A beam with a rectangular cross section has dimensions of b =40 mm and t= 20 mm. The beam is made of 7475-T7351 aluminium and is subjected to a bending moment of M = 900 N*m
What is the critical crack length for fracture?
What crack length can be allowed if a safety factor of 3.0 against brittle fracture is required?
For crack length above what is the safety factor against fully plastic yielding?