MecMovies 4.0 : M13.5: Strain Measurement with Rosettes

scene 4 of 11

Strain measurement with rosettes

Next, consider the transformation equation for gage c to find ε_y:

ε_{c} = ε_{x} \cos^{2} θ_{c} + ε_{y} \sin^{2} θ_{c} + γ_{xy} {sinθ}_{c} {cosθ}_{c}

Gage c is aligned with the y-axis, making $θ_{c} = 90 °$ . Therefore:

{cosθ}_{c} = 0

and

{sinθ}_{c} = 1

The strain transformation equation reduces to:

ε_{c} = ε_{y}

∴ ε_{y} = + 460 με