内爆炸载荷作用下7A55铝合金的动态性能及断裂行为

Dynamicpropertiesandfracturebehaviorsof7A55aluminumalloy underexplosiveloading

1.
Aseriesofcylindertestswerecarriedouttodeterminethedynamicpropertiesof7A55aluminumalloysubjectedtointernalexplosiveloading.
2.
Thefracturemorphologyandmicrostructureof
3.
thedisruptivespecimenwereanalyzedusingthescanningelectronmicroscopyandtheopticalmicroscope.
4.
Theresultsshowthattheinternalexplosiveloading,which7A55aluminumalloycanbear,is

摘要: 采用圆筒爆炸实验研究了内爆炸载荷作用下7A55铝合金的动态性能,用扫描电镜和光学显微镜对破裂样品的断口形貌、金相组织等进行了微观分析。结果表明:在本文实验条件下,7A55铝合金能够承受 360MPa的内部爆炸加载;合金的断裂方式为剪切断裂,裂缝与筒壁的径向近似成45角;靠近圆筒内侧组织中存在剪切变形带、绝热剪切带和裂纹,沿最大剪切应力面向外扩展。
- 固体力学 /
- 动态性能 /
- 爆炸载荷 /
- 7A55铝合金 /
- 断裂行为 /
- 绝热剪切
Abstract: Aseriesofcylindertestswerecarriedouttodeterminethedynamicpropertiesof7A55aluminumalloysubjectedtointernalexplosiveloading. Thefracturemorphologyandmicrostructureof thedisruptivespecimenwereanalyzedusingthescanningelectronmicroscopyandtheopticalmicroscope. Theresultsshowthattheinternalexplosiveloading,which7A55aluminumalloycanbear,is 360MPaontheexperimentalconditions.The7A55aluminumalloycylinderunderexplosiveloading mayundergoshearfracture,andthecrackinthecylinderspecimenandtheradialdirectionofthecylinderwalllieatanangleofabout45degrees. Thedeformationband,adiabaticshearbandsandcracks canbefoundinthemicrostructureoftheinnerwall,whichspreadalongthemaximumshearstress plane.
- solidmechanics /
- explosiveloading /
- dynamicproperties /
- 7A55aluminumalloy /
- fracture behavior /
- adiabaticshear