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

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.