Question

11 Flaws are detrimental to fracture strength because an applied stress may be amplified or concentrated at the tip of a flaw. (5 (5 Points) True False 12 Fracture toughness, in the presence of a crack, is related to the critical stress for crack propagation. (5 Points) True False

Answer 1

True. Crack reduces the cross-section which causes screase in stress. So, we can cracks concentrate say Stress flaws are be crack orientation and defatimental to the fractwee strength because an applied Stress may amplified cencentaaled at the tip, the magnitude of this amplification depends geometry. Fractune toughness is the corticale is the critical stress porte factor of a shaap crack where propagation of Beddenly beiemes gapid. Tome. measures materials resistance to brittle fracture when a crack is present. It is a fundamental property of the materiale fortensity KIC Torce. Strain energy released as the crack propagates It is given by Griffiths energy jelease rate