The double lap joint carries a load P = 16 kN. The bolt hole has a diameter of 20 mm. The center member is 50 mm in width and 2 mm in thickness. The outer straps are 40 mm wide. (a) If a symmetrical...

The double lap joint carries a load
P
= 16 kN. The bolt hole has a diameter of 20 mm. The center member is 50 mm in width and 2 mm in thickness. The outer straps are 40 mm wide. (a) If a symmetrical crack forms at the bolt hole in the center member, whose fracture toughness is 33 MPa-m^1/2, will the crack growth arrests before failure occurs? (b) If the answer to part (a) is yes, will the arrested crack be visible?