复合材料层合板阶梯形挖补胶接修理渐进损伤分析

Progressive damage analysis on composite laminates stepped-patch adhesively bonding repair

建立了复合材料层合板阶梯形挖补胶接修理构型的渐进损伤分析三维有限元模型,同时考虑了复合材料母板、补片和胶层的损伤扩展以及它们之间的相互影响。层合板采用含正交各向异性损伤的连续介质损伤力学(CDM)本构方程进行描述,材料积分点处的损伤状态采用二阶张量形式的内部状态变量表征。胶层采用含各向同性损伤的CDM本构方程进行描述,材料积分点处的损伤状态采用常数形式的损伤变量表示。计算结果与试验数据符合较好,说明该模型可较好预测挖补胶接修理的复合材料层合板拉伸强度及其失效模式。

A three-dimensional（3D） FEM was proposed for the progressive damage analysis（PDA） of the steppedpatch bonding repaired composite laminate. Both of the composite laminate and adhesive damage progressing and acting on each other during the process of failure were taken into account. The laminate was modeled with the constitutive equations of continuum damage mechanics（CDM） in an orthotropic damage with a second-order tensor as the internal state variables to describe the damage status of material points. The adhesive layer was modeled with the constitutive equation ol CDM in an isotropic damage with a constant internal state variable. The good agreement between the results of the proposed FEM and the experiments shows that the proposed FEM could well predict the tensile strength of laminates repaired with bonded stepped-patch and the whole process of repaired laminates failure.