Metal Fatigue: Effects of Small Defects and Nonmetallic Inclusions Yukitaka Murakami Elsevier [...]... 6.2 Similarity of Effects of Nonmetallic Inclusions and Small Defects and a Unifying Interpretation 6.3 Quantitative Evaluation of Effects of Nonmetallic Inclusions: Strength Prediction Equations and their Application 6.4 Causes of Fatigue Strength Scatter for High Strength Steels and Scatter Band Prediction 6.5 Effect of Mean Stress 6.5.1 Quantitative Evaluation of the Mean Stress... Effects of NonmetallicInclusions on Fatigue Strength Review of Existing Studies and Current Problems 6.1.1 Correlation of Material Cleanliness and Inclusion Rating with Fatigue Strength 6.1.2 Size and Location of Inclusions and Fatigue Strength 6.1.3 Mechanical Properties of Microstructure and Fatigue Strength 6.1.4 Influence of Nonmetallic Inclusions Related to the Direction and Mode of Loading... tip are quite different from those at holes and notches An understanding of the basic features of stress concentration is needed to understand the main topic of this book, which develops a new idea for the quantitative evaluation of the effect on fatigue strength of small defects, small cracks, and nonmetallic inclusions 2.1 Stress Concentrations at Holes and Notches Fig 2.1 shows a circular hole in... 347 349 Appendix B Database of Statistics of Extreme Values of Inclusion Size fim Appendix C Probability Sheets of Statistics of Extremes 351 357 Index 359 1 Chapter 1 Mechanism of Fatigue in the Absence of Defects and Inclusions In order to evaluate quantitatively the effects of defects and inclusions we must first understand the basic mechanism of fatigue Researchers who are... Fatigue of Materials Containing Small Defects 6.5.2 Effects of Both Nonmetallic Inclusions and Mean Stress in Hard Steels 6.5.3 Prediction of the Lower Bound of Scatter and its Application 6.6 Estimation of Maximum Inclusion Size ~ , , , by Microscopic Examination of a Microstructure 6.6.1 Measurement of fi,,,,,,Inclusions by Optical for Largest Microscopy 6.6.2 True and Apparent... between A Kth and the Geometrical Parameter &GZ Material Parameter HV which Controls Fatigue Limits Application of the Prediction Equations Limits of Applicability of the Prediction Equations: Eqs 5.4 and 5.5 The Importance of the Finding that Specimens with an Identical Value of &GZ for Small Holes or Small Cracks Have Identical Fatigue Limits: When the Values of 1 for a Small Hole and a Small Crack... 884-891 29 Y Murakami, Y Tazunoki and T Endo: Existence of Coaxing Effect and Effect of Small Artificial Holes of 40-200 vm Diameter on Fatigue Strength in 2017S-T4 A1 Alloy and 7 :3 Brass, Trans Jpn SOC Mech Eng A, 47(424) (1981) 1293-1300; ibid, Metall Trans A, 15 (1984) 2029-2038 30 H Nisitani and A Yamaguchi: Coaxing Effect of Specimens with a Hole and Behavior of Their Cracks, Trans Jpn SOC Mech... 2017-T4aluminum alloy and investigation of coaxing effect Therefore, the mechanism of the fatigue limit for notched specimens may be used in the understanding of the fatigue limit behaviour of unnotched specimens of nonferrous metals 1.2 Relationship between Static Strength and Fatigue Strength The relationships between fatigue strength and yield stress, cy, ultimate tensile strength, au ,and hardness, HB... T Mura and M Kobayashi: Change of Dislocation Structures and Macroscopic Conditions from Initial State to Fatigue Crack Nucleation, ASTM STP 924, 1 (1998) 39-63 20 J.A Ewing and J.W.C Humfrey: The Fracture of Metals under Repeated Alternations of Stress, Philos 200 (1903), 241-253 Trans R SOC., 21 H.J Gough, Fatigue of Metals, Scott Greenwood, London, 1924 22 T Isibasi: Prevention of Fatigue and Fracture... 8.2.1 Materials and Experimental Procedure 8.2.2 interaction of Factors Influencing Fatigue Strength 8.2.2.1 Effect of Shot Peening 8.2.2.2 Effects of Nonmetallic Inclusions and Corrosion Pits 8.2.2.3 Prediction of Scatter in Fatigue Strength using the Statistics of Extreme References 9 Tool Steels: Effect of Carbides 9.1 9.2 9.3 9.4 Low Temperature Forging and Microstructure . Similarity of Effects of Nonmetallic Inclusions and Small Defects and a Unifying Interpretation Quantitative Evaluation of Effects of Nonmetallic Inclusions:. way of understanding through the phenomena of metal fatigue the effect of small defects. The other is to set out a practical method for engineers and