【摘 要】
：
Split Hopkinson pressure bar (SHPB) technique is used to determine the dynamic strength of reactive powder concretes (RPCs) with different steel-fiber contents.
【机 构】
：
Institute of Engineering Mechanics
【基金项目】
：
教育部资助项目;国家自然科学基金
论文部分内容阅读
Split Hopkinson pressure bar (SHPB) technique is used to determine the dynamic strength of reactive powder concretes (RPCs) with different steel-fiber contents.Two types of pulse shapers with different thicknesses are considered to reduce the high-frequency-oscillation effect and achieve a nearly constant strain rate over a certain deformation range.It is known that the compressive strength of concrete-like materials is hydrostatic-stress-dependent,and the apparent dynamic strength enhancement comes from both the effects of the hydrostatic stress and strain rate.In order to differentiate them,numerical method is used to calculate the contribution of the hydrostatic stress,and then the genuine strain-rate effect on dynamic compressive strength of RPCs is determined.In addition,the effect of steel-fibers on dynamic strength and failure mode of RPCs is discussed.
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