Based on the nonlinear structure characteristics caused by different defects under harmonic excitation, the recursive quantitative analysis(RQA) was used to quantify the damage of matrix microcracks in composite materials.The composite laminates with different crack damages under different external loads were taken as the test object, and the Lamb wave signals in the path near the damage region were analyzed with recursive plots and quantitatively characterized with RQA parameters.Based on the Euclidean distance between RQA eigenvectors, a united damage index (UDI) was proposed to quantify the deviation of damage state relative to intact state.The experimental analysis verified that the proposed UDT has the sensibility to the matrix microcracks and linearly increases with the damage degree.It could be used as an effective and feasible method for quantitatively evaluating the matrix micro cracks in composite laminates.
刘小峰 杨康俊 柏林. 基于Lamb波递归量化分析的复合材料裂纹损伤定征研究[J]. 振动与冲击, 2019, 38(10): 250-255.
LIU Xiaofeng, YANG Kangjun, BO Lin. Crack damage investigation of composite materials based on theLamb wave and recursive quantitative analysis. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(10): 250-255.
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