The mechanism of the deflection torque of the flexible joint decrease with enhancing pressure has never been resolved. Just say the shear stress has changed can not be convincing. The structure of the flexible joint are analyzed, the real reason for the deflection torque of the flexible joint decrease is that it would be buckling when it bearing the deflection and pressure at the same time. The risks method is analyzed and used in this paper, the buckling process of the flexible joint is simulated by ABAQUS. The risks method and static general method are used to simulate the different processes of different pre-angle with enhancing pressure, the rules of pendulum angle changing with the enhancing pressure are got. The spring torque is got and had a good coherence with the test results. The method and conclusion in this paper will provide the beneficial reference for the design of the flexible joint in high-pressure work environment.%高压下柔性接头摆动力矩减小的原因一直未得到确切解答,只归结到剪应力分布的变化很难让人信服.通过对柔性喷管中柔性接头结构形式的特点进行分析,认为随压强升高摆动力矩减小的根本原因为柔性接头的屈曲响应.分析了弧长法的原理以及其在屈曲分析中的应用,通过数值计算软件ABAQUS开展对柔性接头屈曲过程的仿真分析.分别通过通用静力算法和弧长算法对不同预摆角下承压过程进行模拟,得到摆角随压强的变化规律.计算结果表明:不同压力下的弹性力矩与实验结果对比,一致性较好,所用方法和结论可以为柔性接头高压工作环境下的设计提供有益参考.
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