Failure criterion and durability characteristics of metal rubber under static compression load

Metal rubber(MR) is widely applied in vibration control, vibration isolation and shock resistance areas because of its characteristics of elasticity, damping, reliability and adaptation to the operational environment. It is critical for the system safety to accurately define the failure criterion and forecast the failure of MR in engineering. The failure criterion and durability property of MR under long-term static compression load were studied through the experimental method. The result shows that it is feasible to determine the MR failure by the structure deforming factor and mechanical property decaying factor, besides, the failure status and durability life can be determined by confirming the thresholds of these factors. The failure criterion factors of MR shows multi-stage property varying with loading time,denoting the change of MR inner micro structure and forced state with continuous loading time. In the test result of this paper, the metal rubber specimens exhibit no deforming failure under different static load status. However, under larger static load condition, the durability life of MR can be greatly decreased, resulting in excessively large tangent modulus decaying factor and obvious failure of MR mechanical properties.