用三维有限元模型计算复合材料粘接修补裂纹板的J积分

用复合材料单边粘接修补带裂纹金属板是三维应力问题，而采用简化的二维有限元分析模型计算则有一定近似性。本文建立了三维有限元模型，并计算了其断裂参数J积分。计算分析结果表明，厚度方向上J积分值是变化的，并且修补边比未修补边的J积分值有明显减小；修补前后裂纹面的张开位移明显不同；裂纹板模型的J积分值与裂纹长度在修补前为二次关系，修补后，变成线性关系；粘胶和补片的厚度、粘胶的模量对J积分的影响比较显著。为了提高修补性能，需要对粘胶和补片的几何尺寸和材料性能进行优化。

Computation of the J-integral value for single-edge crack sheet with single-side bonded composite patch using 3D finite element model

In this paper,3D finite element analyses are performed to obtain the J integral value of crack repaired by bonded composite patch by considering the 3D stress state of patch crack.The study shows that the J-integral value is varied alone the thickness and the value of unpatched side is much higher than that of patched side.The crack face profile of the patched and unpatched model is quite different.The relationship between J-integral value and crack length is linear in the repaired model while it is quadratic in the unpatched model.The effect of the adhesive properties on the variation of the J-integral value at the crack tip is highlighted.The effects of adhesive and patch thickness on J are also highlighted.In order to increase the performance of the patch repair or reinforcement,the adhesive properties,the thickness of adhesive and patch must be optimized.