表面裂纹深度和取向的临界折射纵波检测

来源 :无损检测 | 被引量 : 0次 | 上传用户：gaolch006

【摘要】

：

针对表面裂纹深度和取向的无损表征难题,提出一种基于临界折射纵波(L CR)的检测方法.以碳钢试块表面垂直裂纹(深度为1～8 mm)、倾斜裂纹(长度为10 mm,倾角为15°～90°)为检测对象进行试验,分析了裂纹深度、取向对L CR波信号的影响规律,通过信号幅值和B扫描成像表征裂纹.试验结果表明,L CR波在传播过程中会受到表面裂纹的遮挡作用,并在裂纹尖端产生衍射.随裂纹深度增加,遮挡作用增强,透射L CR波幅值下降且到达时刻延后,对裂纹取向不敏感;B扫描图像中L CR波及对应尖端衍射波的位置、方向与裂纹

【作者】

：

孟亦圆林莉罗忠兵

【机构】

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大连理工大学无损检测研究所,大连 116024

【出处】

：

无损检测

【发表日期】

：

2021年12期

【关键词】

：

表面裂纹临界折射纵波裂纹深度裂纹取向

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表面裂纹深度和取向的临界折射纵波检测

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