摘要
采用Φ75 mm大口径分离式霍普金森压杆装置对钢纤维体积率分别为0%、0.75%、1.50%的混凝土试件进行动态性能实验,得到了不同钢纤维含量及不同应变率下材料的应力-应变全曲线。实验结果表明,钢纤维的加入增强了混凝土的韧性,并且随着纤维含量及应变率的增加,钢纤维混凝土材料的峰值应变和峰值应力都随之提高。以此实验为基础提出了一种基于含围压和应变率效应的动态本构模型,并对实验曲线进行了拟合,取得了良好的拟合效果。结果表明所提本构模型是合理的,具有良好的应用价值。
Φ75 mm large diameter split Hopkinson pressure bar( SHPB) system is used to test the dynamic performances of concrete samples with steel fiber volume rates of 0%,0. 75% and 1. 5%. The stress-strain curves of reinforced concretes with different steel fiber contents and different strain rates are obtained. The experimental results show that the peak strain and the peak stress of steel fiber reinforced concrete are improved with the increase in fiber content and strain rate. Based on the analysis of the experimental results,a dynamic constitutive model is proposed,which is based on the confining pressure and strain rate effects. Comparison between the theoretical curve and test date shows that the proposed constitutive model is reasonable and has good application value.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2017年第S1期66-72,共7页
Acta Armamentarii
基金
国家自然科学基金项目(11402266
11672138
11472008)
瞬态物理国家重点实验室基金项目(61426040403162604005)
中央高校基本科研业务费专项资金项目(30916011348)
关键词
固体力学
钢纤维混凝土
分离式霍普金森压杆
应变率效应
动态本构关系
solid mechanics
steel fiber reinforced concrete
split Hopkinson pressure bar
strain rate effect
dynamic constitutive relation
