不同长径比聚乙烯醇(PVA)/高延性纤维增强水泥基复合材料(ECC)动态压缩性能  

Dynamic compression property of polyvinyl alcohol(PVA)/engineered fiber reinforced cementitious composite(ECC)with different length-diameter ratios

作　　者：刘泽军[1] 赵柳 李艳[1] 褚颜贵 LIU Zejun;ZHAO Liu;LI Yan;CHU Yangui(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454003,China)

机构地区：[1]河南理工大学土木工程学院,焦作454003

出　　处：《复合材料学报》2023年第12期6859-6870,共12页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(U1904188);河南省科技攻关项目(222102320431);河南省高校基本科研业务费专项资金资助项目(NSFRF220438)。

摘　　要：基于杆径为50 mm的分离式霍普金森压杆装置(SHPB)研究了不同长径比和不同聚乙烯醇(PVA)纤维体积掺量的高延性纤维增强水泥基复合材料(PVA/ECC)在4种应变率下的动态压缩性能。结果表明:长径比较大(l/D>1.0)的PVA/ECC试件冲击压缩后更易产生方向性明显的滑移破坏,其应力-应变曲线平台期的长度明显缩短,且曲线所包围的面积也明显减小;PVA/ECC的动态峰值应力、峰值应变和冲击韧性均随长径比增加而降低,存在一定的尺寸效应,且应变率越高、PVA纤维体积掺量越小,长径比的影响更明显;长径比较大的PVA/ECC试件其应变率效应有所减弱但PVA纤维的强化效应有所提升,尤其是对冲击韧性的影响程度最显著。The dynamic compression properties of engineered fiber reinforced cementitious composite(PVA/ECC)with different length-diameter ratio and different polyvinyl alcohol(PVA)fiber contents by volume subjected to four different strain rates were investigated by using a 50 mm diameter split Hopkinson pressure bar(SHPB).The results show that PVA/ECC specimens with larger length-diameter ratio(l/D>1.0)are more prone to directional slip failure after impact compression damage.Furthermore,the length of plateau period of stress-strain curve is obviously shortened and the area surrounded by the curve is also significantly reduced.The dynamic peak stress,peak strain and impact toughness of PVA/ECC decrease significantly with the increase of length-diameter ratio,which reveals the existence of a certain size effect,and that the higher the strain rate or the smaller PVA fiber contents by volume is the more obvious the influence of length-diameter ratio will be.The strain rate effect of PVA/ECC specimens with larger length-diameter ratio may become not obvious,but the strengthening effect of PVA fiber become more obvious,which effect is the most significant on impact toughness.

关 键 词：高延性纤维增强水泥基复合材料 聚乙烯醇 分离式霍普金森压杆(SHPB) 长径比 动态压缩性能 

分 类 号：TB33[一般工业技术—材料科学与工程] TU528.58[建筑科学—建筑技术科学]