (coupled) values. The method is applicable for stress measurements in materials which have undergone a complicated (possibly plastic) history of loading and unloading; thus it can be used to determine both applied and residual stresses. To check the proposed technique we use synthetic sets of experimental data for different degrees of anisotropy and stress levels. Calculations using these synthetic data show that when the pr...