Question

An aircraft component is fabricated from an aluminum alloy that has a plane strain fracture toughness of 40 . For an applied stress of 300 MPa, what size of sharp crack will propagate until fracture and failure? Assume the crack is located on the edge of a large specimen, use a geometry factor of 1.1

A. 4.6 mm
B. 2.3 mm
C. 2120 mm
D. 5.8 mm

Answer 1

B. 2.3mm

Explanation:

The correct answer for the given question is B. 2.3mm. Some aircraft are made are fabricated from aluminium which has plane stain fracture toughness. In the given scenario the plane stain toughness is

Ktc = 40 [ MPa
`√((m))` ]

When the Ktc increases the fracture will appear on the aircraft. In this case the maximum crack until the fracture failure is 2.5mm.