Results 161 to 170 of about 1,100 (217)
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Living with creep damage… outside the creep range
Energy Materials, 2007Abstract The present paper addresses the effects of creep cavitation damage on other mechanical properties – chiefly those that affect behaviour outside the creep range. Such effects seem not to have been systematically studied, yet they are significant for the understanding and prediction of component integrity and life.
J. M. Brear, P. Jarvis
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2016
Creep is an important factor in designing metal structures used at elevated temperatures. Dislocations again play a key role in deformation at elevated temperatures; they multiply, slip, form voids and subgrain boundaries, and annihilate. This chapter shows that the shear wave attenuation is highly sensitive to the dislocation activity in crept metals ...
Masahiko Hirao, Hirotsugu Ogi
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Creep is an important factor in designing metal structures used at elevated temperatures. Dislocations again play a key role in deformation at elevated temperatures; they multiply, slip, form voids and subgrain boundaries, and annihilate. This chapter shows that the shear wave attenuation is highly sensitive to the dislocation activity in crept metals ...
Masahiko Hirao, Hirotsugu Ogi
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Creep Damage and Creep Rupture of Metals
1990The aim of this note is to present the theoretical model of a creep damage and creep rupture of metals. Constitutive equations describing these phenomena were formulated assuming that the tertiary creep is a result of stiffness and strength reduction of a material due to crack and void growth. A current state of the deteriorated material microstructure
Andrzej Litewka, Zdzisław Lis
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1982
The creep data obtained during C0ST50, round II, have been reanalyzed according to the recovery creep model modified for precipitation strengthening mechanisms. A good description of creep data is obtained in this way for all cases studied. A dislocation climb bypassing mechanism is indicated as beeing the governing process in service applications of ...
Y. Lindblom, G. Engberg
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The creep data obtained during C0ST50, round II, have been reanalyzed according to the recovery creep model modified for precipitation strengthening mechanisms. A good description of creep data is obtained in this way for all cases studied. A dislocation climb bypassing mechanism is indicated as beeing the governing process in service applications of ...
Y. Lindblom, G. Engberg
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1965
The use of alloys under conditions where creep occurs results in continuous accumulation of “damage” to the mechanical properties. Design must therefore consider what amount of creep can be tolerated during the required service life. In some cases the allowable creep is considerably less than one percent plastic strain.
J. W. Freeman, H. R. Voorhees
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The use of alloys under conditions where creep occurs results in continuous accumulation of “damage” to the mechanical properties. Design must therefore consider what amount of creep can be tolerated during the required service life. In some cases the allowable creep is considerably less than one percent plastic strain.
J. W. Freeman, H. R. Voorhees
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Engineering Fracture Mechanics, 1979
Abstract The effect of two step stress variation and intermittent loading on the creep behaviour of commercially pure aluminium and stainless steel has been investigated. In the two step stress variation, the first stress σ1 was applied for a given time t1 and the stress level was switched over to σ2.
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Abstract The effect of two step stress variation and intermittent loading on the creep behaviour of commercially pure aluminium and stainless steel has been investigated. In the two step stress variation, the first stress σ1 was applied for a given time t1 and the stress level was switched over to σ2.
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Mechanism Based Unified Creep Model Incorporating Damage
Volume 6: Materials and Fabrication, Parts A and B, 2008Although it is often said that diffusional flow creep is out of the practical engineering applications, the need for a unified model capable to account for the resulting action of both diffusional and dislocation type creep is justified by the increasing demands of reliable creep design for very long lives (exceeding 100.000h), high stress-low ...
Bonora N, ESPOSITO, Luca
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Creep Damage and Creep-Fatigue Damage
2011A time-dependent deformation occurring in a material subject to load for a prolonged period of time is called creep. In a narrower sense, creep means a time-dependent deformation caused by a constant stress or a constant load. Materials undergoing creep for long time are often accompanied by time dependent internal deterioration.
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Measuring creep damage using microradiography
Metallurgical Transactions A, 1988Microradiographic techniques employing synchrotron radiation were used to investigate creep damage in several ferrous alloys. Creep damage, in the form of voids and microcracks, was imaged through differential absorption of the transmitted X-ray beam in the damaged and undamaged regions.
J. E. Benci, D. P. Pope
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A Continuum Theory of Creep and Creep Damage
1981It is shown that the material damage in creep can be represented by a second rank symmetric tensor. The constitutive equations of creep and creep damage are formulated by employing the damage tensor as an internal state-variable. The difference between the effects of the material damage on creep and damage growth is incorporated. Anisotropic damage law,
S. Murakami, N. Ohno
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