关键词: 缠绕复合材料壳体；低速冲击；剩余强度；冲击部位；初始内压；冲头尺寸

Abstract: In order to study the effects of different factors on the residual strength of filament wound composite shell after low velocity impact， drop-weight and water burst tests were carried out on the shell with different energy levels and different impact locations. Modified Hashin criterion and traction separation criterion were used to simulate the intralaminar damage and interlaminar damage， respectively. A finite element model was established for residual strength analysis of shell after impact. The requirement of integrated residual strength analysis after low-velocity impact was realized. The residual strengths after low-velocity impact of filament wound composite shell obtained from this model were well agreed with the experimental results. Then， the model was used to study the effects of impact location， initial internal pressure and impactor size on the residual strength of shell. Research results show that the most serious impact location is at the equator circle of dome. When the impact energy is 25J， the residual strength of shell after impact at this location is reduced about 60%. The residual strength of shell is increasing with the internal pressure added， while the residual strength will be reduced when the internal pressure is greater than 16MPa. The residual strength of shell will be decreased with the reduction of the impactor diameter when it is changed between 8mm and 16mm.

Key words: Filament wound composite shell；Low-velocity impact；Residual strength；Impact location；Initial internal pressure；Impactor size