考虑应变率效应的黏弹性减震材料本构模型  

Constitutive model of viscoelastic damping material considering strain-rate effect

作　　者：李强强 徐赵东[1,2] 陆勇[3] 董尧荣 徐业守 祝陈 LI Qiangqiang;XU Zhaodong;LU Yong;DONG Yaorong;XU Yeshou;ZHU Chen(China-Pakistan Belt and Road Joint Laboratory on Smart Disaster Prevention of Major Infrastructures,SoutheastUniversity,Nanjing 211189,China;School of Civil Engineering,Southeast University,Nanjing 211189,China;School of Engineering,The University of Edinburgh,Edinburgh EH93JL,United Kingdom;School of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;Key Lab of Structural Engineering&Earthquake Resistance of the Ministry of Education,Xi’an University of Architecture&Technology,Xi’an 710055,China)

机构地区：[1]东南大学中国-巴基斯坦重大基础设施智慧防灾“一带一路”联合实验室,江苏南京211189 [2]东南大学土木工程学院,江苏南京211189 [3]爱丁堡大学工程学院,爱丁堡EH93JL [4]西安建筑科技大学土木工程学院,陕西西安710055 [5]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055

出　　处：《建筑结构学报》2022年第7期54-61,共8页Journal of Building Structures

基　　金：国家杰出青年科学基金项目(51625803);教育部长江学者奖励计划;国家重点研发计划政府间国际科技创新合作重点专项(2019YFE0121900);江苏省国际科学技术合作项目(BZ2018058)。

摘　　要：黏弹性减震材料的力学性能直接影响黏弹性装置的减震效果,其力学行为除了具有典型的超弹性特征外,亦会表现出显著的黏弹特性。为了准确描述黏弹性减震材料复杂的力学行为,在已有超弹性力学模型的基础上,构造多项式形式的黏度方程对材料的应变率效应进行表达,建立了相应的材料黏性应变能函数,同时引入流体动力学补强理论以考虑填料的影响,通过理论推导,建立能够考虑应变率效应的黏弹性减震材料本构模型,进而在不同加载应变率下对黏弹性减震材料的应力-应变关系进行了一系列试验研究,并利用试验数据对所建模型的准确性与适用性进行对比验证。结果表明:应变率对黏弹性减震材料的力学性能具有显著的影响,考虑应变率效应和填料补强效应后模型的预测鲁棒性得到了较大的提高,所建模型可在较广的应变范围(0~300%)内对不同应变率下黏弹性减震材料的应力-应变行为进行较为准确的预测。The mechanical properties of viscoelastic damping materials have a direct impact on the damping effect of viscoelastic devices.Their mechanical behavior not only shows typical hyperelastic characteristics,but also indicates significant viscoelastic properties.In order to accurately describe the complex mechanical behavior of viscoelastic damping materials,inspired by the existing hyperelastic mechanical model,the multinomial viscosity equation was constructed to reflect the strain-rate effect of the materials.Subsequently,the corresponding viscoelastic strain energy function was established by introducing the hydrodynamic reinforcement theory to consider the influence of fillers.The constitutive model of viscoelastic damping materials considering the strain-rate effect was addressed through theoretical derivation.Furthermore,a series of performance experiments were carried out to investigate the stress-strain relationship of viscoelastic damping materials under different loading strain rates.The test results were used to verify the accuracy and applicability of the proposed model.The results show that the strain rate has a significant effect on the mechanical properties of viscoelastic damping materials.The prediction robustness of the proposed model has been greatly improved by considering the strain-rate effect and the filler-reinforcement effect.The proposed model can accurately predict the stress-strain behavior of viscoelastic damping materials under different strain rates in a wide range(0-300%)of strain with a good prediction accuracy.

关 键 词：黏弹性减震材料 应变率效应 填料增强效应 力学性能试验 本构模型 

分 类 号：TB535.1[理学—物理]