An investigation on Bauschinger effect of yielding behaviour of aluminium alloy 7XXX using instrumented indentation

In the current research, an attempt was made to use the capability of instrumented sharp indentation experiment in a multi-cycle loading on Zinc containing aluminium alloy (7XXX). The Bauschinger effect on yielding behaviour of samples was investigated by indentation using Vickers indenter. Subsequently, a comparison step was performed utilizing the uniaxial tension test. Assuming constant values for work hardening exponent, stress-strain and load-displacement curves resulted from tension and indentation were plotted respectively and yield stress was derived. Comparing the yield stresses of tension and indentation tests indicates that, instrumented indentation technique can be considered as a reliable substituent for conventional tension method. In order to verify the experimental results obtained from both tests, finite element approach was conducted for process simulation, and curves show acceptable agreement between experimental and predicted results.

کلیدواژه ها:

Bauschinger effect ، Indentation ، Finite element method ، Work hardening