Derivation of a Low-Cycle Fatigue Relationship Employing the J-Integral Approach to Crack Growth

Mowbray, D. F.

doi:10.1520/stp28636s

Cited by 27 publications

(7 citation statements)

References 5 publications

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“…The other parameters such as constraint C ε and crack geometry correction factor Y for aluminium-based DRMMCs were taken 0.2 and 1.12, respectively. 29,30 The values of CPZ correction factors λ l were estimated by substituting the experimental values of plastic strain ampli-…”

Section: R E S U L T Smentioning

confidence: 99%

Influence of residual thermal stresses on fatigue crack growth life of discontinuous reinforcements in metal matrix composites

Tevatia

Srivastava

2016

Fatigue Fract Eng Mat Struct

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The fatigue life prediction model based on crack propagation from micro‐structural features is derived and presented for planar and randomly oriented Discontinuous Reinforced Metal Matrix Composites (DRMMCs). The model contains the influence of micro‐structural properties such as aspect ratio, volume fraction of particle/fibre and constraint between particle and the matrix. The effect of residual thermal stresses generated within the matrix during development of composite is considered. The particle/fibre plays a dominant role in the development of the cyclic plastic zone size ahead of the crack tip; moreover, it enhances the cyclic plastic deformation characteristics of DRMMC. The theoretical model‐based evaluations for low cycle fatigue in DRMMCs are within the proximity of the experimental results.

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Section: R E S U L T Smentioning

confidence: 99%

Influence of residual thermal stresses on fatigue crack growth life of discontinuous reinforcements in metal matrix composites

Tevatia

Srivastava

2016

Fatigue Fract Eng Mat Struct

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“…Subsequently, the crack propagates into the subsurface, usually along a path perpendicular to the loading direction. This stage is of major importance since a large fraction of component life can be spent in propagating a PSC into an LC, 10,21,22 where the cyclic plastic zone size is no longer comparable to the crack depth. The lack of fully developed closure is considered by some to be the main feature of PSC growth, 3,23,24 and in these circumstances, the differences between effective stress ranges and total stress ranges become more apparent when a PSC propagates into an LC.…”

Section: Creep-fatigue Crack Growth Modelsmentioning

confidence: 99%

Creep–fatigue crack development from short crack starters

Yan

Holdsworth

Kühn

et al. 2014

Materials at High Temperatures

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A series of isothermal strain controlled creep-fatigue tests on fully instrumented cylindrical specimens with shallow chordal crack starters has been conducted for an advanced 9%Cr turbine rotor steel at 600 and 625uC. Cyclic/hold wave shapes involving a dwell period at peak strain in tension or compression were also performed with crack development being monitored by means of electrical potential drop instrumentation. It is found that temperature, total strain range and hold period are the most influential factors on short creep-fatigue crack propagation rates and specimen life. In order to establish a reliable relationship to represent subcritical crack development for high temperature component integrity assessment, the effectiveness of candidate correlating parameters such as cyclic strain range, cyclic J integral and strain energy density factor have been evaluated. Their application to circumstances involving short crack development due to fatigue, and interacting and non-interacting creep loading are evaluated with reference to the evidence determined from post-test metallurgical examination.

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“…Thereafter, the fatigue crack propagates into the subsurface, usually along a path perpendicular to the loading direction. This stage is of major importance since a large fraction of component life can be spent in propagating a PSC into an LC [4,26,27] when the crack is no longer contained within the cyclic plastic zone. Crack sizes greater than the cyclic plastic zone size are typically regarded as long cracks (LCs).…”

Section: Short Crack Growthmentioning

confidence: 99%

“…In such circumstances, DJ corresponds to the part of the cycle for which the crack is open [27]. Accurate J-integral determinations require FE calculation (e.g., Shih and Hutchinson [31]), in particular for component analysis.…”

Section: Short Crack Growthmentioning

confidence: 99%

Short Creep-Fatigue Crack Growth in an Advanced 9 %Cr Steel

Yan

Holdsworth

Kühn

et al. 2014

Materials Performance and Characterization

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While the development of short cracks due to cyclic elastic loading has been relatively widely studied, in particular at room temperature, their consideration for cyclic inelastic loading at high temperatures and lower frequencies is not so common. Short creep-fatigue crack growth rates may be correlated in terms of cyclic strain range, cyclic J-integral or strain energy density factor, with appropriate allowance for associated creep damage accumulation. Candidate approaches are evaluated with reference to test results generated for an advanced 9 %Cr turbine rotor steel. This paper promotes the use of cyclic strain range and strain energy density factor relative to other candidate correlating parameters in relation to the results of a series of 30 min hold time creep-fatigue tests performed using fully instrumented uniaxial specimens with short crack starters. The focus of the testing campaign is an advanced 9 %Cr turbine rotor steel at temperatures of 600 and 625 C.

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Derivation of a Low-Cycle Fatigue Relationship Employing the J-Integral Approach to Crack Growth

Cited by 27 publications

References 5 publications

Influence of residual thermal stresses on fatigue crack growth life of discontinuous reinforcements in metal matrix composites

Influence of residual thermal stresses on fatigue crack growth life of discontinuous reinforcements in metal matrix composites

Creep–fatigue crack development from short crack starters

Short Creep-Fatigue Crack Growth in an Advanced 9 %Cr Steel

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