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中文摘要：
采用最低阶水平剪切模态SH0对梁结构进行检测,并用时间反转法对信号重构,计算出不同深度刻槽下损伤指数,对梁结构的损伤程度进行表征。试验采用厚度剪切式压电传感器激励接收SH0模态,对不同深度尺寸的槽型缺陷进行了检测,并将接收信号进行时间反转得到重构信号。通过重构信号与激励信号的对比得到损伤指数。结果表明：随着缺陷深度的增加,损伤指数呈指数单调上升趋势,基于时间反转法的水平剪切导波技术对梁结构缺陷检测具有一定潜力。
英文摘要：
The fundamental shear horizontal mode SH0 was used for beam detection and time reversal method was applied to signal reconstruction.Under the condition of the notch with different depths,damage index（DI）was calculated and used to characterize damage levels of beam structures.In the experiment,thickness-shear piezoelectric transducers were used for the excitation and reception of SH0 mode and the notch with different depths was detected.Captured signals were time-reversed and reconstruction signal was obtained.Damage index can be calculated by the comparison between reconstruction signals and excitation signal.The result showed the value of DI increased monotonically with the increase of damage depth.The research demonstrats there is a certain potential to detect defects in beams by using shear horizontal guided wave method based on time reversal method.
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