Stochastic prediction of burst pressure in composite pressure vessels

摘要

The main objective of this research is to predict burst pressure of composite pressure vessels subjected to internal pressure taking into account manufacturing uncertainties. Firstly, first-ply-failure (FPF) of composite pressure vessels with/without liner is studied comparing performance of different failure criteria. Then, burst pressure of the vessels are deterministically predicted using progressive damage modeling based on continuum damage mechanics approach. Both theoretical modeling approaches on predicting FPF and burst pressure are validated using available experimental data. Finally, stochastic modeling is conducted to estimate burst pressure of composite pressure vessels taking into account fiber volume fraction, winding angle and mechanical and strength properties as random parameters resembling manufacturing-induced inconsistencies. Statistical data analysis shows the importance of taking into consideration manufacturing variability.