MecMovies 4.0 : M13.5: Strain Measurement with Rosettes

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ε_a = -215 με

ε_b = -130 με

ε_c = +460 με

For this problem, three strain transformation equations are used:

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

These three equations are solved simultaneously for the three unknowns ε_x, ε_y, and γ_xy.