某T1000级碳纤维缠绕复合材料壳体承压特性

Pressure-sinkage characteristics of a T1000 carbon fiber wound composite case

为探究T1000级高压强复合材料壳体承压力学特性,本文开展了国产T1000级碳纤维复合材料宏观力学性能横向对比测试,并以此为基础完成复合壳体材料选型,根据工艺铺层信息,结合3次样条厚度预测方法及非测地线缠绕角计算方法,实现壳体的高保真有限元建模,并基于渐进损伤分析方法,对复合壳体封头应力应变响应、复合壳体损伤演化过程、失效模式及爆破压强进行预示,最终通过液压强度试验验证了计算模型的准确性。结果表明:国产T1000碳纤维性能与东丽T1000G相当,且拓展CCF1000S综合性能表现最佳;封头段由壳体与金属接头段刚度不连续引起的变形不协调使该区域受弯曲、拉剪耦合作用,进而导致封头肩部应力水平明显高于两侧;基于三维Hashin损伤准则的渐进损伤模型能有效地描述壳体损伤与失效过程,更能准确地预测壳体爆破压强及破坏位置。

In order to study the pressure-sinkage characteristics of T1000 carbon fiber reinforced composite case,transverse comparative tests of macroscopic mechanical properties of domestic T1000 carbon fiber composite were carried out in this paper.On the basis,the selection of the composite materials was implemented.The high precision finite element model of the composite case was established based on the layup in the process,cubic spline thickness prediction method and non-geodesic theory.The stress-strain response of the composite case dome was calculated,and the damage evolution of the composite case,the failure mode and the burst pressure were predicted based on the progressive damage analysis method.Finally,the simulation model was validated by hydraulic tests.The results show that the performance of domestic T1000 carbon fiber is equivalent to Toray T1000G,and the comprehensive performance of CCF1000S is the best.The deformation disharmony caused by the stiffness discontinuity between the case and the metal boss makes the dome part subject to the coupling effects of bending,tension and shear,which results in the stress level of the dome shoulder being obviously higher than that on both sides.The progressive damage model based on the 3D Hashin damage criterion can effectively describe the damage and failure process of the case,and predict the bursting pressure and failure location of the case more accurately.