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                                                                    Fatigue Failure Resulting

                                             6 from Variable Loading




                                               Chapter Outline
                                    6–1        Introduction to Fatigue in Metals  266
                                    6–2        Approach to Fatigue Failure in Analysis and Design  272
                                    6–3        Fatigue-Life Methods  273

                                    6–4        The Stress-Life Method  273
                                    6–5        The Strain-Life Method  276
                                    6–6        The Linear-Elastic Fracture Mechanics Method  278

                                    6–7        The Endurance Limit  282
                                    6–8        Fatigue Strength  283
                                    6–9        Endurance Limit Modifying Factors  286
                                   6–10        Stress Concentration and Notch Sensitivity  295
                                   6–11        Characterizing Fluctuating Stresses  300

                                   6–12        Fatigue Failure Criteria for Fluctuating Stress  303
                                   6–13        Torsional Fatigue Strength under Fluctuating Stresses  317
                                   6–14        Combinations of Loading Modes  317

                                   6–15        Varying, Fluctuating Stresses; Cumulative Fatigue Damage  321
                                   6–16        Surface Fatigue Strength  327
                                   6–17        Stochastic Analysis  330
                                   6–18        Road Maps and Important Design Equations for the Stress-Life Method  344















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