Buckling and longitudinal cracks in electromagnetically accelerated hollow cylinders

被引：0
|
作者：
Madhavan, S. [1 ]
Mehra, V. [1 ]
Pahari, S. [1 ]
Ghosh, S. [2 ]
Sijoy, C. D. [1 ]
Chaturvedi, S. [1 ]
机构：
[1] Bhabha Atom Res Ctr, Computat Anal Div, Visakhapatnam, Andhra Pradesh, India
[2] Univ Hyderabad, Sch Engn Sci & Technol, Hyderabad 500134, Andhra Pradesh, India
来源：
INTERNATIONAL JOURNAL OF FRACTURE | 2015年 / 193卷 / 01期
关键词：
Projectile fracture; Plastic strain; MHD; Electromagnetic compression; Adiabatic shear band; Buckling; FRACTURE; STRAIN; COILGUN; IMPACT;
D O I：
10.1007/s10704-015-0010-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Hollow cylindrical Al-6061 T6 projectiles, driven in a coilgun system, suffer radial compression and buckle into quadrilateral or pentagonal cross sections. In some cases, the projectiles fail by developing longitudinal cracks in the compressed region. Simulations of the coilgun-projectile system, using Johnson-Cook and Bao-Wierzbicki failure models, reproduce buckling and formation of longitudinal cracks via localization of plastic strain and high temperatures around the bends of the buckled geometry. Failed specimens were micro-graphically investigated and the cause of failure attributed to synergistic effect of buckled geometry and localized high temperature zones.
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页码：1 / 16
页数：16
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