Creep–fatigue crack development from short crack starters

Yan, Wentao; Holdsworth, S.R.; Kühn, Ingo; Mazza, Edoardo

doi:10.1179/0960340914z.00000000053

Cited by 8 publications

(4 citation statements)

References 39 publications

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“…In every case of test schemes mentioned earlier, pronounced softening phenomenon has been observed. As reported in earlier literature, softening in case of creep‐fatigue interaction is much more vigorous than continuous fatigue tests, and this can be attributed to the pronounced tendency of forming subgrain, ie, low energy structures with decreasing dislocation density inside subgrains.…”

Section: Resultssupporting

confidence: 55%

Low‐cycle fatigue of IN 718: Effect of waveform

Barat

Sivaprasad

Kar

et al. 2019

Fatigue Fract Eng Mat Struct

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The influence of various strain waveforms on the low‐cycle fatigue of IN 718 tested at 650°C has been investigated. The straining paths are accompanied by dwell‐induced creep component(s) or unequal strain distribution in different portions of cycles reducing strength of material. The investigation intends to clarify mainly mechanistic aspects of relaxation‐fatigue interaction. Features of time‐dependent effect induced by nonpeak dwell and the same accompanied by peak dwell, slow unloading from the peak to a lower strain, and different loading and unloading rates are compared in terms of stress amplitude responses, mean stress relaxation, hysteresis loops, life, and damage parameter DC‐F. Softening is common in all the cases, and degree of softening varies linearly with life. The energy‐based life prediction model has been found to work well for the data, and we have introduced energy fraction–based approach to observe simultaneous contribution from both creep and fatigue on life.

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Section: Resultssupporting

confidence: 55%

Low‐cycle fatigue of IN 718: Effect of waveform

Barat

Sivaprasad

Kar

et al. 2019

Fatigue Fract Eng Mat Struct

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“…In the short crack regime ( Figure 7 a), creep-fatigue crack growth rates may be expressed as a function of total strain range, as in Equation (4) [ 16 , 17 , 18 , 19 ], although other correlating parameters may be employed [ 19 ].

…”

Section: Mechanical Analysis Of Creep-fatigue Crackingmentioning

confidence: 99%

“…An example of short-crack creep-fatigue crack growth data for a cast 1¼CrMoV steel at 550 °C is shown in Figure 9 . Data for martensitic steels are given in [ 7 , 19 ].…”

Section: Mechanical Analysis Of Creep-fatigue Crackingmentioning

confidence: 99%

Creep-Fatigue Failure Diagnosis

Holdsworth

2015

Materials

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Failure diagnosis invariably involves consideration of both associated material condition and the results of a mechanical analysis of prior operating history. This Review focuses on these aspects with particular reference to creep-fatigue failure diagnosis. Creep-fatigue cracking can be due to a spectrum of loading conditions ranging from pure cyclic to mainly steady loading with infrequent off-load transients. These require a range of mechanical analysis approaches, a number of which are reviewed. The microstructural information revealing material condition can vary with alloy class. In practice, the detail of the consequent cracking mechanism(s) can be camouflaged by oxidation at high temperatures, although the presence of oxide on fracture surfaces can be used to date events leading to failure. Routine laboratory specimen post-test examination is strongly recommended to characterise the detail of deformation and damage accumulation under known and well-controlled loading conditions to improve the effectiveness and efficiency of failure diagnosis.

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“…To that end, Yan et al [5] measured the propagation of a crack by means of current monitoring over its area. This relies on the fact that the voltage measured over a crack relates to the area of material in the cross section.…”

Section: Introductionmentioning

confidence: 99%

Controlled Creation of Contact Cracks in Additive Manufactured Components

Preston,

Ashour,

Wright

et al. 2023

Applied Sciences

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Techniques for the controlled seeding and growth of cracks are urgently required for non-destructive testing technique evaluation, particularly for additive manufactured (AM) samples. This paper describes a method that uses a combination of the tensile load and the resonance excitation of notched AM samples, with in situ monitoring of the resonance frequency serving to track the crack dimensions. Mechanical low-cycle fatigue cracks, ranging in length from ~0.3 mm to ~5 mm, were successfully created in five AM samples using this technique. The samples were non-destructively characterized using optical microscopy and Nonlinear Resonance (NLR) testing. The exploitation of resonance enabled the concentration of a significant number of stress cycles on the samples in much shorter timespans than conventional fatigue testing, enabling a high throughput while utilizing compact components. Furthermore, the tracking of the resonance frequency shift throughout the process enabled non-invasive and no-contact real-time condition monitoring.

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Creep–fatigue crack development from short crack starters

Cited by 8 publications

References 39 publications

Low‐cycle fatigue of IN 718: Effect of waveform

Low‐cycle fatigue of IN 718: Effect of waveform

Creep-Fatigue Failure Diagnosis

Controlled Creation of Contact Cracks in Additive Manufactured Components

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