On the Characterization of Effective Detection Depths and Thickness-Direction Inhomogeneous Stresses With the LCR Wave Method
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摘要:
临界折射纵(longitudinal critically refracted wave,简记LCR)波法在结构应力的无损检测中具有显著优势.然而,LCR波法目前还缺少符合物理意义、能够有效表征深度入射波激励频率的解析关系,并且无法适用于构件内沿厚度方向非均匀分布应力的测量.为此,导出了LCR波法测量构件应力分布的有效检测深度与入射波激励频率的解析表达式,提出了一种基于LCR波法测量构件非均匀应力场的逐级差值算法,并通过数值仿真验证了该算法在非均匀应力测量中的有效性
Abstract:The longitudinal critically refracted (LCR) wave method demonstrates significant advantages in non-destructive testing of structural stresses. However, the current LCR wave technique lacks a physically meaningful analytical relationship between effective detection depths and excitation frequencies of incident waves, and cannot be applied to measure non-uniform stress distributions along the component thickness. To address these limitations, an analytical expression for the correlation between effective detection depths and excitation frequencies in the LCR wave method-based stress measurements, was derived. A stepwise difference algorithm was proposed for characterizing non-uniform stress fields with the LCR wave method, and through numerical simulations to validate its effectiveness in measuring inhomogeneous stress distributions.
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