Principle stress states question, anyone help?

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scw1
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Principle stress states question, anyone help??

Homework Statement


Neutron diffraction is used to measure the residual strains near to a weld in an aluminium plate. The aluminium has a young’s modulus E of 70GPa and a poisons ratio of 0.3. The three principal strains obtained are ε1= 2400 με ε2=0με ε3=-350με. What are the values of sigma 1 and sigma 2?


Homework Equations



Plane stress and strane equations

The Attempt at a Solution


Got an answer of an answer near to 212MPa and 83MPa
but not sure if its right
 

Discussion

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[strike]Your current answer looks incorrect. Try again.[/strike]
 
Last edited:


nvn said:
Your current answer looks incorrect. Try again.

Hi there the sigma2 must be 83MPa? its all i keep getting
Many thanks
Stevo
 
My apologies, scw1. Your answer was right. Nice work. However, generally always round your final answer to three significant digits, not two significant digits. You rounded slightly too much. Also, you misspelled principal and strain, and omitted all punctuation.