锰铜阻尼合金的非线性力学特性特征参数确定方法  

Determination Method of Nonlinear Mechanical Characteristic Parameters of Mn-Cu Damping Alloy

作　　者：张斌 张凌翔 刘艳 熊亚军 ZHANG Bin;ZHANG Lingxiang;LIU Yan;XIONG Yajun(Shanghai Shentong Metro Group Co.,Ltd.,Shanghai 200237,China;Shanghai Research Institute of Materials,Shanghai 200437,China;Shanghai Key Laboratory of Engineering Materials Application and Evalu)

机构地区：[1]上海申通地铁集团有限公司,上海200237 [2]上海材料研究所,上海200437 [3]上海材料研究所上海市工程材料应用与评价重点实验室,上海200437

出　　处：《噪声与振动控制》2024年第3期75-81,共7页Noise and Vibration Control

基　　金：上海地铁维护保障有限公司资助项目(2021WB-KY20R027-1-JYF-02)。

摘　　要：锰铜阻尼合金非线性力学特性的特征变化规律已被广泛研究,但如何通过仿真准确描述其非线性力学行为,并对由其制成的结构件进行设计与优化,是对其进行工程应用研究的前提与关键。基于超弹性模型和并联流变模型(Parallel Rheological Framework,PRF),描述一种典型孪晶型阻尼合金材料的非线性力学特性,重点讨论由单轴拉伸试验和动态机械分析(Dynamic Mechanical Analysis,DMA)试验确定PRF模型特征参数的方法:通过拟合单轴拉伸试验数据得到超弹性模型参数;基于多应变DMA三点弯曲频率扫描实验,通过实验数据拟合得到线性黏弹性Prony级数模型,通过PRF模型进行参数转换,将线性黏弹性模型参数转化为非线性PRF模型初始参数;结合超弹性模型,采用Isight软件对PRF模型参数进行优化,确定锰铜阻尼合金的非线性力学特性特征参数;最后,在Ω型锰铜阻尼合金支座的顶部施加竖向扫频激励,通过扫频试验数据和仿真计算结果对比,验证该锰铜阻尼合金材料的非线性力学模型在实际仿真应用中的可靠性。结果表明,PRF模型可较好模拟锰铜阻尼合金非线性动态力学行为,为锰铜阻尼合金结构设计提供更高精度的仿真结果。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 anΩ-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.

关 键 词：振动与波 锰铜阻尼合金 应变幅值相关性 非线性 有限元仿真 并联流变模型 

分 类 号：TB535.1[理学—物理] O241.82[理学—声学]