橡胶粘结颗粒材料粘弹性性能的试验研究与离散元模拟  

Experimental Study and Discrete Element Simulation on the Viscoelastic Properties of Rubber-bonded Particulate Material

作　　者：张江涛[1,2] 易廷军 张梅 刘立胜[1,2] 翟鹏程 张清杰[3] Jiangtao Zhang Tingjun Yi Mei Zhang Lisheng Liu Pengcheng Zhai Qingjie Zhang(Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics, Wuhan University of Technology, Wuhan , 430070 Department of Engineering Structure and Mechanics, School of Science, Wuhan University of Technology, Wuhan , 430070 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan , 430070)

机构地区：[1]武汉理工大学新材料力学理论与应用湖北省重点实验室,武汉430070 [2]武汉理工大学理学院工程结构与力学系,武汉430070 [3]武汉理工大学材料复合新技术国家重点实验室,武汉430070

出　　处：《固体力学学报》2017年第5期416-425,共10页Chinese Journal of Solid Mechanics

基　　金：国家自然科学基金青年基金项目(11202154)资助

摘　　要：制备了颗粒规则四方排列和六方排列的橡胶粘接颗粒材料试样,实验测试了所制备试样在单向拉伸载荷下的应力松弛曲线和不同应变率时的应力应变曲线.基于所测试的应力松弛曲线,采用曲线拟合方法得到了所测试材料的宏观Burger’s粘弹性本构模型参数.采用离散元模型中单元间连结模型代表颗粒间橡胶粘接剂的作用,并基于试样的宏观Burger’s模型参数与离散元模型中细观Burger’s连结模型参数间的关系,建立了橡胶粘接颗粒材料的无厚度胶结离散元分析模型.最后采用所建立的离散元模型计算了所测试试样的松弛和拉伸力学性能.离散元预测结果与实验结果的对比表明,采用无厚度胶结离散元模型能较好的计算颗粒规则排列的橡胶粘接颗粒材料松弛和拉伸力学性能,但基于应力松弛实验拟合而来参数不能准确反应橡胶粘接剂在高应变率条件下其力学性能的应变率相关性.The discrete element method（DEM）is used to simulate the viscoelastic properties of rubber-bonded particulate material,and is verified by comparing the simulation results with experimental data.The rubber-bonded particulate material specimens with regular square particle arrangement and hexagonal particle arrangement are fabricated.The stress relaxation curves under constant tension and the tensile stress-strain curves at different strain rates are obtained.Burgers＇ viscoelastic model is used to characterize the mechanical properties of the tested rubber-bonded particulate material,and the model parameters are determined through curve-fitting with the stress relaxation data.The discrete element models with the same particle arrangements as the tested specimens are constructed and used to simulate the viscoelastic behavior of rubber-bonded particulate material under uniaxial tension.The rubber binder is represented by the micro-scale Burgers＇ viscoelastic bond model at contacts between the disk elements,the parameters of which are calculated from the macro-scale Burgers＇ viscoelastic model of the tested specimens.The stress relaxation curves and tensile stress-strain curves are obtained using the discrete element models,and the model predictions are compared with the experimental results.It is shown that the discrete element model predictions are consistent with the experimental results for the specimens with regular particle arrangements,but the Burgers＇ model parameters fitted from the stress relaxation data cannot accurately represent the strain-rate dependence of rubber binder under high-strain-rate deformation.

关 键 词：橡胶粘接颗粒材料 离散元 粘弹性本构模型 应力松弛 单向拉伸 

分 类 号：O341[理学—固体力学]