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A theory for creep crack growth
Scripta Metallurgica, 1976The paper derives an analytical expression for creep crack growth rate based on a model in which the higher and concentrated stresses ahead of the crack tip enhance creep deformation, thus progressively causing stress rupture and continuous crack advance.
Sampath Purushothaman, John K. Tien
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Creep Crack Growth: From Discrete to Continuum Damage Modeling
2001Creep crack growth in specimens and structural components has intensively been studied by many authors in the past decades. Depending on the scale adopted for the formulation of the problem, the related approach can be quite different. At the scale of individual cavities and those of the grain and grain boundaries, there is the micromechanical approach
Nguyen, B.N. +2 more
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1989
On the background of the historical evolution of the subject area, the current knowledge on creep crack growth is reviewed. The discussion is grouped around the C* integral, which is the appropriate load parameter for describing creep crack growth in ductile materials.
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On the background of the historical evolution of the subject area, the current knowledge on creep crack growth is reviewed. The discussion is grouped around the C* integral, which is the appropriate load parameter for describing creep crack growth in ductile materials.
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1983
Creep has been a subject of considerable practical and theoretical interest. In recent years, however, there has been a shift in the way creep has been viewed. In earlier times creep was looked at as a plastic deformation process with the emphasis on studying plastic flow as a function of time, temperature, stress, etc.
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Creep has been a subject of considerable practical and theoretical interest. In recent years, however, there has been a shift in the way creep has been viewed. In earlier times creep was looked at as a plastic deformation process with the emphasis on studying plastic flow as a function of time, temperature, stress, etc.
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Mechanism of Thermally Assisted Creep Crack Growth
MRS Proceedings, 1995AbstractWe use atomistic Monte-Carlo simulations to investigate the dynamics of cracks which sizes are smaller than the Griffith length. We demonstrate that such cracks can irreversibly grow proviso their size is larger than a certain critical length which is smaller than the Griffith length, as recently suggested [ L. Golubović and A.
Leonardo Golubović, Dorel Moldovan
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Creep Crack Growth Behavior in Creep-Ductile and Creep-Brittle Materials
Fatigue & Fracture of Engineering Materials & Structures, 2001Crack growth histories for creep‐brittle aluminium alloy 2519‐T87 are simulated by controlling the rate of release of finite element nodes along the crack growth path using a variable time‐step, nodal release algorithm. While earlier experimental studies established little or no correlation between time‐dependent fracture parameters and the crack ...
null Hall, null McDowell, null Saxena
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Crack Growth in Creeping Solids
1983The creep crack growth behavior in a creep-ductile material, 6061 aluminum, and a creep brittle material, Ti-6242, has been investigated. In the creep ductile material an observed load dependency in the relation between the load-point displacement rate, ˙Δ, and the crack growth rate, ˙a, precluded the straightforward application of the C* approach.
VM Radhakrishnan, AJ McEvily
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1994
In this chapter the main factors influencing high temperature creep—fatigue crack growth in engineering materials are discussed. The significance of minimum to maximum load ratio R, frequency, environment and temperature are considered in turn. Transgranular cycle dependent and intergranular time dependent controlled cracking processes are identified ...
G. A. Webster, R. A. Ainsworth
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In this chapter the main factors influencing high temperature creep—fatigue crack growth in engineering materials are discussed. The significance of minimum to maximum load ratio R, frequency, environment and temperature are considered in turn. Transgranular cycle dependent and intergranular time dependent controlled cracking processes are identified ...
G. A. Webster, R. A. Ainsworth
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The initiation of creep crack growth
International Journal of Solids and Structures, 1982Abstract The blunting of a crack tip under creep conditions is investigated using an approximate analysis which assumes that the crack blunts into a semi-circular shape. The rate of crack opening displacement is determined as a function of applied load and the material creep strain rate law.
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Global and Local Approaches to Creep Crack Initiation and Creep Crack Growth
1991Creep crack initiation and creep crack growth behaviours were studied in two creep ductile materials, an austenitic stainless steel and a low alloy ferritic steel. A number of limitations of the global approach to creep cracking, in which unique correlations between time to initiation or creep crack growth rate and the load-geometry parameter, C*, are ...
R. Piques, A. Pineau
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