Part-through cracks in round bars under cyclic combined axial and bending loading

Carpinteri, Andrea; Brighenti, Roberto

doi:10.1016/0142-1123(95)00076-3

Cited by 82 publications

(46 citation statements)

References 13 publications

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“…12.d). A similar phenomenon was already described by other authors both experimentally and numerically [7,8,11,15,16]. …”

Section: Influence Of Rotary Bending and Initial Crack Shapesupporting

confidence: 71%

“…A particular focus is put on damage tolerance analyses, which use the typical tools of fracture mechanics, fatigue crack growth and statistics [3][4][5][6]. There is a wide range of SIF solutions for cracks in round bars and pipes subjected to different load conditions [7][8][9][10], however, few of these refer to cracks at notches [11] and almost no solutions are available which cover the geometry and dimensions of hollow railway axles.…”

Section: Introductionmentioning

confidence: 99%

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An investigation on the influence of rotary bending and press fitting on stress intensity factors and fatigue crack growth in railway axles

Madia¹,

Beretta²,

Zerbst³

2008

Engineering Fracture Mechanics

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The present paper summarizes the results of fatigue crack growth investigations on a hollow railway axle which were performed as a joint research project between the Politecnico di Milano, Italy, and the GKSS Research Centre Geesthacht, Germany, in the frame of an ESIS-TC24 activity. Since no analytical K factors (SIF) solutions for semi-elliptical surface cracks in the S-transitions of railway axles were available, the first step in the research was to generate them for both reverse and rotary bending. The results were then used to investigate the effects of rotary bending and of the press fits at the wheel and gear on the fatigue crack growth and residual lifetime so as to provide essential input information for setting up inspection intervals. It was found that the effect of rotary bending, although existent, was rather moderate whereas the press fits had a large and detrimental effect.

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“…12.d). A similar phenomenon was already described by other authors both experimentally and numerically [7,8,11,15,16]. …”

Section: Influence Of Rotary Bending and Initial Crack Shapesupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

An investigation on the influence of rotary bending and press fitting on stress intensity factors and fatigue crack growth in railway axles

Madia¹,

Beretta²,

Zerbst³

2008

Engineering Fracture Mechanics

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“…As the crack propagates through a round specimen bar, the crack shape factor β increases, mainly because the ligament area reduces. The round bar crack through stress intensity factor problem has been widely investigated, even recently, through Finite Element (FE) [39][40][41][42][43]24]. In these papers particular attention was devoted to the crack shape evolution, when the crack propagates inside the round bar, for different initial elliptical crack aspect ratios.…”

Section: Fatigue Crack Initiation From S-n Curvesmentioning

confidence: 99%

Physically short crack propagation in metals during high cycle fatigue

Santus

Taylor

2009

International Journal of Fatigue

109

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In metals, during high cycle fatigue on plain specimens, almost the entire fatigue life is spent as short crack initiation and propagation. The fatigue short crack life can be schematically divided into two subsequent phases: microstructurally short crack and physically short crack. Recently, Chapetti proposed a physically short crack threshold and propagation driving force model [1]. In his model the physically short crack behavior is obtained from the long crack propagation, just introducing the reduced threshold due to unsaturated closure. In the present paper the physically short crack propagation is similarly modeled by means of a driving force equation, but independent from the long crack propagation. In this way, a better description of the short crack behavior is provided, however short crack propagation data is required. Physically short crack propagation model parameters were obtained, by fitting experimental data drawn from the literature, for two Aluminum alloys and a Titanium alloy at two different heat treatment conditions and load ratios. By calculating the physically short crack plus long crack propagation, and assuming microstructurally short crack as part of the initiation stage, a purer information about crack initiation can be drawn from the S − N curves, and it is shown in the paper for the investigated materials. A precise crack initiation size and the number of cycles just for initiation are then provided. This information is useful to accurately predict fatigue life for blunt notched and for thick components, where the propagation is much higher than in the small plain specimen. A validation of the model was obtained by predicting the fatigue life of a notched specimen. An accurate prediction was obtained both when the initiation was much smaller than propagation and when almost the entire fatigue life was initiation.

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“…A careful consideration should be taken if the cylinder contains a defect like a 'shallow surface crack' with a straight crack front shape or with a smaller crack aspect ratio. Previous studies on the crack shape evolutions of a surface crack in smooth and notched cylinders have been reported (Carpinteri, 1993;Carpinteri and Brighenti, 1996;Lin and Smith, 1998;Carpinteri et al, 2006;2013). They used linear Paris's equation for the crack growth simulations.…”

Section: Resultsmentioning

confidence: 99%

“…Raju et al (1986) calculated the SIFs of a semi-elliptical crack using a 3D-finite element method (FEM). Carpinteri and Brighenti (1996) reported the fatigue crack growths using Paris's law for three different model parameters (ellipse aspect ratio, crack depth ratio, and ellipse shifting ratio). Shih and Chen (2002) used the ANSYS finite element analysis (FEA) software to evaluate the SIFs of an elliptical crack in a round bar by introducing collapsed singular elements.…”

Section: Introductionmentioning

confidence: 99%

Fatigue growth of a surface crack in a V-shaped notched round bar under cyclic tension

Chandra

Purbolaksono

Nukman

et al. 2014

J. Zhejiang Univ. Sci. A

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This paper presents modeling results for fatigue crack growths of a semi-elliptical surface crack in a V-shaped notched round bar under uniform cyclic tension. All the analyses were carried out by using a software package featuring the boundary element method. The J-integral technique was used to compute the stress intensity factors (SIFs), and the NASGRO crack growth rate was chosen to simulate the fatigue crack growths. Mechanical and fracture properties of AZ-6A-T5 magnesium alloy were used for our analysis. Crack shape evolutions for different crack aspect ratios and the corresponding SIFs may be correlated to study the behavior of crack growths. An unstable crack growth was observed when the evolving crack aspect ratio was between 0.6 and 0.7. Careful consideration should be taken if the cylinder contains a defect which has a straight shape on the crack front or a smaller crack aspect ratio.

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Part-through cracks in round bars under cyclic combined axial and bending loading

Cited by 82 publications

References 13 publications

An investigation on the influence of rotary bending and press fitting on stress intensity factors and fatigue crack growth in railway axles

An investigation on the influence of rotary bending and press fitting on stress intensity factors and fatigue crack growth in railway axles

Physically short crack propagation in metals during high cycle fatigue

Fatigue growth of a surface crack in a V-shaped notched round bar under cyclic tension

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