Cyclic Crack Growth under Repeated Rolling Contact

Yoshimura, Humberto Naoyuki; Rubin, C.A.; Hahn, G. T.

doi:10.1007/978-94-009-5085-6_23

Cited by 5 publications

(2 citation statements)

References 14 publications

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“…8 These stresses make the influence of friction between the crack faces important. 10,12,13 One reason for this friction can be that the crack faces undergo plastification due to their high mutual contact stresses. 14 References [15,16] list some other relevant articles on the mode II problem.…”

Section: N O M E N C L a T U R Ementioning

confidence: 99%

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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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Section: N O M E N C L a T U R Ementioning

confidence: 99%

“…The compressive stresses under a rolling contact load have a strong influence on the propagation mode 8 . These stresses make the influence of friction between the crack faces important 10,12,13 . One reason for this friction can be that the crack faces undergo plastification due to their high mutual contact stresses 14 .…”

Section: Introductionmentioning

confidence: 99%