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.
Mohr's strain circle
γ = -lateral strain / axial strain
σx = E / 1 - γ2 (εx + γεy)
σy = E / 1 - γ2 (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!