A computer model for fatigue crack growth from rough surfaces

Andrews, Scott; Şehitoğlu, Hüseyin

doi:10.1016/s0142-1123(00)00018-9

Cited by 58 publications

(39 citation statements)

References 8 publications

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“…From a fracture mechanics point of view, small tip radii are linked with shorter fatigue lives [16]. Regarding the notch spacing effect on fatigue life, literature shows that shorter notch spacing suggests longer lives due to the so called 'notch interference effect' [6].…”

Section: Figmentioning

confidence: 99%

“…Fatigue life is strongly dependant on surface roughness when the average asperity heights exceed the intrinsic defects in material [16]. The height descriptor parameters are therefore necessary for surface characterization of fatigue specimens.…”

Section: Height Parametersmentioning

confidence: 99%

“…As mentioned in the section 2, the characterization should include however, other parameters in order to characterize all attributes that affects fatigue life. As demonstrated by Andrews et al, the average fatigue life decreases with increasing the standard deviation in asperity heights [16]. Therefore, the root mean square height parameter, which corresponds to the standard deviation of heights, should also be included in the analysis:…”

Section: Height Parametersmentioning

confidence: 99%

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The use of areal surface topography characterisation in relation to fatigue performance

et al. 2018

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Abstract. Although the effect of surface topography on fatigue life is widely accepted, the underlying role of surface roughness from first principles is still poorly understood. Currently approaches which consider the influence of surface roughness on fatigue life prediction can be broadly classified into surface corrector factors (C s ) and stress concentration factors (K t ). Those approaches describe the surface according to the manufacturing process (machined, grounded…), or using 2D height descriptor parameters (R a , R z ...). However, these approaches are not able to correctly describe the effect of roughness on the fatigue performance where it is anticipated a richer set of surface descriptors would show correlation. The present work aims to highlight the inherent limitations of the most commonly employed 2D surface measurement and characterization techniques, and provides an insight into the application of 3D areal surface characterization processes including the use of the latest areal surface topography parameters quantifying amplitude, spatial, and hybrid topographical information which is considered to be important for fatigue performance correlation.

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Section: Figmentioning

confidence: 99%

Section: Height Parametersmentioning

confidence: 99%

Section: Height Parametersmentioning

confidence: 99%

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The use of areal surface topography characterisation in relation to fatigue performance

et al. 2018

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“…Persson et al [10] indicate the Gaussian nature of the height distribution of natural surfaces, such as surfaces prepared by fracture or sputtering, while polished rough surfaces show a non-symmetric height distribution. Andrews and Sehitoglu [29] propose a log-normal distribution for the asperity height, tip radius and horizontal position. However, Lampaert [25] shows that the type of distribution has only a minor influence on the hysteresis friction behaviour.…”

Section: The Contact Scenariomentioning

confidence: 99%

A Generalised Asperity-Based Friction Model

2010

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Despite considerable research effort, the use of physics-based modelling to predict frictional behaviour is still a debatable question in modern tribological research. This article presents a dry-friction model, based on physical phenomena such as adhesion, elastic-plastic contact and deformation. This contribution offers a means to simulate all kinds of frictional behaviour that is observed in experimental research. The contact of two bodies through their surfaces is transformed into the contact of a body that is provided with asperities and containing material and geometrical information of both of the mating surfaces, and a counter profile, holding solely geometrical information. The local adhesion between the asperity tips and the counter profile, together with the elastic-plastic behaviour of the asperities themselves, form the basis for this model. The simulation results show qualitatively good agreement with experimental study. Friction and contact phenomena such as normal creep, increasing static coefficient of friction with increasing dwell time, pre-sliding hysteresis with nonlocal memory, Stribeck and viscous effect, frictional lag, stick-slip and dynamical oscillations are revealed by this model. Furthermore, future improvement and refinement of the model is possible (and ongoing) so as to incorporate lubrication and asperity wear.

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“…On the other hands, the effect of higher roughness level should be considered as a notch. Andrews and Sehitoglu (2000) proposed the prediction method for fatigue life with two geometry parameters, notch depth ( = the distance from the average line to the valley root ) and notch root radius, considering crack closure phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Fatigue limit reliability of axisymmetric complex surface

Aono

Noguchi

2005

Int J Fract

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In this paper, a method to predict fatigue limit reliability of specimens with 2D complex rough surface is proposed. First, a effective surface profile on fatigue limit is proposed. This is obtained from the ineffective crack length against the fatigue limit. Next, an equivalent notch depth is proposed to replace a rough profile to a smooth profile with a notch. To calculate the stress concentration of the notch and to determine the equivalent notch depth, an exact solution is given for a problem of an infinite plate with a complex profile under tension. The solution is obtained with the complex variable method. Finally, a method to predict the fatigue limit reliability is discussed. The Linear Notch Mechanics and √ area parameter model is used to predict the fatigue limit of a smooth profile with a notch, and then the fatigue limit reliability is estimated with the fatigue limit of many simulated surfaces. Moreover, rotating bending fatigue tests of 0.1% carbon steel with a complex surface are carried out. The experimental fatigue limit data is compared with the present estimated value. As results, the validity of the present method is examined.

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A computer model for fatigue crack growth from rough surfaces

Cited by 58 publications

References 8 publications

The use of areal surface topography characterisation in relation to fatigue performance

The use of areal surface topography characterisation in relation to fatigue performance

A Generalised Asperity-Based Friction Model

Fatigue limit reliability of axisymmetric complex surface

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