Bounds on the fatigue threshold in metals

Tirosh, J.; Peles, Sharon

doi:10.1016/s0022-5096(00)00076-4

Cited by 6 publications

(3 citation statements)

References 25 publications

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“…In the paper written by Zerbst [ 17 ], the size of a cyclic plastic zone was determined to be approximately one tenth of the size of the plastic zone under plane strain conditions, as follows [ 21 ]:

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Section: Discussionmentioning

confidence: 99%

Investigation on the Fatigue Crack Propagation of Medium-Entropy Alloys with Heterogeneous Microstructures

et al. 2022

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The behavior and the mechanism of fatigue crack propagation in CrCoNi medium-entropy alloys (MEAs) with heterogeneous microstructures were investigated in this paper. After cold-rolling and recrystallization annealing at different temperatures and times, five sets of heterostructured specimens were acquired with different recrystallization levels. Then, the structure characterizations of these five sets of specimens were carried out by nanoindentation testing and electron back-scatter diffraction (EBSD) mapping. Finally, the fatigue crack propagation tests were conducted on single edge crack specimens of these different heterogeneous microstructures. The experimental results indicate that the crack propagation rates of specimens with partial recrystallization microstructures are higher than those with complete recrystallization microstructures, and the effect on fatigue crack thresholds of these specimens is the opposite. The fatigue cracks grow along the slip planes or twin boundaries in recrystallization grains (RGs), which induced crack deflections and the roughness-induced crack closure effect. For this reason, the area percentage of recrystallization and the grain size of RGs have a great effect on the value of the fatigue crack growth threshold.

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…”

Section: Discussionmentioning

confidence: 99%

Investigation on the Fatigue Crack Propagation of Medium-Entropy Alloys with Heterogeneous Microstructures

et al. 2022

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“…However, for many engineering applications including rolling contact, the crack growth near the threshold value is of vital interest when it comes to defining an acceptable crack size. Examples of other approaches to the crack growth problem are found in the two recent papers 33,34 …”

Section: Discussionmentioning

confidence: 99%

“…Examples of other approaches to the crack growth problem are found in the two recent papers. 33,34 The present method is deemed to have potential for further development. In a planned project, the method will be studied experimentally using a special notched specimen subject to cyclic loading.…”

Section: O N C L U D I N G R E M a R K Smentioning

confidence: 99%

Elastoplastic modelling of subsurface crack growth in rail/wheel contact problems

Lundén

2007

Fatigue Fract Eng Mat Struct

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A B S T R A C T Propagation of small subsurface cracks subjected to shear under repeated rolling contact load is studied. An analytical crack model (Dugdale) with plastic strips at the two crack tips is employed. Compressive stresses promoting crack closure and friction between crack faces are considered. The triaxial stress state is used in the yield criterion. A damage criterion is suggested based on experimental LCF data. In a numerical study, critical crack lengths are found below which propagation of an existing crack should be effectively suppressed.Keywords crack propagation; strip-yield model; subsurface crack.crack length including plastic zone (mm) D = ductility (−) E = elastic modulus (GPa) f = coefficient of friction between crack faces (−) G = shear modulus (GPa) K II = mode II stress intensity factor (MPa √ m) n = number of loading cycles N = number of loading cycles to failure p = contact pressure or pressure perpendicular to crack (MPa) p 0 = maximum pressure under contact load (MPa)s = arc length co-ordinate along crack face (mm) t d = thickness of plastic zone (mm) u 1 , u 2 = displacement along crack of upper (1) and lower (2) crack face (mm) v = speed of rolling contact load (m s −1 ) Oxyz = local co-ordinate system at crack O x y z = global co-ordinate system for rolling contact x p = horizontal position of rolling load (mm) z c = vertical position of crack (mm) γ = shear strain (−) K II = range (i.e. double amplitude) of mode II stress intensity factor (MPa √ m) K II,th = threshold value of mode II stress intensity factor (MPa √ m) ε = normal strain (−) ε = range (i.e. double amplitude) of normal strain (−) µ = friction coefficient in rolling contact zone (−)

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About the fatigue crack propagation threshold of metals as a design criterion – A review

Zerbst

Vormwald

Pippan

et al. 2016

Engineering Fracture Mechanics

220

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Bounds on the fatigue threshold in metals

Cited by 6 publications

References 25 publications

Investigation on the Fatigue Crack Propagation of Medium-Entropy Alloys with Heterogeneous Microstructures

Investigation on the Fatigue Crack Propagation of Medium-Entropy Alloys with Heterogeneous Microstructures

Elastoplastic modelling of subsurface crack growth in rail/wheel contact problems

About the fatigue crack propagation threshold of metals as a design criterion – A review

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