A cast iron plate in biaxial tension is subjected to a tensile stress σxx = 31 MPa and σyy = 17 MPa (see Figure 1). The corresponding strains in the plate are εxx = 240 · 10−6 and εyy = 85 · 10−6. (a) Determine the Poisson's ratio ν and the modulus of elasticity E of the material.

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