复合材料板分层损伤识别的曲率模态差法

Curvature Mode Difference of Damage Identification of Laminated Composite Plate

以单侧固支的分层损伤复合材料层合板为研究对象,利用有限元分析软件ABAQUS得到层合板结构振型位移分析数据,针对分层损伤进行了曲率模态分析。分析结果表明,在层板内一个区域存在分层损伤的情况下,其振型与频率的变化非常小,难以用于判断损伤位置,但分层损伤区域的曲率模态差值变化显著,采用曲率模态差法可以对层合板结构分层损伤位置进行准确判定。

The curvature modes of a laminated composite plate which is clamped in the cantilever configuration are derived from its displacement modes obtained by using the commercial finite element program ABAQUS.Analysis results show that the displacement modes and the frequency change too little to identify the embedded delamination location in the laminated composite,while the curvature mode difference of the delamination area changes obviously.Therefore,the location of the embedded delamination can be detected exactly by using the method of curvature mode difference.