Fatigue crack initiation and propagation in ti-6a1-4v alloy with hydrogen charging PDF Download
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Author: Keijiro Nakasa
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Keijiro Nakasa
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Book Description
Author: M. Jono
Publisher: Elsevier
ISBN: 1483294137
Category : Technology & Engineering
Languages : en
Pages : 3510
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Book Description
Significant progress in the science and technology of the mechanical behaviour of materials has been made in recent years. The greatest strides forward have occurred in the field of advanced materials with high performance, such as ceramics, composite materials, and intermetallic compounds. The Sixth International Conference on Mechanical Behaviour of Materials (ICM-6), taking place in Kyoto, Japan, 29 July - 2 August 1991 addressed these issues. In commemorating the fortieth anniversary of the Japan Society of Materials Science, organised by the Foundation for Advancement of International Science and supported by the Science Council of Japan, the information provided in these proceedings reflects the international nature of the meeting. It provides a valuable account of recent developments and problems in the field of mechanical behaviour of materials.
Author: Shinichi Nishida
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: S. Lesterlin
Publisher:
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Category : Environment
Languages : en
Pages : 23
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The fatigue crack propagation behavior of a Ti-6Al-4V alloy has been investigated at room temperature and at 300°C. Tests were run in air, high vacuum, and some other environments with controlled partial pressure of water vapor and oxygen. The enhancement of the fatigue crack growth rates observed in air in comparison to high vacuum, considered as an inert environment, is clearly attributed to the presence of water vapor. Tests in a controlled environment demonstrate that very low partial pressure can accelerate crack propagation. On the basis of previous studies on Al alloys and steels, two controlling mechanisms are considered and discussed, namely, a propagation-assisted water vapor adsorption and a hydrogen-assisted propagation.
Author: Mikhail Yurievich Korobeinik
Publisher:
ISBN:
Category :
Languages : en
Pages : 98
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Author: Sreeramesh Kalluri
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
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Author: Muhammad Shamir
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Category :
Languages : en
Pages : 0
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Author: James R. Wilcox
Publisher:
ISBN:
Category :
Languages : en
Pages : 130
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Author: CJ. Beevers
Publisher:
ISBN:
Category : Crack closure
Languages : en
Pages : 18
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Book Description
Fatigue crack growth rates and crack closure have been examined for a body-centered-cubic (bcc) titanium alloy (Ti-30Mo) at five test temperatures ranging from 123 to 340 K. In the same temperature range the influence of internal hydrogen (as provided by gas phase charging) has been studied. Detailed fractographic analyses have been made to quantify the amount of cleavage fracture as a function of test temperature, hydrogen concentration, and stress intensity factor range. The extent of cleavage, both cyclic and static, increased with decreasing temperature. For the lowhydrogen content specimens the fatigue crack growth resistance increased with increasing cleavage over the temperature range from 340 to 190 K. The fatigue crack growth resistance for the high hydrogen alloy remained relatively insensitive to the increasing amounts of cleavage over the same temperature range. An examination of the fatigue crack growth rate data shows that the power exponent in the following expression is in the range of 2 to 2.5 for temperatures of 123 to 340 K: dadn=B(?Ki-?Kthi)n where ?K = ?Ki = ?Kc and ?Ki is the intrinsic component and ?Kc is the closure component. These observations indicate that the factor dominating the fatigue crack growth rate and the resulting cyclic cleavage process is the reverse plasticity in the crack tip region. The increased resistance to fatigue crack growth in the temperature range from 340 to 190 K for the low hydrogen contents is attributed to the higher yield stresses in this region. The role of hydrogen in determining fatigue crack growth rates and fatigue thresholds (?Kth) is discussed in terms of its influence on both ?Ki and ?Kc.
