Numerical Behaviour of Al 6063 Under Varying Striker Velocity and Length of Split Hopkinson Pressure Bar at Large Strain Rates

Abstract

The high strain rate characterization of materials has always remained essential to know the exact behaviour in dynamic conditions, such as blasts, earthquakes, projectile penetrations, crashworthiness of vehicles and bulletproof armours. These high strain characterizations can be done using experimental technique such as Split Hopkinson Pressure Bar (SHPB) Test. These experimental techniques are very costly and difficult to conduct. However, the behaviour of materials under dynamic loading can be performed under high strain rate using finite element simulation of SHPB test. The numerical simulations of Al 6063 under different conditions under large strain rate range are performed utilizing ABAQUS/Explicit 6.14. To understand the effect of length, striker bar’s length is varying from 200 to 400 mm, while its diameter is kept constant as 20 mm. Furthermore, impact velocity is also varied from 20 to 40 m/s to see the effect of velocity under large strain rates. The test specimen’s dimensions are also of varying diameter to understand the aspect ratio effect under dynamic conditions. Results stated that the wave’s amplitude and duration are dependent on the striker parameters. Striker length also affects the flow behaviour of specimen.KeywordsFinite element analysisDynamic behaviourSplit Hopkinson Pressure BarAl 6063Aspect ratioStriker dimensions