基于RVE方法的炭黑填充黏弹性材料力学行为研究

RESEARCH ON MECHANICAL BEHAVIOR OF CARBON BLACK FILLED VISCOELASTIC MATERIALS USING RVE METHOD

黏弹性材料在消声降噪、精密仪器减振和建筑结构防震减灾等领域存在较多应用。炭黑、白炭黑等填料体系是黏弹性材料的重要组成部分。该文采用随机序列吸附方法,建立了不同体积炭黑填充黏弹性材料的代表体积单元(RVE)模型,基于有效体积分数对有限元模型进行修正,从细观尺度对不同体积分数炭黑填充黏弹性材料的弹性力学行为和动态耗能指标进行了计算分析,与经验值和试验结果进行了对比验证。结果表明:采用有效体积分数建模时,RVE方法计算得到不同体积分数下炭黑填充黏弹性材料的应力-应变曲线、动态耗能指标均能与试验和理论结果较好吻合。

The viscoelastic materials have many applications in the fields of noise reduction,of vibration control for precision instrument,and of earthquake prevention and,of disaster reduction for building structures.Filling systems such as carbon black and silicon are important components of viscoelastic materials.Thusly,the random sequence absorption method is used to establish representative volume element(RVE)models of carbon blackfilled viscoelastic materials with different volume fractions,and the finite element model is modified upon the effective volume fraction.The mechanical behavior and dynamic energy dissipation index of the carbon blackfilled viscoelastic material with different volume fractions is calculated and analyzed at mesoscale,and it is also compared with empirical values and test data.It shows that the stress-strain curve and dynamic energy dissipation index of the carbon black-filled viscoelastic material with different volume fractions calculated by the RVE method are in a good agreement with the experimental and theoretical results when utilizing effective volume fraction to build the models.