钢管RPC抗多次冲击动态力学性能研究

Mechanics Performance of Reactive Powder Concrete-Filled Steel Tube Under Repeated Impact Loading

摘要: 采用&lt;i&lt;φ&lt;/i&lt;75 mm分离式霍普金森压杆试验装置对16个钢管活性粉末混凝土试件进行了不同应变率下的多次冲击压缩试验，得到了动态应力-应变曲线和破坏形态.试验结果表明：当应变率小于80 s&lt;sup&lt;-1&lt;/sup&lt;时，钢管RPC在多次冲击下仍能保持较稳定的力学性能；当应变率大于106 s&lt;sup&lt;-1&lt;/sup&lt;时，钢管RPC在多次冲击下发生塑性变形，表现出良好的延性，核心RPC开裂.多次冲击作用下，钢管RPC仍保持较高的强度、较好的延性和完整性，是一种抗冲击性能良好的防护工程材料.

Abstract: Experiments on a group of 16 reactive powder concrete-filled steel tube (RPC-filled steel tube) specimens under repeated impact loading with different strain rates were performed by using &lt;i&lt;φ&lt;/i&lt;75 mm-split Hopkinson pressure bar (SHPB) apparatus, the corresponding dynamic stress-strain curves and failure modes were obtained. The experimental results show that RPC-filled steel tube still keep excellent mechanic performances at strain rates less than 80 s&lt;sup&lt;-1&lt;/sup&lt;, but plastic deformations occur while RPC-filled steel tube at strain rates higher than 106 s&lt;sup&lt;-1&lt;/sup&lt;. Good ductility is observed and core RPC are cracked finally. It is indicated that RPC-filled steel tube is a kind of protective engineering materials with higher strength, good ductility and integrity.