Results 271 to 280 of about 17,423 (316)
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Journal of Basic Engineering, 1972
A brief review is given of the literature on damage accumulation during creep and inadequacies in our present understanding are pointed out. By drawing on recent studies of the processes involved in creep-rupture, it is suggested that a new criterion for creep-damage accumulation may be proposed, which is more general than existing approaches.
M. M. Abo El Ata, I. Finnie
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A brief review is given of the literature on damage accumulation during creep and inadequacies in our present understanding are pointed out. By drawing on recent studies of the processes involved in creep-rupture, it is suggested that a new criterion for creep-damage accumulation may be proposed, which is more general than existing approaches.
M. M. Abo El Ata, I. Finnie
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Assessment of Creep Damage by NDT
MRS Proceedings, 1988AbstractResidual lifetime analysis of power plant components requires information on the degree of degradation of the material. In case of hightemperature creep, material damage can be related to cavity formation or to the accumulated creep strain. At present, only metallographic replication technique is widely used for in-service inspection to detect ...
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A coupled damage model for creep
Transactions of the Indian Institute of Metals, 2010Alloy steels of type 9Cr1Mo are being developed worldwide for the boiler and turbine components of supercritical and ultra supercritical thermal power plants and for the pressure vessel of fast breeder reactors. These steels exhibit very complex high temperature creep cavitation processes with coupled influences of creep strain, material softening and ...
M. K. Samal, B. K. Dutta, H. S. Kushwaha
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Creep cracks and the concept of damage
Journal of the Mechanics and Physics of Solids, 1968Abstract Mechanisms for creep damage and fracture are analyzed and compared with phenomenological creep rupture theories for an austenitic stainless steel. The most common form of damage in this material appears to be the formation of sharp grain boundary cracks.
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A Parametric Approach to Creep Damage
Metal Science Journal, 1969Abstract An analysis of results in the literature on density changes during creep in copper is described. The data are treated systematically in order to isolate the effect of each of the variables strain, time, stress, and temperature on the accumulation of creep damage. It is shown that all the measurements of void volume/unit weight may be described
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Creep damage in reformer tubes
International Journal of Pressure Vessels and Piping, 1983Abstract The effect of start-up and shutdown on creep damage in reformer tubes has been calculated and found to be the main cause of failure. The effect of different time/temperature profiles was investigated and the start-up and shutdown procedures found to be very relevant to the amount of creep damage done. The same calculations on tubes with half
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Creep Damage Detection of Steels
2003Structural metals are subject to aging from fatigue, creep, corrosion, irradiation, and their combination. Exposure to high temperatures promotes creeping and stress-corrosion cracking. Aged metals lose toughness, or ability to absorb energy for stresses above the yield point. They cannot withstand the occasional high loads without fracturing.
Masahiko Hirao, Hirotsugu Ogi
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Creep and Damage of Shallow Shells
International Applied Mechanics, 2018The creep and damageability of arbitrarily shaped isotropic shallow shells and plates made of materials with characteristics dependent on the type of loading are studied. The problem is stated using constitutive equations that describe the dislocation creep of initially isotropic materials with characteristics dependent on the type of loading ...
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Creep Damage and Creep-Fatigue Damage Interaction Model for Unidirectional Metal-Matrix Composites
1997A multiaxial, isothermal, continuum damage mechanics model for creep and creep-fatigue interaction of a unidirectional metal-matrix composite (MMC) volume element is presented. The model is phenomenological, stress based, and assumes a single scalar internal damage variable with directional-dependent evolution.
S Kruch, SM Arnold
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Creep-fatigue damage behavior of a titanium alloy at room temperature: Experiments and modeling
International Journal of Mechanical Sciences, 2023Yuhao Guo, Gang Liu
exaly