MATEC Web Conf.
Volume 300, 2019ICMFF12 - 12th International Conference on Multiaxial Fatigue and Fracture
|Number of page(s)||9|
|Published online||02 December 2019|
The effect of mean axial and torsional stresses on the fatigue strength of 34CrNiMo6 high strength steel
Colegio Gaztelueta, Barrio de Artaza, 87, 48940 Lejona, Spain
2 Departamento de Ingeniería Mecánica, Escuela de Ingeniería de Bilbao, UPV/EHU. Plaza Ingeniero Torres Quevedo, 1, 48013 Bilbao, Spain
3 École Nationale Supérieure d’Arts et Métiers ParisTech à Bordeaux-Talence. Esplanade des Arts et Métiers 33405 TALENCE Cedex, France
The present study consists of a theoretical, experimental and fractographic investigation of the effect of superimposed static axial and shear stresses on the high cycle fatigue behavior of a 34CrNiMo6 high strength steel in quenched and tempered condition (UTS = 1210 MPa), commonly employed in highly stressed mechanical components. The Haigh diagrams for the axial and torsional cases under different values of mean stress were obtained. In both cases, experimental results showed that increasing the mean stress gradually reduces the stress amplitude that the material can withstand without failure. The results of the present tests are compared with the theoretical predictions from Findley, based on the maximum damage critical plane; and the methods of Marin and Froustey, which are energetic based criterions. Froustey’s method shows the best agreement with experimental results for torsional fatigue with mean shear stresses, showing a non-conservative behaviour for the axial fatigue loading case. Macro-analyses and micro-analyses of specimen fracture appearance were conducted in order to obtain the fracture characteristics for different mean shear stress values under torsion fatigue loading.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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