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

E Cadoni,M Dotta,D Forni,S Bianchi,H Kaufmann

doi:10.1051/epjconf/20122605004

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 1000s −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.

Highlights

The use of aluminium alloys in the construction of defence vehicles is strongly increasing in these last decades because they require new lightweight armours for improving their survivability without sacrificing efficiency and performance
Many researchers reported the alloy composition, strainrate, microstructure and service temperature may have an effect on mechanical properties and failure mechanism of aluminium alloys [1, 2]
The objective of this work is the examination of the strain-rate effect on the mechanical properties in tension of 5059-H131 and 7039-T651 aluminium alloys

Summary

Introduction

The use of aluminium alloys in the construction of defence vehicles is strongly increasing in these last decades because they require new lightweight armours for improving their survivability without sacrificing efficiency and performance. Many researchers reported the alloy composition, strainrate, microstructure and service temperature may have an effect on mechanical properties and failure mechanism of aluminium alloys [1, 2]. Naka et al [3] measured the strainrate sensitivity (5 · 10 − 5 ÷ 50 s−1) of a 5xxx aluminium alloy at 20–250 ◦C. Perez-Bergquist et al [4] studied the behaviour of 5059 and 7039 aluminium alloys in compression and shear in both quasi-static and dynamic strain-rates regimes. The objective of this work is the examination of the strain-rate effect on the mechanical properties in tension of 5059-H131 and 7039-T651 aluminium alloys

Objectives

Results

Conclusion