A mechanical calculation model for the nonlinear mechanical behavior of the metal rubber clamp in aero engine

As an important pipeline support component, metal rubber clamp is mainly used for pipeline connection, fixation and vibration isolation. At present, the researches on hysteretic and stiffness characteristics of metal rubber clamps in aero engines are still in their infancy. This work aims to develop a nonlinear mechanical calculation model for metal rubber clamps to effectively capture the nonlinear mechanical properties, such as hysteresis characteristics and variable stiffness behavior. The equivalent stiffness model of metal rubber clamps was established by introducing tightening torque and friction between metal wires as control variables, and the mechanical behavior under repeated loads is analyzed by combining the force and deformation relations of typical hysteretic curves. By comparing the measured hysteretic curve and natural frequencies, the proposed equivalent stiffness model of a metal rubber clamp is verified. This also suggests that the proposed model can effectively simulate the dry friction damping characteristics of metal rubber. In addition, the effects of tightening torque and friction coefficient on hysteretic characteristics and stiffness are also analyzed. The aim of this study is to develop mechanical anisotropy tests integrated with equivalent numerical simulation techniques to elucidate the mechanical characteristics of the aero engine clamp. The research can provide theoretical support for the structural design of metal rubber clamps.