残余应力与胶粘剂对ARALL层板疲劳裂纹扩展特性的影响

EFFECTS OF RESIDUAL STRESS AND ADHESIVE ON FATIGUE CRACK GROWTH OF ARALL

研究了胶粘剂性质、含量及残余应力状态对纤维－铝合金胶接层板（ＡＲＡＬＬ）疲劳裂纹扩展特性的影响，分析了裂纹扩展过程中的分层状态的变化结果表明，ＡＲＡＬＬ层板内富胶层的剪切形变和伴随裂纹扩展的分层区越大，即这两方面耗散能量越多，则疲劳裂纹扩展速率越低；胶粘剂含量的影响不明显．给层板施加预应力极大降低了层板的疲劳裂纹扩展速率．其本质在于裂尖在同样的疲劳载荷下实际所受到的有效应力降低．

he influences of the residual stress. adhesive properties and adhesive content on the fatigue crack growth of the super-hybrid composite ARALL have been investigated, and the delamination with the crack propegation has ben analysed in this paper. The results show that influences on the fatigue crack growth rate by adhesive are depended on the shear deformation of the pert of resin-rich inside ARALL and the delamination with the crack growth, the more the energy dissipated by the two part is, the lower the crack growth rate is. The effect by the content of adhesive is not evident. Applying pre-stress to laminate decreases the crack growth rate, and the essence is that the effective stress in crack tip is reduced under the same fatigue load.