Solving for G and \epsilon Given E, v, and \sigma

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xrayzulu
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I am given E= 210 GPa v=0.3

[tex]\sigma[/tex]= [ -20 15 ]
15 30

How do I find G = ?

and [tex]\epsilon[/tex]

Any help much appreciated.
 

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Hi xrayzulu, welcome to PF. Please show your attempt first; that's what the template is there for.
 

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