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材料工程  2015 

超声相控阵延迟时间的声速校正及在复合材料中的检测

DOI: 10.11868/j.issn.1001-4381.2015.09.012, PP. 74-79

Keywords: 复合材料,各向异性,超声检测,相控阵,声速校正

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Abstract:

针对复合材料各向异性会导致声速随声波传播方向变化的现象,提出一种沿声波传播方向对相控阵延迟时间进行声速校正的方法。采用时域有限差分数值仿真方法分析相控阵超声波束在复合材料中的传播特性,验证提出的声速校正方法。搭建相控阵超声检测系统,对碳纤维增强树脂基复合材料平板试样进行检测实验,结果可见声速校正后近表面区域信噪比和缺陷检出率明显提高。研究表明所提出的相控阵延迟时间声速校正方法可缓解相控阵超声波束扩散,提高各向异性材料检测能力。

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