Budynas-Nisbett:Shigley's ll.Failure Prevention 6.Fatigue Failure Resulting T©The McGraw-Hil 23 Mechanical Engineering from Variable Loading Companies,2008 Design,Eighth Edition 260 Mechanical Engineering Design Figure 6-2 High nominol stress Low nominal stress Mild s Schematics of fatigue fracture surfaces produced in smooth 人 and notched components with round and rectangular cross 3274717288 赶只：0 88 sections under various loading t conditions and nominal stress levels.(From ASM Handbook Vol.11:Failure Analysis and Prevention,ASM Infemational, Materials Park,OH 440730002,fg18,p.111 Reprinted by permission of ASM Intemational www.asmintemational.org.) Tension-tension or tension-compression Reversed bending Rotational bending 带 Fast-fracture zoneBudynas−Nisbett: Shigley’s Mechanical Engineering Design, Eighth Edition II. Failure Prevention 6. Fatigue Failure Resulting from Variable Loading © The McGraw−Hill 263 Companies, 2008 260 Mechanical Engineering Design Figure 6–2 Schematics of fatigue fracture surfaces produced in smooth and notched components with round and rectangular cross sections under various loading conditions and nominal stress levels. (From ASM Handbook, Vol. 11: Failure Analysis and Prevention, ASM International, Materials Park, OH 44073-0002, fig 18, p. 111. Reprinted by permission of ASM International ®, www.asminternational.org.)