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[×ÊÔ´] ½ðÊôʧЧ£ºFatigue and Corrosion in Metals

×îнðÊôʧЧÊé¼®£ºFatigue and Corrosion in Metals

Contents
1 Nature and Phenomenology of Fatigue . . . . . . . . . . . . . . . . . . . . 1
1.1 History and Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 The S-N Curve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.3 Cyclic Hardening and Softening . . . . . . . . . . . . . . . . . . . . . 28
1.3.1 Cyclic Stress¨CStrain Curve Determination . . . . . . . . 31
1.3.2 The Mechanism of Hardening and Softening . . . . . . 33
1.4 Damage Nucleation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
1.4.1 High-Cycle Fatigue . . . . . . . . . . . . . . . . . . . . . . . . 35
1.4.2 Low-Cycle Fatigue . . . . . . . . . . . . . . . . . . . . . . . . 39
1.4.3 The Meaning of Fatigue Limit . . . . . . . . . . . . . . . . 40
1.5 Mechanically Small Cracks . . . . . . . . . . . . . . . . . . . . . . . . 45
1.5.1 Non-Propagating Cracks . . . . . . . . . . . . . . . . . . . . 49
1.5.2 The Three Stages of Fatigue . . . . . . . . . . . . . . . . . 53
1.5.3 Growth of MSC . . . . . . . . . . . . . . . . . . . . . . . . . . 58
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
2 Morphological Aspects of Fatigue Crack Formation
and Growth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
2.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
2.2 Extrusions and Intrusions . . . . . . . . . . . . . . . . . . . . . . . . . . 74
2.3 Morphology of Crack Propagation . . . . . . . . . . . . . . . . . . . 78
2.3.1 Real Cases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
2.4 Origin of Fatigue Striations . . . . . . . . . . . . . . . . . . . . . . . . 90
2.4.1 Striation Observation. . . . . . . . . . . . . . . . . . . . . . . 92
2.4.2 Ductile and Brittle Striations . . . . . . . . . . . . . . . . . 97
2.4.3 Striations and Fatigue Cycles . . . . . . . . . . . . . . . . . 101
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
3 Factors That Affect S-N Fatigue Curves . . . . . . . . . . . . . . . . . . . 109
3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109½ðÊôʧЧ£ºFatigue and Corrosion in Metals
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