0:00 stress concentrators 3:24 stress intensity factor 5:07 Griffith theory of brittle fracture brief origin 10:20 Griffith fracture equation 11:12 Y, geometric crack size parameter 13:46 KIc fracture toughness 17:01 fracture critical flaw size example question 21:11 general characteristics of fracture in ceramics 24:50 general characteristics of polymer fracture 26:18 impact fracture testing and ductile to brittle transition 28:39 fatigue and cyclic stresses 30:13 S-N curves for fatigue failure and fatigue limit