The effect of machined topography and integrity on fatigue life

Novovic, Donka; Dewes, R.C.; Aspinwall, D.K.; Voice, W.; Bowen, P.

doi:10.1016/j.ijmachtools.2003.10.018

Cited by 375 publications

(225 citation statements)

References 28 publications

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“…The effect of surface roughness on fatigue life is already well documented [11,33,34] and as such is not the focus of this paper, since it has previously been concluded [34] that for roughness values in the range 2.5 < R a < 5 μm, workpiece residual stress and surface microstructure dominate. However, roughness is reported in the present study since it has been shown that for stress relieved AISI4140, even low surface roughnesses R a = 1.4 μm had a detrimental effect compared to polished samples at R a = 0.3 μm.…”

Section: Low Cycle Fatiguementioning

confidence: 97%

The effect of shot peening on notched low cycle fatigue

Soady

Mellor

Shackleton

et al. 2011

Materials Science and Engineering: A

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The improvement in low cycle fatigue life created by shot peening ferritic heat resistant steel was investigated in components of varying geometries based on those found in conventional power station steam turbine blades. It was found that the shape of the component did not affect the efficacy of the shot peening process, which was found to be beneficial even under the high stress amplitude three point bend loads applied. Furthermore, by varying the shot peening process parameters and considering fatigue life it has been shown that the three surface effects of shot peening; roughening, strain hardening and the generation of a compressive residual stress field must be included in remnant life models as physically separate entities. The compressive residual stress field during plane bending low cycle fatigue has been experimentally determined using X-ray diffraction at varying life fractions and found to be retained in a direction parallel to that of loading and to only relax to 80% of its original magnitude in a direction orthogonal to loading. This result, which contributes to the retention of fatigue life improvement in low cycle fatigue conditions, has been discussed in light of the specific stress distribution applied to the components. The ultimate aim of the research is to apply these results in a life assessment methodology which can be used to justify a reduction in the length of scheduled plant overhauls. This will result in significant cost savings for the generating utility. KeywordsLow cycle fatigue, stress concentration, shot peening, residual stresses, ferritic heat resisting

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Section: Low Cycle Fatiguementioning

confidence: 97%

The effect of shot peening on notched low cycle fatigue

Soady

Mellor

Shackleton

et al. 2011

Materials Science and Engineering: A

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“…It has been reported that thermochemical processes, such as nitriding, and mechanical surface treatments such as roller burnishing, can induce subsurface fatigue crack nucleation [45][46][47][48][49]. This has been attributed to the compressive-tensile stress profile generated below the surface of the material.…”

Section: Fracture Topographymentioning

confidence: 99%

Evaluating the effects of plasma diffusion processing and duplex diffusion/PVD-coating on the fatigue performance of Ti–6Al–4V alloy

Cassar

Wilson²,

Banfield

et al. 2011

International Journal of Fatigue

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a b s t r a c tThe effect of triode-plasma enhanced low-pressure oxygen and/or nitrogen diffusion treatments, either as a single process or in conjunction with plasma-assisted physical vapour deposition (PAPVD) on Ti6Al-4V has been studied under rotating-bending fatigue testing. Following the diffusion treatment, samples exhibit a hardened case, more than 30 lm deep. Semi-logarithmic S-N plots are used to demonstrate and compare the significant changes in fatigue resistance obtained from each process. Fractography and residual stress measurements show that, compared to annealed samples, the fatigue strength of the diffusion-treated samples was superior; although the result changed depending on the processing parameters and microstructure of the substrate material. Also, unsupported and mechanically uncompliant ceramic coatings, such as TiN, promote the initiation of multiple crack sites, which lead to premature failure of the Ti-alloy substrate and a consequent reduction in endurance limit.

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“…For this application, Sq, Sk, Svk, Sds, Sbi are more significant to describe oil consumption whereas Sv, Svi are well-adapted for blow-by [7]. Concerning the fatigue limit, it seems more interesting to consider Sq, Std and Sal [8]. The use of 3D parameters to characterize 3D surface topography is now efficient.…”

Section: Introductionmentioning

confidence: 99%

Model for the prediction of 3D surface topography in 5-axis milling

Lavernhe

Quinsat

Lartigue

2010

Int J Adv Manuf Technol

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Abstract:The paper deals with the prediction of the 3D surface topography obtained in 5-axis milling in function of the machining conditions. For this purpose, a simulation model for the prediction of machined surface patterns is developed based on the well-known N-buffer method. As in sculptured surface machining the feed rates locally vary, the proposed model can be coupled to a feed rate prediction model. Thanks to the simulation model of 3D surface topography, the influence of the machining strategy on resulting 3D surface patterns is analyzed through an experimental design. Results enhance the major influence of the tool inclination on 3D topography. Surface parameters used in the study are strongly affected by the variation of the yaw angle. The effect of the feed rate is also significant on amplitude parameters. Finally, the analysis brings out the interest of using surface parameters to characterize 3D surface topography obtained in 5-axis milling.

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The effect of machined topography and integrity on fatigue life

Cited by 375 publications

References 28 publications

The effect of shot peening on notched low cycle fatigue

The effect of shot peening on notched low cycle fatigue

Evaluating the effects of plasma diffusion processing and duplex diffusion/PVD-coating on the fatigue performance of Ti–6Al–4V alloy

Model for the prediction of 3D surface topography in 5-axis milling

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