State the Problem  
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The strain rosette shown was used to obtain the following normal strain data at a point on the free surface of an aluminum (E = 70 GPa; ν = 0.33) plate.

εa = +770με   εb = +1,180με   εb = -350με

Determine:

  • the stress components σx, σy, and τxy at the point
  • the principal stresses at the point
  • the orientation of the principal stresses
Principal stresses from rosette data