The correct answer is Plain strain fracture toughness for aluminum alloy.
The plane strain fracture toughness is 27.5 MPa m 1 2 . KIc values obtained from specimens of different crack plane orientations were found to remain constant, indicating the lack of anisotropy in the material.Features of strength and fracture in aluminum alloys. Since many second phase particles are contained, the fracture of aluminum alloys is the ductile fracture of the dimple formation type.
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