Question: A polystyrene component must not fail when a tensile stress of 1.25MPa (180psi) is applied. Determine the maximum allowable surface crack length if the surface

A polystyrene component must not fail when a tensile stress of 1.25MPa (180psi) is applied. Determine the maximum allowable surface crack length if the surface energy of polystyrene is 0.50 J/m² (2.86 × 10^-3 in.-lb_f/in.²). Assume a modulus of elasticity of 3.0GPa (0.435 × 10⁶psi).

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