几何非线性对整体壁板断裂参数的影响分析

Fracture Parameters Analysis for Nonlinear Geometric of Integrally Stiffened Panel

基于有限元法和断裂力学理论,借助有限元软件ABAQUS计算了某整体壁板纵向裂纹的J积分。考虑了几何非线性,并与未考虑几何非线性所得结果进行了对比,对于不同的内压下以及不同蒙皮厚度情况下的结果进行了分析,结果表明几何非线性对机身壁板纵向裂纹裂尖J积分有明显的影响。

The J-integral values,with consideration of linear and nonlinear geometry,for the longitudinal crack in the integrally stiffened panel are calculated,which is based on the fracture mechanics and finite element analysis.The differences between linear and nonlinear results are focused in this paper.The J-integral values for different thickness and different internal pressures are also studied.The conclusion is that the consideration of nonlinear geometry has significant effect on the J-integral value of the longitudinal crack in the integrally stiffened panel.