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通过单轴拉伸与平面拉伸试验,得到了柔性接头弹性件橡胶材料“三阶五项式”超弹本构模型参数,通过有限元计算证明了该模型的优越性。为了获得柔性接头弹性件材料剪切模量随容压的变化规律,设计了双轴加载试验装置和表征柔性接头弹性件的三重片试件,进行了压缩剪切联合加载试验及有限元数值模拟,发现橡胶材料的剪切模量随压强的升高略有增加。数值模拟柔性接头不同压强下的摆动过程,发现随压强升高弹性件的剪应力分布变化明显,这正是随压强升高摆动力矩下降的内在原因。
Through the uniaxial tensile test and plane tensile test, the parameters of the rubber material of the flexible joint elastic member “third-order pentagon ” superlastic model were obtained. The superiority of this model was proved by the finite element analysis. In order to obtain the change rule of the shear modulus of the flexible connector with the change of the external pressure, the biaxial loading test device and the triple-sheet specimen that characterize the flexible connector were designed. The compression-shear combined loading test and finite element numerical simulation It was found that the shear modulus of rubber increased slightly with increasing pressure. Numerical simulation of the flexible joint under different pressure swing process, found that with the pressure increase the elastic part of the shear stress distribution changes significantly, which is the pressure drop with the rise of the inherent causes of oscillatory torque.