Effect of mean shear stress on the fatigue strength of notched components under multiaxial stress state
Communication avec acte
Date
2018Abstract
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
Files in this item
- Name:
- 2018_Bennebach_Palin-luc_Messa ...
- Size:
- 1.613Mb
- Format:
- Description:
- main paper
Related items
Showing items related by title, author, creator and subject.
-
Article dans une revue avec comité de lectureMESSAGER, Alexandre; JUNET, Arnaud; PALIN-LUC, Thierry; BUFFIERE, Jean-Yves; EL MAY, Mohamed; GAILLARD, Yves; KING, Andrew; BONNIN, Anne; NADOT, Yves; RANC, Nicolas; SAINTIER, Nicolas (Wiley-Blackwell, 2020)This work presents a new ultrasonic fatigue testing device for studying the initiation and propagation mechanisms of internal microstructurally short fatigue cracks using in situ synchrotron tomography. Its principle is ...
-
Article dans une revue avec comité de lectureRANC, Nicolas; MESSAGER, Alexandre; JUNET, Arnaud; PALIN-LUC, Thierry; BUFFIERE, Jean-Yves; SAINTIER, Nicolas; ELMAY, Wafa; MANCINI, L.; KING, Andrew; NADOT, Yves (Elsevier, 2022-09)Very high cycle fatigue fracture is often associated with internal crack propagation and one major problem to study the initiation and the propagation of this internal crack is to detect its initiation and quantify its ...
-
Article dans une revue avec comité de lectureSEDDIK, Raoudha; RONDEPIERRE, Alexandre; PRABHAKARAN, Subramaniyan; MORIN, Léo; FAVIER, Véronique; PALIN-LUC, Thierry; BERTHE, Laurent (Elsevier, 2021)A method coupling experiments and simulations, is developed to characterize the yield stress and strain hardening of several metals loaded at 10⁶ s−ⁱ and < 25 ns, typically involved during Laser Shock Peening. It was applied ...
-
Article dans une revue avec comité de lectureThis paper proposes a volumetric high cycle fatigue (HCF) strength criterion able to quantify the influence of natural corrosion pits on the fatigue limit of a martensitic stainless steel with high mechanical strength. ...
-
Article dans une revue avec comité de lectureEL MAY, Mohamed; PALIN-LUC, Thierry; DEVOS, Olivier; BRUCELLE, Olivier; SAINTIER, Nicolas (Elsevier, 2018)This paper presents an analytical model for assessing the corrosion fatigue crack initiation life on a martensitic stainless steel X12CrNiMoV12-3 in high cycle fatigue regime (between 105 and 107 cycles). Based on in-situ ...