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Is it possible to find the yield stress of a material with only modulus of elasticity and Poisson's ratio?

I was given a problem that:

What is the min. aluminum needed to support a block (10 Newton) to 1 meter high? E=70GPa and v=0.3 are the only given aluminum properties.

I would know how to solve it if I knew the yield stress.

Can anyone give me some help?

(I know the yield stress for Al is usually around 270-275, but let's pretend we don't know that).

Thanks a lot!

Leo

-----------------------------------

This is what I have so far:

use Hooke's Law for strain x, y, and z.

stress x = stress z = 0; stress y is in the vertical direction.

strain x = strain z = (-v*stress_y)/E

and I'm stuck...

Thanks.

I was given a problem that:

What is the min. aluminum needed to support a block (10 Newton) to 1 meter high? E=70GPa and v=0.3 are the only given aluminum properties.

I would know how to solve it if I knew the yield stress.

Can anyone give me some help?

(I know the yield stress for Al is usually around 270-275, but let's pretend we don't know that).

Thanks a lot!

Leo

-----------------------------------

This is what I have so far:

use Hooke's Law for strain x, y, and z.

stress x = stress z = 0; stress y is in the vertical direction.

strain x = strain z = (-v*stress_y)/E

and I'm stuck...

Thanks.

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