塑料内胆复合材料气瓶有限元分析与爆破试验

Finite element analysis and burst test of composite cylinder with plastic liner

本文针对塑料内胆70 MPa碳纤维全缠绕气瓶进行铺层设计、模拟仿真分析与爆破试验研究。首先,基于网格理论对塑料内胆气瓶进行铺层设计;接着,采用ABAQUS建立气瓶的内胆模型与复合材料层模型;然后,通过UMAT子程序定义了气瓶筒身段与封头位置复合材料属性,基于Hashin损伤理论定义了渐进损伤模型,用于预测气瓶爆破压力;最后,对气瓶进行了爆破试验,并在试验过程中使用应变片采集了气瓶加载过程中的应变情况。结果表明,渐进损伤模型预测的爆破压力与试验结果的误差在10%之内,且预测的爆破位置与试验结果一致。

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.