基于模态柔度曲率改变率复材简支梁结构损伤识别研究

STUDY OF THE DAMAGE IDENTIFICATION OF COMPOSITE MODAL FLEXIBILITY CURVATURE BEAM STRUCTURE BASED ON THE RATE OF CHANGE OF MODAL FLEXIBILITY CURVATURE

利用复合材料梁的模态柔度曲率改变率MFCI探讨复合材料无损检测方法,应用有限元软件ABAQUS模拟出有损和无损复合材料梁的固有频率和各节点振型位移值并计算出模态柔度曲率改变率值,进而检测出复合材料损伤位置。以检测含不同脱层损伤复合材料简支梁为算例,结果表明在检测复合材料简支梁时,无论是单点脱层损伤还是多点脱层损伤以及脱层损伤大小程度,该方法都能准确检测出含脱层损伤区域的位置,证明了模态柔度曲率改变率法对判断含层间损伤复合材料梁有显著效果。

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. The natural frequency of the lossy,lossless composite beam and modal displacement amplitude of each node are simulated by the finite element software of ABAQUS. And,the interlaminar damage of composite beam were detected by calculating the MFCI. Then,an example of detecting delamination damage of composite materials with different beams is illustrated,and the results indicate that this method of detecting the composite beam can accurately detect the location delamination damage region whether single-point or multi-point delamination damage and the degree of delamination damage. The simulation 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.