锰铜阻尼合金的非线性力学特性特征参数确定方法OA北大核心CSTPCD

The variation law of the characteristic parameters of nonlinear mechanical properties of Mn-Cu damping alloy has been widely studied.However,how to accurately describe the nonlinear mechanical behavior through simulation and optimize the design of structural parts are the prerequisite and the key of its engineering application research.In this paper,based on hyper-elastic model and parallel rheological framework(PRF),typical nonlinear mechanical properties of twin type damping alloy materials is described.The discussion is focused on uniaxial tensile test and dynamic mechanical analysis(DMA)test to determine the characteristic parameters of PRF model methods.First of all,through uniaxial tensile test data fitting,the hyper-elastic model parameters are obtained;based on the multi-strain DMA frequency sweeping test,the linear viscoelastic Prony series model is obtained by fitting the test data.Then,the linear viscoelastic model parameters are transformed into the initial parameters of the nonlinear PRF model.Combined with the hyper-elastic model,the parameters of PRF model are optimized by using Isight software,and the nonlinear characteristic parameters of mechanical properties of Mn-Cu damping alloy are determined.Finally,the reliability of the nonlinear mechanical model of Mn-Cu damping alloy in practical simulation application is verified by frequency sweep test and simulation comparison of an Ω-shaped Mn-Cu damping alloy bearing.The results show that the PRF model can better simulate and calculate the nonlinear dynamic mechanical behavior of Mn-Cu damping alloy,and provide higher precision simulation results for the structural design of Mn-Cu damping alloy.