不同幅值激励的复合材料板时间反转损伤识别方法

发布时间：2018-01-28 20:00

本文关键词： 复合材料板损伤识别时间反转激励幅值　出处：《机械科学与技术》2017年02期 　论文类型：期刊论文

【摘要】：复合材料结构受到冲击时会产生基体开裂、层脱等损伤,通常情况下损伤界面保持闭合接触。小幅值激励下应力波产生的应变极小,损伤界面仍处于闭合的线性状态,时间反转重构信号不能表明损伤的存在与否。针对该问题,采用不同幅值激励的时间反转方法进行损伤检测与识别,利用时间反转重构信号与激励信号的相关系数构造了损伤指数,开展了基于压电作动/传感阵列的复合材料板损伤识别与定位的实验研究。实验结果表明:小幅值激励下作动-传感的完整路径和损伤路径上的时间反转重构信号与原始激励信号相似程度均很高,不能表征结构中的损伤;而增大激励幅值至某一阈值后,损伤路径上的损伤指数明显增大,而完整路径上的损伤指数变化不明显;利用该方法准确地识别与定位了板中损伤。
[Abstract]:The matrix cracking and delamination will occur when the composite structure is subjected to impact. Usually, the damage interface keeps close contact, and the strain produced by the stress wave is minimal under small value excitation. The damage interface is still in a closed linear state, and the time reversal reconstruction signal can not indicate the existence or not of the damage. In order to solve this problem, the time reversal method with different amplitude excitation is used to detect and identify the damage. The damage index is constructed by using the correlation coefficient between the time reversal reconstruction signal and the excitation signal. Experimental research on damage identification and location of composite plate based on piezoelectric actuator / sensor array is carried out. The experimental results show that:. The whole path of actuation-sensing and the time reversal reconstruction signal on the damage path are similar to the original excitation signal under small excitation. The damage in the structure can not be characterized; However, when the excitation amplitude reaches a certain threshold, the damage index on the damage path increases obviously, but the damage index on the complete path does not change obviously. This method is used to accurately identify and locate the damage in the plate.
【作者单位】：武汉大学工程力学系;
【基金】：国家自然科学基金项目(51378402)资助
【分类号】：TB33
【正文快照】： 先进的复合材料广泛应用于航空航天、汽车工业等领域中。复合材料结构受到低速冲击时会产生基体开裂、层脱等损伤而引起结构强度降低,对后续安全使用造成威胁。因此对复合材料结构进行有效的损伤检测和健康监测具有重要意义,并已经成为目前的研究热点[1-3]。Lamb波由于传播距

【相似文献】