Study On The Damage And Residual Burst-pressure Of COPV After Impact

Filament-wound composite pressure vessel (COPV) has a broad applicationprospect for its good property, especially in the field of aerospace which has been usedto contain high-pressure liquid fuel for its great specific strength and good security.COPV is very sensitive to impact, and it is easily damaged during its processing or usefor impact. However, it’s difficult for traditional research method to deal with theproblem of structural analysis of anisotropic materials. With finite element theory andcomputer technology are continuously improved, numerical analysis method hasbecome a strong means in the field of structural designing and performance study ofCOPV. In addition, numerical analysis method is a cheaper and more time-savingmethod compared with experiment.In addition to classical mechanics analysis, experimental research and ABAQUSsoftware are applied on the study of impact damage and residual burst-pressure underdifferent impact energy.（1）Based on the research achievements home and abroad, classical mechanicstheories on the structural analysis of COPV are summarized and analyzed. Grid theorymethod is used to compute the burst-pressure.（2）Related experiments are applied to research the impact damage and theresidual burst-pressure of COPV. In order to characterize the damage level, two relatedtests are implemented. In the hydrostatic test, the burst-pressure of the COPV which hasbeen impacted or not is derived. The impact test results show that the energy thresholdfor fiber damage is between10-20J, and10J impact energy has no effect on the residualburst-pressure while the burst-pressure will drop from79MPa to77MPa and75MPacorrespondingly when the impact energy are20J and30J.（3）ABAQUS software based on finite element method is applied to simulateimpact damage and residual burst-pressure of COPV. In this part, finite element modelis made basically allowing for the real state in order to obtain more accurate resultcompared to the test correspondingly. The overall simulation result error is smaller than10%. In addition, the affect of the filament thickness on the mechanics property ofCOPV is studied.