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(a) Determine the critical crack length for a center crack in a plate of aluminum alloy...

(a) Determine the critical crack length for a center crack in a plate of aluminum alloy under uniaxial tension. The critical stress intensity factor of this alloy is 25.5 M P a ⋅ m. The plate width and thickness are 250 mm and 10 mm, respectively. Along the length direction, a 1000 kN force is applied. Assume Y = π. The Young’s modulus is 85 GPa. The yield strength is 105 MPa. (b) What is the critical crack-tip opening displacement (CTOD)? (c) What is the critical crack-tip plastic/process zone size?

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