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Homework Statement
A sample is put in tension and a strain rosette gives the following results:
i) Calculate principal strains and poissons ratio using Mohrs strain circle.
ii) Calculate principal stresses from principal strains and poissons ratio.
Homework Equations
Mohr's strain circle
γ = lateral strain / axial strain
σx = E / 1  γ^{2} (εx + γεy)
σy = E / 1  γ^{2} (εy + γεx)
E = 210 GPa
The Attempt at a Solution
I have drawn up Mohr's circle in autocad and found the following results.
principal strains = 122.5x10^{6} & 296.5x10^{6}
poissons ratio = 122.5 / 296.5 = 0.413 (this seems too high?)
principal stresses = σx = 11.5kPa (this is supposed to be low as the load is applied in the y direction?)
σy = 62.99MPa (should this be negative if its in tension?)
Im hoping someone can tell me if im on the right track.
Thanks in advance!
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