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设计了结构尺寸相同,弹性件材料分别为天然橡胶和硅橡胶的小型柔性接头,测试了容压作用下的轴向压缩位移,考察了弹性比力矩随温度(-50～70℃)、容压的变化情况.另外,为检验应力估算经验公式对小型柔性接头的适用性,测试了增强件内侧环向压缩应力.结果表明:柔性接头轴向压缩刚度随容压升高呈现一定程度的非线性增大趋势;弹性比力矩在0°～6°摆角范围内基本恒定,不同柔性接头弹性比力矩随容压升高呈现不同变化趋势;天然橡胶弹性件柔性接头弹性比力矩在低温下显著增大,硅橡胶弹性件柔性接头弹性比力矩在-50～70℃温区稳定;由燃烧室压强引起的增强件环向压缩应力经验公式估算值过大,不适用于小型柔性接头.
The compact flexible joints with the same structure and the same size as the natural rubber and the silicone rubber were designed. The axial compression displacement under the pressure was tested. In addition, in order to test the applicability of the stress estimation empirical formula to the small flexible joint, the circumferential compressive stress inside the stiffener was tested.The results show that the axial compressive stiffness of the flexible joint exhibits a certain degree of non-linearity The elastic specific moment is basically constant within the swing angle range of 0 ° ~ 6 °, and the elastic specific moment of different flexible joints presents different trend with the increase of the pressure-holding capacity. The elastic specific moment of natural rubber elastic member is significantly increased at low temperature Large and elastic rubber joints flexible moment of elasticity in the -50 ~ 70 ℃ temperature stability; by the pressure of the combustion chamber caused by the hoop compressive stress of the ring to the empirical formula estimation is too large, not suitable for small flexible joints.