Fatigue lives for induction hardened shafts with subsurface crack initiation

Tjernberg, A.

doi:10.1016/s1350-6307(00)00036-4

Cited by 19 publications

(12 citation statements)

References 12 publications

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“…The other end of the specimen is gripped by a long arm (7). This arm is loaded vertically by a sinusoidal vertical force generated by an electromagnetic shaker (5). The specimen is seen by the electronic control system as a spring loaded in bending without shear force (pure bending).…”

Section: Fatigue Test Conditionsmentioning

confidence: 99%

“…However, the effectiveness of residual stresses is quite dependent on their distribution in the component and on their relaxation (if any) during in-service fatigue loading. Depending on both the field of residual stresses and the applied external fatigue loading, cracks can either initiate in the vicinity of the surface or beneath the hardened layer [5]. The great importance of residual stresses to the fatigue strength of materials and structures is now well known.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of multiaxial fatigue strength of steel component treated by surface induction hardening and comparison with experimental results

Palin‐Luc

Coupard

Dumas

et al. 2011

International Journal of Fatigue

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. This paper proposes a method to assess the high-cycle multiaxial fatigue strength of components treated by surface induction hardening (SIH). Surface quenching following surface induction heating is simulated, taking into account the following features of the process: (i) electromagnetic and thermal fields, (ii) phase transformation, and (iii) the residual stress field resulting from the entire process. The fatigue strength of the specimens was simulated using Crossland and Dang-Van criteria; the field of the residual stresses and the fatigue characteristics of both the untreated material and the treated layer (martensite) are considered. Fatigue tests on smooth specimens were carried out to compare simulated results with experimental data. These tests yield information regarding the influence of the thermal treatment on material behaviour and strength, including microstructure evolution and mechanical characteristics, especially in fatigue. For this purpose, residual stresses were analyzed by X-ray diffraction before and after the fatigue tests. Fatigue crack initiation areas (at the specimen's surface or below) are predicted depending on the depth of the hardened material layer. The simulation of the fatigue strength at 2 Â 10 6 cycles is in good agreement with experimental results.

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Section: Fatigue Test Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Simulation of multiaxial fatigue strength of steel component treated by surface induction hardening and comparison with experimental results

Palin‐Luc

Coupard

Dumas

et al. 2011

International Journal of Fatigue

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show abstract

“…Yin and Fatemi (in press, 2009) also reported subsurface crack initiation in long life regime of casehardened steel specimens under axial cycles. A study by Tjernberg (2002) indicates that a proper hardening process eliminates detrimental effects of tensile residual stresses at the core section.…”

Section: Introductionmentioning

confidence: 99%

Effects of continuous cast section size on torsion deformation and fatigue of induction hardened 1050 steel shafts

Cryderman¹,

Shamsaei²,

Fatemi³

2011

Journal of Materials Processing Technology

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“…Tipton and Nelson 6 reviewed strategies for considering notch geometries and subsurface multiaxial stress and strain distributions in fatigue life using different multiaxial life prediction approaches. To consider the axial and hoop residual stresses in case‐hardened shafts under cyclic loading, multiaxial fatigue critical plane approaches have been used in a number of studies 7–10 …”

Section: Introductionmentioning

confidence: 99%

Effect of hardness on multiaxial fatigue behaviour and some simple approximations for steels

Shamsaei

Fatemi

2009

Fatigue Fract Eng Mat Struct

113

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A B S T R A C T Constant-amplitude in-phase and 90 • out-of-phase axial-torsional fatigue tests were conducted on tubular specimens made from a medium-carbon steel with three hardness levels obtained from normalizing, quenching and tempering and induction hardening to find the effect of hardness on multiaxial fatigue behaviour. In addition, the same loadings were applied on the normalized solid specimens to investigate the effect of specimen geometry on multiaxial fatigue life. Similar fatigue life variation as a function of hardness was found for in-phase and out-of-phase loadings, with higher ductility beneficial in low-cycle fatigue (LCF) and higher strength beneficial in high-cycle fatigue (HCF). Multiaxial fatigue data were satisfactorily correlated for all hardness levels with the Fatemi-Socie parameter. Furthermore, in order to predict multiaxial fatigue life of steels in the absence of any fatigue data, the Roessle-Fatemi hardness method was used. Multiaxial fatigue lives were predicted fairly accurately using the Fatemi-Socie multiaxial model based on only the hardness level of the material. The applicability of the prediction method based on hardness was also examined for Inconel 718 and a stainless steel under a wide range of loading conditions. The great majority of the observed fatigue lives were found to be in good agreement with predicted lives.Keywords hardness effect on fatigue life; life prediction; multiaxial fatigue. N O M E N C L A T U R EA = specimens' cross-section area b = axial fatigue strength exponent b • = shear fatigue strength exponent b = equivalent fatigue strength exponent c = axial fatigue ductility exponent c • = shear fatigue ductility exponent c = equivalent fatigue ductility exponent E = modulus of elasticity G = shear modulus HB = Brinell hardness k = material constant in the Fatemi-Socie parameter 2N f = reversals to failure r m = mid-section radius T = torque ε = axial strain ε e = elastic axial strain ε p = plastic axial strain ε = equivalent strainCorrespondence: Ali Fatemi.

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Fatigue lives for induction hardened shafts with subsurface crack initiation

Cited by 19 publications

References 12 publications

Simulation of multiaxial fatigue strength of steel component treated by surface induction hardening and comparison with experimental results

Simulation of multiaxial fatigue strength of steel component treated by surface induction hardening and comparison with experimental results

Effects of continuous cast section size on torsion deformation and fatigue of induction hardened 1050 steel shafts

Effect of hardness on multiaxial fatigue behaviour and some simple approximations for steels

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