Effect of mean shear stress on the fatigue strength of notched components under multiaxial stress state

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dc.contributor.author BENNEBACH, Mohamed
ensam.hal.laboratories
  230660 CEntre Technique des Industries Mécaniques [CETIM]
dc.contributor.author PALIN-LUC, Thierry
ensam.hal.laboratories
  166940 Institut de Mécanique et d'Ingénierie de Bordeaux [I2M]
dc.contributor.author MESSAGER, Alexandre
ensam.hal.laboratories
  166940 Institut de Mécanique et d'Ingénierie de Bordeaux [I2M]
dc.date.accessioned 2018-07-13T08:08:23Z
dc.date.available 2018-07-13T08:08:23Z
dc.date.issued 2018
dc.date.submitted 2018-06-30T09:17:34Z
dc.identifier.uri http://hdl.handle.net/10985/13395
dc.description.abstract The effect of a static and intermittent shear stress on the HCF strength of two quenched and tempered steel grades used to produce shafts in crane industry was studied on notched specimens (Kt=1.7 and 2.7) for being representative of critical areas. Three main load cases were considered: C1=rotative bending (RB), C2=RB and static torsion and C3=RB and mean torsion fluctuating in blocks to simulated start and stop cycles. In this last case the first investigated mean shear stress, τm, was equal to the material yield stress in pure shear, τy. Additional C3 variants were investigated too where τm was equal to 0.3τy and 0.7τy. It has been shown that τm has little effect on the rotating bending HCF strength at 3×106 cycles. For both steel grades and notch geometries studied, the results of the fatigue tests confirm that the influence of a static torsion on the rotating bending HCF strength is negligible even when the static torsion level is equivalent to the yield strength of the material in torsion. However, in intermittent service conditions (C3), it has been shown that torsion cycles can affect significantly the HCF strength in RB, depending on the notch acuity and torsion level. Elastic-plastic cyclic FEA has been done for the two specimen geometries to assess the stabilized stress-strain state at the notch root and then to compute the fatigue life by using the multiaxial HCF life models proposed by: Fatemi-Socie, Smith-Watson-Topper, and Wang-Brown. The Palmgreen-Miner hypothesis was used to cumulate damage mainly because of its simplicity for design purposes. According to our simulations and with the chosen cumulative damage rule, none of the tested fatigue life calculation methods give good results for all the load cases. The efficiency of the tested methods is very dependent on both the material and the load cases. However, the Smith-Watson-Topper approach gives the best results whereas the Fatemi-Socie models leads to the more conservative ones except in one load case en
dc.language.iso en
dc.publisher Elsevier
dc.rights Post-print
dc.subject multiaxial loading en
dc.subject notched component en
dc.subject variable amplitude en
dc.subject mean shear stress en
dc.subject fatigue life en
dc.subject combined bending and torsion en
dc.title Effect of mean shear stress on the fatigue strength of notched components under multiaxial stress state en
ensam.hal.id hal-01838096 *
ensam.hal.status accept *
dc.typdoc Communications avec actes
dc.localisation Centre de Bordeaux-Talence
dc.subject.hal Sciences de l'ingénieur: Mécanique
dc.subject.hal Sciences de l'ingénieur: Mécanique: Génie mécanique
dc.subject.hal Sciences de l'ingénieur: Mécanique: Mécanique des solides
dc.subject.hal Sciences de l'ingénieur: Mécanique: Mécanique des structures
ensam.audience Internationale
ensam.conference.title 7th International Conference on Fatigue Design
ensam.conference.date 2017-11-29
ensam.country France
ensam.title.proceeding Proceedia Engineering
ensam.page 25-35
ensam.volume 213
ensam.city Senlis
ensam.peerReviewing Oui
ensam.invitedCommunication Oui
ensam.proceeding Oui

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