Effects of strain rate on mechanical properties in tension of a commercial aluminium alloy used in armour applications

Cadoni, Ezio and Dotta, Matteo and Forni, Daniele and Kaufmann, Hanspeter (2016) Effects of strain rate on mechanical properties in tension of a commercial aluminium alloy used in armour applications. Procedia Structural Integrity, 2. pp. 986-993. ISSN 2452-3216

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Abstract

The use of aluminium alloys in the construction of defense vehicles is strongly increasing in these last decades because they require new lightweight armours for improving their survivability without sacrificing efficiency and performance. In this paper the effects of strain rate on the mechanical properties in tension of a commercial aluminium alloy AA7081 is analyzed. The tests have been carried out by means of three different set-ups for quasi-statics, medium and high strain rates. For the high and medium strain rate tests have been used respectively a Split Hopkinson Tension Bar device and a Hydro-pneumatic machine installed in the DynaMat Laboratory of the University of Applied Sciences of Southern Switzerland-Lugano. The results show: an increase of the stress at a given strain when increasing the strain-rate from 10-3 to 103 s-1, a strain-rate sensitivity of the uniform and fracture strain, a moderate reduction of the cross-sectional area at fracture with increasing the strain-rate. Based on these experimental results the parameters required by the Johnson-Cook constitutive law have been determined.

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