# Homework Help: Aluminium alloy with an uts of 400MPa and is tested to a ratio of 0.1

1. Aug 13, 2010

### scw1

1. The problem statement, all variables and given/known data

Hi there if you have an aluminium alloy with an uts of 400MPa and is tested to a ratio of 0.1 and the endurance limit is 10^7 cycles is 160MPA what is the mean stress with a stress amplitude of 160MPa, how do i work out the max and min stresses and using the Goodman relation how do i calculate the endurance limit with a mean stress of zero???
SCW1

2. Relevant equations

sigmam=sigma max+sigma min/2

3. The attempt at a solution
I got 176MPa for mean stress the max stress being 320 and min stess being 32MPa and for the Goodman relation i got 159.9MPa not sure if this is right can anyone help??
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

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