Fatigue Fracture in a High-strength Low-alloy Steel PDF Download
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Author: K. R. L. Thompson
Publisher:
ISBN:
Category :
Languages : en
Pages : 6
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Book Description
The effect of strength and stress level upon the mode and rate of fatigue crack growth in A1S14340 steel was studied by electron microfractography. It is shown that the mode of crack growth at high-strength levels is by a combination of transgranular striation formation and intergranular prior austenite grain boundary cracking, whereas in the lower-strength material only transgranular fracture occurs. The effect of stress level is found to alter slightly the proportion of the two fracture modes. At high-strength levels, measurement of striation spacing at various crack lengths indicates that the rate of crack growth is a function of the applied stress and crack length. Using this relationship it is shown that as the applied stress decreases, crack initiation becomes increasingly important in determining fatigue life. (Author).
Author: K. R. L. Thompson
Publisher:
ISBN:
Category :
Languages : en
Pages : 6
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Book Description
The effect of strength and stress level upon the mode and rate of fatigue crack growth in A1S14340 steel was studied by electron microfractography. It is shown that the mode of crack growth at high-strength levels is by a combination of transgranular striation formation and intergranular prior austenite grain boundary cracking, whereas in the lower-strength material only transgranular fracture occurs. The effect of stress level is found to alter slightly the proportion of the two fracture modes. At high-strength levels, measurement of striation spacing at various crack lengths indicates that the rate of crack growth is a function of the applied stress and crack length. Using this relationship it is shown that as the applied stress decreases, crack initiation becomes increasingly important in determining fatigue life. (Author).
Author: Ricardo Branco
Publisher: MDPI
ISBN: 3038972045
Category : Technology & Engineering
Languages : en
Pages : 220
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Book Description
This book is a printed edition of the Special Issue "Mechanical Behavior of High-Strength Low-Alloy Steels" that was published in Metals
Author: R. P. Gangloff
Publisher:
ISBN:
Category :
Languages : en
Pages : 86
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Book Description
Author: Charles W. Marschall
Publisher:
ISBN:
Category : Steel, High strength
Languages : en
Pages : 46
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Book Description
Author: Mohamed Moustafa Mohamed Zakaria
Publisher:
ISBN:
Category :
Languages : en
Pages : 278
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Book Description
Author: American Society for Testing Materials
Publisher: ASTM International
ISBN: 9780803100237
Category : Alloys
Languages : en
Pages : 208
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Book Description
Author: KA. Esaklul
Publisher:
ISBN:
Category : Closure
Languages : en
Pages : 21
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Book Description
Near-threshold fatigue crack growth in high-strength low-alloy (HSLA) steel, Fe, and Fe-Si alloys was found to depend on test temperature from room temperature down to 123 K. Near-threshold crack growth rates were lowered and threshold stress intensity factors increased with decreasing temperature. A "prominent" closure was observed for all test temperatures and materials and was further confirmed by the examination of fracture surfaces. The magnitude of closure increased with decreasing temperature, suggesting a dependence on yield strength and fracture morphology. The effects of R ratio were found to be closure-related for the same fracture processes. However, a change in the fracture process, (e.g., to cyclic cleavage) may lead to a ?Kth(eff) dependence on load ratio even at very high R values. Hence mean stress may affect threshold independently of any closure-related phenomena. A reasonable correlation was obtained with a theoretical model for closure that could account for both geometrical and reversed plasticity phenomena.
Author: Yukitaka Murakami
Publisher: Elsevier
ISBN: 0080496563
Category : Technology & Engineering
Languages : en
Pages : 384
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Book Description
Metal fatigue is an essential consideration for engineers and researchers who are looking at factors that cause metals to fail through stress, corrosion, etc. This is an English translation of a book originally published in Japan in 1993, with an additional two chapters on the fatigue failure of steels and the effect of surface roughness on fatigue strength. The methodology is based on important and reliable results and may be usefully applied to other fatigue problems not directly treated in this book.
Author: Ellis E. Fletcher
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 28
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Book Description
High-strength steels are susceptible to delayed cracking under suitable conditions. Frequently such a brittle failure occurs at a stress that is only a fraction of the nominal yield strength. Considerable controversy exists over whether such failures result from two separate and distinct phenomena or whether there is but one mechanism called by two different names. Stress-corrosion cracking is the process in which a crack propagates, at least partially, by the stress induced corrosion of a susceptible metal at the advancing tip of the stress-corrosion crack. There is considerable evidence that this cracking results from the electrtrochemical corrosion of a metal subjected to tensile stresses, either residual or externally applied. Hydrogen-stress cracking is cracking which occurs as the result of hydrogen in the metal lattice in combination with tensile stresses. Hydrogen-stress cracking cannot occur if hydrogen is prevented from entering the steel, or if hydrogen that has entered during processing or service is removed before permanent damage has occurred. It is generally agreed that corrosion plays no part in the actual fracture mechanism. This report was prepared to point out wherein the two fracture mechanisms under consideration are similar and wherein they differ. From the evidence available today, the present authors have concluded that there are two distinct mechansims of delayed failure. (Author).
Author: Raghavan Srinivasan
Publisher: Springer
ISBN: 3319482408
Category : Technology & Engineering
Languages : en
Pages : 274
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Book Description
This volume contains papers presented in the third international symposium titled Fatigue of Materials: Advances and Emergences in Understanding held during the Materials Science and Technology 2014 meeting. The book contains contributions from engineers, technologists, and scientists from academia, research laboratories, and industries. The papers are divided into six topical areas: Session 1: Aluminum Alloys Session 2: Ferrous Materials I Session 3: Ferrous Materials II Session 4: Composite Materials Session 5: Advanced Materials Session 6: Modeling The papers cover a broad spectrum of topics that represent the truly diverse nature of the subject of fatigue as it relates to the world of materials.
