# Finding the elastic modulus of a metal in a mixed phase

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1. Apr 19, 2017

### joemmonster

1. The problem statement, all variables and given/known data
If a metal is adhered to a surface of another metal, let's say copper is plated onto aluminum, how can the elastic modulus of copper can be extracted given only the data of the thickness of the copper and aluminum, the young's modulus of the combined metal and the modulus of the copper.

2. Relevant equations
Young's modulus equation is the only thing i can think of which is E = Stress/Strain

3. The attempt at a solution
Tried to plug in the values by breaking down the stress into F/A = (F/L*W) in which W is the thickness of copper and aluminum but the moduli left untouched.

2. Apr 24, 2017

### PF_Help_Bot

Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.

3. Apr 24, 2017

### Dr.D

Looking at your example, copper plated onto aluminum, I think you are hoping for too much. A plated film is not going to have significant influence on the mechanical properties of an aluminum bar.

Now if the plated film and the aluminum base are of comparable thickness, you might envision a tensile test that would give some information. Presumably, the two films would both suffer identical strain in the tensile test, so you could treat this the same way that rebar in a concrete beam is treated. It will be a bit awkward since the thing you want to discover is the Young's modulus for the copper, but it should be possible.