固体火箭技术Issue(4)：585-590,6.DOI:10.7673/j.issn.1006-2793.2015.04.025
基于模态柔度的复合材料梁层间损伤识别试验研究
Experimental study on identification of interlaminar damage in composite beams based on modal flexibility
摘要
Abstract
In this paper,the change ratio of modal flexibility curvature MFCI of composite beam modal was used to discuss the NDT method of composite materials.Firstly, the first three natural frequencies and acceleration amplitudes of the composite beam were tested and calculated through hammering method.Then acceleration amplitude was exchanged to modal displacement amplitude with the method of spectrum conversion.The interlaminar damage of composite beam was detected by calculating the MFCI.The four groups of samples considering damage size,damage location and damage layers were designed and made.The experimental results show that the MFCI 5.200 6 of the damage unit is significantly higher than the average MFCI 0.720 5 of the Non⁃damage unit,the value of abscissa reflects the damage location and mutated spacing shows the size of damage;the MFCI of damage in three different layers are 5.200 6,5.982 8 and 6.883 0,which can indirectly reflect the damage occurred in different interlaminar position.In the multiple damage cases,the damage location can be indentified,but the average value of MFCI 1.192 is much smaller than 5.294 in the single damage case. Due to mutual interference,the multiple damage weakenes the efficiency of damage identification.The exper⁃imental results prove that the method of the change ratio of modal flexibility curvature has the significant effect on the judgment of composite beam interlaminar damage.关键词
复合材料梁/层间损伤/模态柔度曲率改变率/试验研究Key words
composite beam/interlaminar damage/change ratio of modal flexibility curvature/experimental study分类
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杨涛,于湛卉,牛雪娟,杜宇..基于模态柔度的复合材料梁层间损伤识别试验研究[J].固体火箭技术,2015,(4):585-590,6.基金项目
国家自然科学基金（11372220）；教育部留学回国人员科研启动基金。 （）
