高应变率下混凝土动态力学性能SHPB实验

Dynamic mechanical behavior of concrete under high strain rate using SHPB

利用φ100 mm霍普金森压杆试验设备,研究了混凝土材料在冲击荷载下的动态压缩性能,分析验证了实验结果的有效性、一致性和试样中的应力均匀性问题,得到了混凝土材料在较高应变率范围内的动态应力—应变关系。研究表明,混凝土材料的动态应力—应变呈非线性关系;混凝土材料为应变率敏感性材料,在较高应变率范围内混凝土材料的动态应力—应变关系是与应变率相关的;混凝土材料的破坏应力和破坏应变随应变率的增大而增大。

The Split Hopkinson Pressure Bar （SHPB） of Ф100 mm was used to investigate the dynamic mechanical behavior of the concrete under impact loading. The validity, consistency and uniformity of the stress in the specimen had been verified, and the dynamic stress-strain relationship of the concrete was presented within the scope of high strain rate. The results show that the dynamic stress-strain relationship of the concrete is nonlinear, that within the scope of high strain rate, the dynamic stress-strain relationship of the concrete is strain rate-dependent, which means that the concrete is strain rate sensitive, and that the failure stress, failure strain and the initial modulus of elasticity increase with the strain rater s increasing.