缠绕复合材料壳体爆破压强的预测

Burst pressure prediction of filament wound composite shell

针对缠绕复合材料壳体在内压作用下的破坏问题,基于连续损伤介质力学方法,建立了一种缠绕复合材料渐进损伤破坏分析模型。模型中考虑了纤维破坏、基体损伤和纤维/基体开裂3种破坏模式,并针对缠绕复合材料面内剪切非线性的实际,建立了面内剪切非线性模型。通过子程序UMAT将模型嵌入ABAQUS/Standard中,对含缺口缠绕复合材料试件拉伸过程进行了仿真计算,验证了模型的正确性。采用该模型对缠绕复合材料壳体的水压破坏过程进行了仿真分析,结果表明:内压作用下缠绕复合材料的最终破坏是由于纤维断裂导致的,且纤维破坏主要出现在环向层,基体破坏主要出现在纵向层。

For the burst failure mechanism of filament winding composite pressure shell,aprogressive failure model based on continuum damage model was proposed.Fiber breakage,matrix damage and fiber/matrix deboned were considered in this model.Nonlinear shear damage was taken into account as the intra-lamina mechanics of filament wound composite was different with composite plate.The model was implemented into ABAQUS/Standard through UMAT subroutine and used to simulate the tension failure of notched wound composite specimens.The burst failure process of wound composite shell was simulated.The result showed that the ultimate failure of the wound composite shell was induced by fiber breakage.Fiber breakage mainly occurred in hoop layers and matrix damage mainly occurred in helical layers.