基于SHPB装置的膨胀圆柱管实验技术

Anexperimentaltechniqueforexpandingofmetalcylinder basedonSHPB

1.
NationalKeyLaboratoryofShock WaveandDetonationPhysics,InstituteofFluidPhysics,

摘要: 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102~104s-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。
- 固体力学 /
- 膨胀断裂 /
- SHPB /
- 金属圆柱管
Abstract: The45steelcylindershellswereloadedbytheimprovedSHPBtoundergoexpandingfracture. Theexperimentalcylindershellssubjectedtodifferentdegreesofexpandingdeformationranging fromzerotofracturestrainwererecoveredwithoutsecondloading.Andtheradialstrain,strainrate andcircumferentialtensionstressofthecylindershellsatthefracturepositionwereobtainedbynumericalsimulationandexperiments. Thefracturetime,fracturestrain,fracturestrainrateandfracturestressofthecylindershellsatthefracturepositioncanbeaccuratelydeterminedbythestrainsignalsattheen softhecylindershells.Theimprovedexperimentaltechniquecanbeusedtoobserve theexpandingfractureofthemetalcylindershellsinthestrainraterangefrom102to104s-1.
- solidmechanics /
- expandingfracture /
- SHPB /
- metalcylinder