ⓒ应用数学和力学编委会,ISSN1000⁃0887http://www.applmathmech.cn计及时变演化特征的硅泡沫垫层非线性黏弹性模型研究∗范志庚,万强,牛红攀,靳凡(中国工程物理研究院总体工程研究所,四川绵阳621900)摘要:基于黏弹性基本理论,引入材料非线性特征,考虑了材料加载、保载应力松弛历史、老化效应以及黏弹性模型各运动单元退化的差异性,并从两种老化机制出发,获得了老化硅泡沫垫层力学模型以及长时应力松弛硅泡沫垫层接续加载力学模型.模型机理清晰,能够反映材料服役历史信息及其对力学效应的影响.关键词:硅泡沫垫层;非线性黏弹性;应力松弛;老化;力学模型中图分类号:O341文献标志码:ADOI:10.21656/1000⁃0887.440249ANonlinearViscoelasticModelforSiliconRubberFoamCushionConsideringTime⁃VaryingEvolutionCharacteristicsFANZhigeng,WANQiang,NIUHongpan,JINFan(InstituteofSystemsEngineering,ChinaAcademyofEngineeringPhysics,Mianyang,Sichuan621900,P.R.China)Abstract:Basedonthecommontheoryofviscoelasticity,themechanicalmodelforagingsiliconrubberfoamcushionandthecontinuousloadingpredictionmodelforlong⁃termstressrelaxationsiliconfoamcushion,wereobtained,inviewofthe2agingmechanisms,thenonlinearmaterialcharacteristics,theloadingprocess,thestressrelaxationhistory,theagingeffectandthedegradationdifferenceofeachmotionelementofviscoelasticmodel.Themechanismofthemodelisclear,anditcanreflec...