A theoretical solution is aimed to be developed in this research for predicting the failure in internally pressurized composite pressure vessels exposed to low-velocity impact. Both in-plane and out-of-plane failure modes are taken into account simultaneously and thus all components of the stress and strain fields are derived. For this purpose, layer-wise theory is employed in a composite cylinder under internal pressure and low-velocity impact. Obtained stress/strain components are fed into appropriate failure criteria for investigating the occurrence of failure. In case of experiencing any in-plane failure mode, the evolution of damage is modeled using progressive damage modeling in the context of continuum damage mechanics. Namely, mechanical properties of failed ply are degraded and stress analysis is performed on the updated status of the model. In the event of delamination occurrence, the solution is terminated. The obtained results are validated with available experimental observations in open literature. It is observed that the sequence of in-plane failure and delamination varies by increasing the impact energy.

本研究旨在开发一种理论解决方案，以预测暴露于低速冲击下的内部加压复合压力容器的故障。同时考虑了面内和面外破坏模式，因此得出了应力场和应变场的所有分量。为此，在内部压力和低速冲击下的复合材料圆柱体中采用分层理论。将获得的应力/应变分量输入适当的故障准则中，以调查故障的发生。如果遇到任何面内失效模式，则在连续损伤机制的背景下，使用渐进式损伤建模对损伤的演化进行建模。即 失效帘布层的机械性能会下降，并且会根据模型的更新状态进行应力分析。如果发生分层，则终止解决方案。获得的结果通过公开文献中的可用实验观察结果进行了验证。观察到，平面内破坏和分层的顺序随着冲击能量的增加而变化。