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Stress strain

Stress strain

Stress strain

(OP)
This is probably really simple but I'm just not seeing it.  What error is made if you measure strain at a point ex and estimate the stress as Eex where E is young's modulus?

RE: Stress strain

None, if the measurement is unitless, (inch/inch or %).

RE: Stress strain

That's correct, as long as you are in the elastic range and the material has a straight line up to yield.

RE: Stress strain

Depends on the strain field where you put the gage--is the strain in a uniaxial strain field (say the gage section of a dogbone coupon), so that the x-direction is the only direction with non-zero stress? If so, you can use E*ex=sigma-x to estimate normal stress in the x-direction. Otherwise, it's more complicated than that.

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