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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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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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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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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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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 and creep damage of glass fibre reinforced polypropylene
Composite Structures, 1993Abstract Composites based on isotactic polypropylene matrix and short glass fibres were tested for creep, creep damage and creep rupture at different temperatures and stress levels. Four composites of 5–30 wt% of glass fibre content having standard fibre/matrix adhesion were used, while two materials with 20 and 30 wt% of fibres were prepared as ...
J. Hugo, M. Sova, J. Čižinský
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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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A cumulative damage theory for creep and creep-fatigue interaction
Engineering Fracture Mechanics, 1991Abstract A cumulative damage theory is developed based on the concept of bounds on residual life. Previous results applicable to fatigue are generalized to creep-rupture and to creep-fatigue interaction. By defining a creep endurance limit and void-initiation life fractions, a complete symmetry is established between the creep and fatigue cumulative ...
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Multiaxial creep-fatigue damage
Nuclear Engineering and Design, 1978Abstract This paper presents an alternative method for extending the various methods of creep-fatigue damage assessment from the uniaxial to general multiaxial regimes. Specifically, the method gives a procedure for determining a reasonable strain range in multiaxial situations where loading may not be proportional.
D.W. Lobitz, R.E. Nickel
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A theory of localization of damage in creep
Engineering Fracture Mechanics, 1986Abstract We construct a three-dimensional theory of a material in which damage may occur in creep. In the one-dimensional case the differential equations are simple enough so that they may be studied exactly, but complicated enough to exhibit a variety of interesting phenomena.
Stephen L. Passman, Timothy G. Trucano
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