三峡大学学报（自然科学版）2018，Vol.40Issue(3)：56-60,5.DOI:10.13393/j.cnki.issn.1672-948X.2018.03.012
混凝土冲击拉伸力学性能及裂纹扩展试验研究和数值模拟
Experimental Study and Numerical Simulation of Split Tensile Properties and Crack Propagation of Concrete
摘要
Abstract
For the real split tensile properties of concrete,the splitting tensile test of the Brazilian disc speci-men is carried out by using the split Hopkinson pressure bar(SHPB)based on the strain gauge method.The effects of different loading angles on the failure mode are studied and the finite element simulation of the fail-ure process of the specimen is carried out.The effect of loading angle on the crack propagation and the failure mechanism of concrete are studied.What's more,the split tensile stress-radial strain curve is got;and the strain rate effect of the tensile strength,ultimate strain and tensile sensitivity coefficient are analyzed.The re-sults show that the loading angle of 20°can ensure the specimens crack at the center;and it is the most relia-ble to test the splitting tensile properties of concrete.Under the high strain rate,the dynamic parameters of concrete have obvious strain rate effect;the crack propagates along the loading direction;and the specimen is split into two parts with a certain width of shear zone;and the failure surface shows an aggregate destruction. The numerical simulation results are consistent with the experimental results.关键词
霍普金森压杆/加载中心角/平台巴西圆盘/裂纹扩展/力学性能/扩展有限元Key words
split Hopkinson pressure bar/loading angle/flattened Brazilian disc/crack propagation/mechanical properties/extended finite element method分类
建筑与水利引用本文复制引用
戚亚珍,张华,郭继鑫..混凝土冲击拉伸力学性能及裂纹扩展试验研究和数值模拟[J].三峡大学学报（自然科学版）,2018,40(3):56-60,5.基金项目
国家自然科学基金青年基金(51609071) （51609071）
江苏省自然科学基金青年基金(BK20140848) （BK20140848）
