约束开裂复合材料层板的裂纹密度计算与斜交铺层处理

CALCULATION OF CRACK DENSITY AND MANIPULATION OF ANGLE-PLIEDLAMINA FOR COMPOSITE LAMINATES WITH CONSTRAINED CRACKING

对约束开裂复合材料层板给出随裂纹密度变化的刚度衰减公式。构造了裂纹密度与损伤区应力的关系函数，借助这一函数可由损伤区应力直接预测其刚度衰减。引入两次转轴变换方法，将刚度衰减公式由９０°基体开裂推广到应用于±θ层的基体开裂。

Stiffness degradation formulas are given for a composite laminate with constrained cracking.Because the formulas are expressed as a function ofcrack density,the relation between crack density and stresses in the damage zone is constructed so as to predict the stiffness degrada- tion directly from the stress distribution in damage zone. The generalization of the stiffness deg- radation formulas is made for any angle-plied lamina by rotating the coordinate axes twice.