Abstract：The evolution of micro-cracks in a lamina of composite laminates is studied by using double-linear characteristic model of damage. With the representation of crack-effect coefficients for elastic moduli, a set of ordinary differential equations about crack-effect coefficients are derived. Furthermore, the relations of dissipated power with crack-effect coefficients are also presented during the cracking process. Together with the dynamic governing equations of a composite laminate, these ordinary differential equations can be solved when initial conditions are known, yielding the crack-effect coefficients. Hence the micro-cracks’ expanding in every point of a lamina and its effect to elastic moduli can be obtained. Subsequently, the distribution regions of micro-crack after impact are predicted by examining whether any of crack-effect coefficients is changed at all points in the lamina. The result shows that the elastic moduli start to decay in the point where the stress reaches its yield strength, and the decaying amplitude increases as the initial impact speed of iron ball being raised. With all boundaries being clamped, the distribution regions of micro-crack appear initially both near the impact point and near the center of boundaries of composite laminates. Moreover, they expand as the initial impact velocity being raised
张思进;文桂林. 低速碰撞下复合材料叠层板的微裂纹演化及其对弹性模量的影响[J]. , 2012, 31(1): 167-172.
Zhang Si-jin;Wen Gui-lin. Evolution of micro-cracks in composite laminates and the effect to elastic moduli under low velocity impact. , 2012, 31(1): 167-172.
2012, Vol. 31 
