关键词: 复合材料气瓶, 铺层设计, 渐进损伤, 爆破压力, Hashin准则

Abstract: In this paper, the lay-up design, simulation analysis and burst test of 70 MPa carbon fiber fully wound cylinders with plastic liner are studied. Firstly, the lay-up design of the plastic liner cylinder is carried outbased on the grid theory. Then, the cylinder liner model and composite layer model were established by ABAQUS. The composite material properties of cylinder body and dome position were defined by UMAT subroutine, and the progressive damage model was defined based on Hashin damage theory to predict the burst pressure. Finally, the cylinder burst test is carried out, and the strain of the cylinder is collected by the strain gauge during the experiment. The results show that since the Young's modulus of plastic material is far less than that of composite material, there is no tensile yield situation, and the stress is three-way compressive stress. Plastic liner composite cylinders are also not self-reinforcing through the "self-tightening" process. The deviation between the predicted burst pressure and the test is less than 10%. The predicted burst position is consistent with the test results. The blasting mode of gas cylinders can be predicted by the relationship between axial displacement, radial displacement and pressure, and the inflection point (sudden change point) of the curve can be selected as the blasting load value. The main reason is that the damage of materials leads to stiffness degradation, which leads to the sudden change of macro displacement.

Key words: composite gas cylinder, lay-up design, progressive damage, bursting pressure, Hashin failure criterion