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Consider a linear elastic rectangular thin sheet of metal, subjected to uniform uniaxial tensile stress of $100$ MPa along the length direction. Assume plane stress conditions in the plane normal to the thickness. The Young’s modulus $E=200$ MPa and Poisson’s ratio $v=0.3$ are given. The principal strains in the plane of the sheet are

1. $(0.35, – 0.15)$
2. $(0.5, 0.0)$
3. $(0.5, – 0.15)$
4. $(0.5, – 0.5)$
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