Strain rate effects on mechanical properties in tension of aluminium alloys used in armour applications

Abstract

Abstract. The mechanical properties in tension of two aluminium alloys (AA5059-H131 and AA7039-T651) used in armour applications were determined from tests carried out over a wide range of strain-rates on round specimens. The experimental research was developed in the DynaMat laboratory of the University of Applied Sciences of Southern Switzerland. The target strain rates were set at the following four levels: 10 −3 , 30, 300 and 1000 s −1 . The quasi-static tests were performed with a universal electromechanical machine, whereas a hydro-pneumatic machine and a Split Hopkinson Tensile Bar apparatus were used for medium and high strain-rates respectively. The required parameters by the Johnson-Cook constitutive law were also determined.

Thermoelastic Response of Metals at Different Loading Rates

“…When the strain rate changes significantly, the mechanical properties of the material change accordingly [Rund 2015], [Cadoni 2016], [Dzugan 2017]. Materials are sensitive to strain rate and work hardening can be their response to changes in strain rate.…”