钢纤维活性粉末混凝土的动态力学性能  

Dynamic mechanical behavior of steel-fiber reactive powder concrete

作　　者：任兴涛[1,2] 周听清[1] 钟方平[2] 胡永乐[2] 王万鹏[2] 

机构地区：[1]中国科学技术大学近代力学系,安徽合肥230026 [2]西北核技术研究所,陕西西安710024

出　　处：《爆炸与冲击》2011年第5期540-547,共8页Explosion and Shock Waves

摘　　要：利用φ74mm SHPB实验装置对钢纤维活性粉末混凝土(RPC)进行动态压缩实验和动态劈裂拉伸实验。获得了钢纤维RPC在1～102 s-1应变率加载下的动态力学参数。对试件内的动态应力分布进行数值模拟,验证了动态实验的有效性。结果表明,钢纤维RPC的动态压缩和动态劈裂拉伸的力学性能均表现出显著的应变率效应。随着应变率的增加,钢纤维RPC冲击压缩破坏应力、冲击压缩破坏应变、弹性模量、动态劈裂拉伸破坏应力均有一定程度的增加,动态拉压比相对静态拉压比也有显著的提高。Dynamic compressive and tensile experiments were conducted for the steel-fiber reinforced reactive powder concrete（RPC） by using a 74-mm-diameter SHPB setup.The dynamic mechanical parameters were obtained for the steel-fiber reinforced RPC at the different strain rates of 1~10 2 s-1.The dynamic stress distribution in the specimen was numerically simulated to validate the dynamic tensile experiments.Investigated results reveal that both the dynamic compressive and tensile mechanical properties take on obvious strain-rate effects.With the increase of strain rate,the following parameters all increase to a certain extent,which include the dynamic compressive strength,strain and elastic modulus;and the dynamic splitting tensile strength.And the ratio of dynamic tensile to compressive strength has an observable increase compared with the ratio of static tensile to compressive strength.

关 键 词：固体力学 应变率效应 SHPB 活性粉末混凝土 动态压缩 动态劈裂 

分 类 号：O347[理学—固体力学] TU435[理学—力学]