Low-frequency pulse echo reflection of the fundamental shear horizontal mode from part-thickness elliptical defects in plates.
Low-frequency pulse echo reflection of the fundamental shear horizontal mode from part-thickness elliptical defects in plates.
复制标题
板中部分厚度椭圆缺陷的基本剪切水平模式的低频脉冲回波反射。
DOI：
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发表时间：
2010
影响因子：
2.4
通讯作者：
Peter Cawley
中科院分区：
文献类型：
--
作者：
J. Ma;Peter Cawley
利用引导超声波进行缺陷表征仍然是一个具有挑战性的课题，需要充分理解导波与缺陷的真实表征之间的相互作用。通过有限元分析和实验测量，研究了平板局部厚度椭圆缺陷的SH0模式脉冲回波反射特性。研究表明，由于缺陷两侧的反射相互干扰，椭圆缺陷的SH0模式反射比谱呈现周期性模式。反射比光谱的模式由入射方向缺陷长度与波长之比决定，而大小则受缺陷最大深度和有效宽高比的影响。结果表明，反射比光谱的图型和幅值对入射角高度敏感，且反射随角度变化的形式是缺陷形状的强烈函数。此外，对具有锥形深度轮廓的圆形缺陷的研究表明，反射是锥形缺陷的平均长度与波长比的函数，并且反射的幅度随着波长比的增加而减小。
Defect characterization using guided ultrasonic waves remains a challenging subject and requires a full understanding of the interaction of guided waves with a realistic representation of the defect. The characteristics of pulse echo reflection of the SH0 mode from part-thickness elliptical defects in plates is studied via finite element analysis and experimental measurements. The study shows that the reflection ratio spectrum of the SH0 mode from an elliptical defect exhibits periodic pattern due to interference between reflections from the two edges of the defect. The pattern of the reflection ratio spectrum is determined by the ratio of defect length in the incidence direction to wavelength, while the magnitude is affected by the maximum depth and the effective aspect ratio of the defect. Both the pattern and magnitude of the reflection ratio spectrum are found to be highly sensitive to the incidence angle, and the form of the variation of the reflection with angle is a strong function of the defect shape. In addition, a study of circular defects with tapered depth profiles reveals that the reflection is a function of average length of the tapered defect to wavelength ratio, and the magnitude of the reflection diminishes as the ratio increases.
影响因子：
2.4
作者：
Velichko, Alexander;Wilcox, Paul D.
通讯作者：
Wilcox, Paul D.