Aluminium and aluminium alloy
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Work-hardening characteristics<br />
During tensile testing, the <strong>alloy</strong> exhibits work hardening<br />
after yielding.<br />
Work hardening curves of annealed, recrystallised <strong>aluminium</strong><br />
<strong>alloy</strong>s can be expressed as follows<br />
n<br />
Where σ : true stress<br />
σ = kε<br />
σ = k ( ε 0<br />
+ ε )<br />
n<br />
…Eq. 11<br />
…Eq. 12<br />
ε : true strain<br />
n : work hardening exponent<br />
Work hardening curves of cold-work tempers (non-heattreatable<br />
<strong>alloy</strong> after cold working to the initial strain ε o ) can be<br />
expressed as follows<br />
Where ε ο : true strain<br />
n : work hardening exponent<br />
Note: work-hardening of <strong>aluminium</strong> <strong>alloy</strong>s decreases with<br />
increasing temperature.<br />
Suranaree University of Technology Tapany Udomphol<br />
May-Aug 2007
Change language