含不同形状分层缺陷蜂窝夹层板的压缩性能

Compression properties of honeycomb sandwich plates with different shape delamination defects

对含面板/夹芯界面中央分层缺陷复合材料蜂窝夹层板的压缩性能进行了试验研究和理论分析,考察了一种圆形分层和2种矩形分层缺陷对其压缩强度的影响,并采用子层局部屈曲模型对压缩强度进行了计算。结果表明:无缺陷夹层板表现为总体失稳破坏,而对于含分层缺陷的夹层板,则视分层形状及其大小的不同而表现出不同的破坏机制。对于矩形缺陷的长边与载荷方向垂直的夹层板,一般情况下面板子层局部屈曲对夹层板的最终破坏不起控制作用;对于矩形缺陷的长边与载荷方向平行的夹层板,表现为总体失稳破坏。压缩破坏过程中,面板子层屈曲起控制作用的夹层板,子层局部屈曲模型能够比较精确地预测其压缩强度。

The compressive properties of composite honeycomb sandwich plates containing interface delamination defect between the facesheet and the core at the plate center were experimentally studied and theoretically analyzed.The influence of one circular delamination and two rectangular delamination defects on the compressive strength was discussed.A sub-laminate local buckling model was used to estimate the compressive strength of the sandwich plates.The results show that general buckling of the sandwich plates without any defects causes the final compression failure.But for the sandwich plates with delamination defect,there are different failure mechanisms with different delamination shapes and sizes.In general,facesheet local buckling cannot play a controlling role in the sandwich plate failure when the long side of the rectangular defect is vertical to the load direction.While the plate exhibits general buckling failure when the long side of the rectangular defect is parallel to the load direction.The sub-laminate local buckling model is effective to predict the compressive strength of the sandwich plate containing delamination defect while the facesheet local buckling acts as a controlling factor.