高应变率下混凝土动态力学性能SHPB实验

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.

Dynamic mechanical behavior of concrete under high strain rate using SHPB

The Split Hopkinson Pressure Bar ( SHPB) of Á 100 mm was used to invest igate the dynamicmechanical behavior of the concrete under impact loading. The validity , consistency and unifo rmity of thest ress in the specimen had been v erif ied, and the dy namic st ress-st rain relat ionship of the concr ete w as presentedw ithin the scope of hig h st rain r ate. T he r esul ts show that the dynamic st ress-str ain relat ionship ofthe concr ete is nonlinear, that w ithin the scope of high st rain rate, the dynamic st ress-st rain relat ionshipof the concrete is st rain rate-dependent , which means that the concrete is str ain rate sensit ive, and that thefailure str ess, failure st rain and the init ial modulus of elast icity increase w ith the str ain rateøs increasing .