克服纤维桥连对GIC影响的隔离层法

本文分析了纤维桥连产生的原因和它对Ⅰ型层间断裂韧性G_IC的影响,提出了一种克服纤维桥连的“隔离层”法,从试件铺层设计入手,力图将纤维嵌套的可能性减到最低.有限元计算结果表明,隔离层的引入并没有改变层间裂纹尖端的应力分布和应力集中,试件的弯曲刚度计算表明,当隔离层的铺层角取±10°～±20°时,可以使±θ隔离层带来的试件弯扭耦合效应降到最低.实验结果证明了这种方法的可行性.

METHOD OF ISOLATED LIES FOR OVERCOMING THE EFFECT OF FIBER BRIDGING ON G_(IC)

The cause of fiber bridging and its effect on the mode I interlaminar fracture toughness GIC are discussed and the method of isolated plies for overcoming the effect of fiber bridging is put forward in this paper.By changing the ply design of specimens,the possibility of fiber nesting is reduced to the lowest level.The calculation by FEM shows that the use of isolated plies does not change the distribution and concentration of stress in the tip of the interlaminated crack.The calculation of flexural rigidity of the specimens shows that if the ply angle of the isolated plies is ±10°~±20°,the flex-torsion coupling of specimens will be reduced to a minimum.The feasibility of this method is proved by experimental data.