Fatigue crack path and threshold in Mode II and Mode III loadings

Murakami, Yukitaka; Fukushima, Yoshihiro; Toyama, K.; Matsuoka, Saburo

doi:10.1016/j.engfracmech.2007.01.030

Cited by 51 publications

(12 citation statements)

References 14 publications

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“…However, to the authors knowledge, only Hellier et al (1987); Hellier et al (1991Hellier et al ( , 1990; ; Murakami et al (2003Murakami et al ( , 2008 and Pokluda et al (2008); Holáň et al (2009) tried to obtain such mixed-mode data or at least, as concerns Murakami et al, mode II and mode III data on the same material for a comparison. Pokluda et al (2008); Holáň et al (2009) developed a device to obtain the whole range of mode mixity along two parallel, initially circular, crack fronts in austenitic steel cylindrical specimens submitted to transverse shear.…”

Section: Introductionmentioning

confidence: 97%

“…They analysed the evolution in aspect ratio of subsurface elliptical cracks grown in mode II + III, in rolling contact fatigue Murakami et al (2008). The final aspect ratio was smaller than predicted under the assumption of similar kinetics and thresholds for mode II and mode III (crack growth was slower at the point where mode III prevailed), which they attributed to a higher shielding of mode III by crack face friction, based on finite element computations of K effective II and K effective III .…”

Section: Introductionmentioning

confidence: 97%

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3D shear-mode fatigue crack growth in maraging steel and Ti-6Al-4V

et al. 2010

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International audienceFatigue crack growth tests in mixed-mode II + III were performed on maraging steel and Ti-6Al- 4V. The 3D evolutions of the crack fronts -measured by SEM after interrupted tests- were analyzed, taking into account the reduction in effective crack driving force by the interlocking and friction of the asperities of the crack surface. Under small-scale yielding conditions, the mixed-mode crack growth rates were found to correlate best with Keff2 II + 1.2Keff2 III in maraging steel, while for Ti-6Al-4V, Keff2 II + 0.9Keff2 III appeared suitable. For extended plasticity, a crack growth prediction method is proposed and validated for Ti-6Al-4V. This method is based on elastic-plastic F.E. computations and application, ahead of each node of the crack front, of a shear-dominated fatigue criterion

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 97%

3D shear-mode fatigue crack growth in maraging steel and Ti-6Al-4V

et al. 2010

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“…Murakami et al 25,26 have suggested that the mechanism of mode III crack growth is essentially the same as the mechanism of mode II crack growth. They concluded that the crack growth resistance both in mode II and mode III is the same, i.e.…”

Section: Discussionmentioning

confidence: 99%

“…Note that this crack size effect can become of importance also in estimating the rolling contact fatigue strength from the fracture mechanics point of view because the value for a large crack gives an unconservative estimation. Murakami et al 25,26 have suggested that the mechanism of mode III crack growth is essentially the same as the mechanism of mode II crack growth. They concluded that the crack growth resistance both in mode II and mode III is the same, i.e.…”

Section: Effect Of Interference Of Crack Faces On Threshold Valuementioning

confidence: 99%

Shear mode threshold for a small fatigue crack in a bearing steel

Matsunaga

Shomura

Muramoto

et al. 2010

Fatigue &Amp; Fracture of Engineering Materials &Amp; Structures

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A B S T R A C T The fatigue behaviour of small, semi-elliptical surface cracks in a bearing steel was investigated under cyclic shear-mode loading in ambient air. Fully reversed torsion was combined with a static axial compressive stress to obtain a stable shear-mode crack growth in the longitudinal direction of cylindrical specimens. Non-propagating cracks less than 1 mm in size were obtained (i) by decreasing the stress amplitude in tests using notched specimens and (ii) by using smooth specimens in constant stress amplitude tests. The threshold stress intensity factor ranges, K IIth and K IIIth , were estimated from the shape and dimensions of non-propagating cracks. Wear on the crack faces was inferred by debris and also by changes in microstructure in the wake of crack tip. These effects resulted in a significant increase in the threshold value. The threshold value decreased with a decrease in crack size. No significant difference was observed between the values of K IIth and K IIIth . a = half crack length at specimen surface a 0 = half length of an artificial defect a np = half length of a non-propagating crack A defect = projected area of an artificial defect A crack = area of interfering crack face b = crack depth b np = crack depth of a non-propagating crack da/dN = crack growth rate at specimen surface E(k) = complete elliptic integral of the second kind f = fraction of interfering crack area to the total area of defect plus crack = A crack /(A defect + A crack ) × 100 HV = Vickers hardness k = (1 − b 2 /a 2 ) 1/2 k = aspect ratio of a crack = b/a K(k) = complete elliptic integral of the first kind K II , K III = stress intensity factors in modes II and III N = number of cycles N total = total number of cycles applied K II , K III = stress intensity factor ranges in modes II and III K IIth , K IIIth = threshold stress intensity factor ranges in modes II and III ν = Poisson's ratio σ = normal stress σ s = static compressive stress applied in the axial directionCorrespondence: H. Matsunaga.

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“…When performing a fracture mechanics-based evaluation, the fracture process must be addressed as a small crack problem [1][2][3][24][25][26][27][28][29][30][31][32]. However, although significant progress has occurred over the last two decades [4][5][6][7][8][9][10][11][12][13][14][15][16][17], the shear-mode growth behavior of a crack in hard steel is still not fully understood, especially for small cracks. Recently, under these circumstances, Matsunaga et al [1,2] performed torsional fatigue tests with static compression to measure the ranges of the threshold stress intensity factor (SIF), DK IIth and DK IIIth , for the shearmode growth of small surface cracks between approximately 0.01 and 1 mm in length in a bearing steel.…”

Section: Introductionmentioning

confidence: 99%