冲击荷载下纤维砂浆动态受压特性  

Dynamic compressive properties of fiber mortar subjected to impact load

作　　者：田正宏[1] 江桂林 苏伟豪 倪军[2] TIAN Zhenghong;JIANG Guilin;SU Weihao;NI Jun(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Sinohydro Bureau Seventh Co., Ltd.,Chengdu 6 1 0 0 8 1,China)

机构地区：[1]河海大学水利水电学院,南京210098 [2]中国水利水电第七工程局有限公司,成都610081

出　　处：《振动与冲击》2018年第1期90-97,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金(51279054)

摘　　要：采用霍普金森压杆冲击试验,系统研究了掺超高分子量聚乙烯(UHMWPE)、聚乙烯醇(PVA)新型纤维砂浆动态受压力学性能;对比纤维砂浆破坏过程的应力-应变曲线,分析应变率和纤维种类对砂浆强度及韧性影响。研究表明:UHMWPE纤维砂浆的综合性能最优,日产PVA纤维砂浆次之,国产PVA纤维砂浆略差。基于传统损伤黏弹性理论,提出了纤维砂浆的简化四参数本构模型;与试验结果比较表明,该简化模型能够很好地模拟纤维砂浆的冲击动态压缩应力应变关系。The split Hopkinson pressure bar impact test was used to systematically study the dynamic compressive properties of fiber mortar doped with ultra-high molecular weight polyethylene（ UHMWPE） and polyvinyl alcohol（ PVA）.The effects of strain rate and fiber type on mortar ＇s strength and toughness were analyzed according to the stress-strain curves during the specimen ＇s failure process. The results show that the comprehensive performance of UHMWPE fiber mortar is the best,that of the Japanese PVA fiber mortar is the second,and that of the domestic PVA fiber mortar is slightly poor. A simplified constitutive model with four parameters of the fiber mortar was proposed based on the theory of traditional viscoelastic damage. Comparing with test results,it is shown that the model can well simulate the dynamic compressive stress-strain relationship of the fiber mortar subjected to impact load.

关 键 词：UHMWPE纤维 PVA纤维 纤维砂浆 动态力学特性 本构模型 

分 类 号：TU528[建筑科学—建筑技术科学]