层板脱层的能量释放率分析

含脱层的层板在承受压缩载荷作用时,很容易发生局部屈曲,导致脱层扩展和结构失效.本文利用可动边界变分问题对脱层扩展进行了分析,导出了脱层前缘各点处的能量释放率表达式.本文还对浅部椭圆脱层进行计算分析,指出:其能量释放率沿脱层边界有很大变化,脱层的扩展方向取决于脱层的形状、受载方式及铺层方向.

ANALYSIS OF ENERGY RELEASE RATE FOR DELAMINATION IN LAMINATES

The local buckling may occur in delaminated laminates under compression.This often causesdelamination growth and structure failure.In this paper,delamination growth is studied by using thevariational method of moving boundary,and the formulas of energy re(?)ease rete G along the delaminationfront are obtained.The near-surface elliptical delamination are olso discussed.There is a large variationof G along the delamination front.The direction,in which delamination growth may occur,depends ondelamination aspect ratio,the applied strain and orientation of plies.