Engineering Board Exam Reviewer · Engineering Materials · hard
A steel has a plane-strain fracture toughness of 50 MPa · sqrt(m). For a design stress of 300 MPa and Y = 1.0, what is the critical crack length (ac)?
- 53.05 mm
- 27.78 mm
- 17.68 mm
- 8.84 mm
Answer
D. 8.84 mm
Solution
ac = (1/π )(K Ic/(Y ))2 = (1/π )(50/300)2 = 0.008842 m = 8.84 mm.
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