Abstract
In the present paper, the multiaxial fatigue lifetime of structural components failing in the high-cycle fatigue regime is evaluated by employing the modified Carpinteri-Spagnoli (C-S) multiaxial fatigue criterion based on the critical plane approach. In the above criterion, the critical plane position is linked to averaged principal stress directions through an off-angle 8. Then, the fatigue damage parameter used is determined by a nonlinear combination of an equivalent normal stress amplitude and the shear stress amplitude acting on the critical plane. In the present paper, some modifications of the original expression for the off-angle 8 are implemented in the modified Carpinteri-Spagnoli criterion. In particular, modified expressions recently proposed by Lagoda et al. are in accordance with the assumption originally developed by Carpinteri and co-workers, that is, the off-angle is a function of the ratio between the fatigue limit under fully reversed shear stress and that under fully reversed normal stress. Such expressions can be employed for metals ranging from mild to very hard fatigue behaviour. Some experimental data available in the literature are compared with the theoretical estimations and, only for materials with hard and very hard fatigue behaviour, the modified 8 relationships are shown to yield fatigue lifetime results slightly better than those determined through the original 8 expression.
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Abbreviations
- C :
-
shear stress vector acting on the critical plane
- C(t):
-
modulus of the shear stress vector C
- C a :
-
shear stress amplitude
- m :
-
slope of the S-N curve for fully reversed normal stress (R = -1)
- m * :
-
slope of the S-N curve for fully reversed shear stress (R = -1)
- N :
-
normal stress vector perpendicular to the critical plane
- N(t):
-
modulus of the normal stress vector N
- N ʹa, eq :
-
equivalent normal stress amplitude
- t :
-
time
- S w :
-
stress vector at material point P and related to the critical plane
- w :
-
normal unit vector perpendicular to the critical plane
- δ:
-
angle between the averaged direction î of the maximum principal stress and the normal w to the critical plane (Fig. 1)
- σaf,-1 :
-
fully reversed normal stress fatigue limit
- σu :
-
material ultimate tensile strength
- τaf,-1 :
-
fully reversed shear stress fatigue limit.
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Original Text © A. Carpinteri, C. Ronchei, D. Scorza, S. Vantadori, 2015, published in Fizicheskaya Mezomekhanika, 2015, Vol. 18, No. 5, pp. 74-79.
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Carpinteri, A., Ronchei, C., Scorza, D. et al. Critical Plane Orientation Influence on Multiaxial High-Cycle Fatigue Assessment. Phys Mesomech 18, 348–354 (2015). https://doi.org/10.1134/S1029959915040074
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DOI: https://doi.org/10.1134/S1029959915040074