采用改进的SHPB实验装置对45钢薄壁金属圆柱管进行了膨胀断裂加载,完成了不同变形程度(覆盖圆柱管整个变形及断裂过程)圆柱管的冻结回收实验.回收样品可用于断裂机理研究分析,通过数值模拟辅助分析和实验数据拟合得到了圆柱管凸起处的径向应变、应变率和环向拉伸应力.通过在圆柱管端粘贴应变片监测断裂信号的方式,准确判断了圆柱管凸起处发生断裂的时间,以及径向断裂应变、应变率和环向拉伸断裂应力,在102～104 s-1应变率范围内,SHPB实验装置可用于研究金属圆柱管膨胀断裂.%The 45 steel cylinder shells were loaded by the improved SHPB to undergo expanding fracture. The experimental cylinder shells subjected to different degrees of expanding deformation ranging from zero to fracture strain were recovered without second loading. And the radial strain, strain rate and circumferential tension stress of the cylinder shells at the fracture position were obtained by numerical simulation and experiments. The fracture time, fracture strain, fracture strain rate and fracture stress of the cylinder shells at the fracture position can be accurately determined by the strain signals at the ends of the cylinder shells. The improved experimental technique can be used to observe the expanding fracture of the metal cylinder shells in the strain rate range from 102 to 104 s-1.
展开▼
