液体火箭发动机金属软管网套承载特性研究

Investigation on the structural characteristics of the weave net of metal flexible joint used in liquid rocket engine

为了研究液体火箭发动机柔性金属软管编织网套的增强机理,开展了网套拉伸试验,并基于APDL建立了网套建模及非线性有限元分析参数化程序,数值计算与试验结果一致性较好。研究了承压状态下编织网套对金属软管的增强机理及相互作用模式,建立起网套径向位移与周向应力、等效压力以及摩擦阻力的耦合关系,给出了基于有限元解定量评估网套增强能力及校核网套强度的理论分析方法。研究表明,在金属软管承压10MPa时,网套可分担约20%的内压载荷,网套处于弹性变形状态,铠装环与网套接触摩擦引起的附加轴向力超过50kN。

In order to investigate the enhancement mechanism of weave net which is used as the enhanced part of the flexible metal hose of liquid rocket engine, the tensile tests were conducted.Based on the APDL language, the modeling and nonlinear finite element method(FEM) analysis were fully programmed.The computational results agreed well with the tensile test results, which proofed that the model and analysis methods were reasonable and feasible.The mutual effects between weave net, bellows and armoured ring under internal pressure were obtained, as well as the enhancement mechanism.The theoretical analysis methods based on FEM results were proposed to analyze the enhancement capacity quantitatively and check the intensity of the weave net, which established the relationships between the radial displacements, hoop stress, equivalent pressure, and frictional resistance.Results shows that the weave net can share 20% of internal pressure 10 MPa, and weave net is in the state of elastic deformation.The additional frictional force caused by contact between weave net and armoured ring is more than 50 kN, which may increase the burden of servo mechanism.