A 70 degree Glass/Epoxy unidirectional lamina is subjected to the following global stresses:
$\sigma_x = -98MPa$, $\sigma_y = 115MPa$ and $\tau_{xy} = 64MPa$. Find the following:
1. Global strains (EpsG) [3 x 1 array]
2. Local stresses (SigL) in MPa [3 x 1 array]
3. Local strains (EpsL) [3 x 1 array]
4. Strength Ratios (SRs) [1 x 3 array]
5. Check if the lamina fails under the applied loads using the maximum stress failure criteria. If it
fails, what is the failure mode? (MSFT: 0 if no failure, 1 if 1T, 2 if 1C, 3 if 2T, 4 if 2C and 5 if S)
6. Check if the lamina fails under the applied loads using the maximum strain failure criteria. If it
fails, what is the failure mode? (MStrainFT: 0 if no failure, 1 if 1T, 2 if 1C, 3 if 2T, 4 if 2C and 5 if
S)
7. Check if the lamina fails under the applied loads using the Tsai-Hill failure criteria (Call the
parameter TsaiHill)
8. Check if the lamina fails under the applied loads using the Tsai-Wu failure criteria (Call the
parameter TsaiWu and use Mises-Hencky expression for H12)
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