Issue 37

M. Margetin et alii, Frattura ed Integrità Strutturale, 37 (2016) 146-152; DOI: 10.3221/IGF-ESIS.37.20

[14] Karolczuk, A., Kluger, L., Lagoda, T., A correction in the algorithm of fatigue life calculation based on the critical plane approach, Int J Fatigue, 83(2) (2016) 174-183. DOI: 10.1016/j.ijfatigue.2015.10.011 [15] Durka, R., Contribution to fatigue life time evaluation of structures under multiaxial loading, PhD. Thesis, Slovak University of Technology, Slovakia, (2012). [16] Polak, J., Man, J., Vystavel, T., Petranec, M., The shape of extrusions and intrusions and initiation of stage I fatigue cracks, Mater Sci Eng A, 517 (2009) 204-211. DOI: 10.1016/j.msea.2009.03.070

N OMENCLATURE

σ, τ

- normal and shear stress respectively - normal, shear and equivalent stress respectively - normal and shear fatigue strength coeficient respectively - normal and shear fatigue strength exponent

, τ a , τ f’ , b τ

, σ a,eq

σ a σ f’ b σ σ n N f

- normal stress in computed plane

- cycles to failure - yield strength - ultimate strength

σ y02

σ u k i R

- material parameters used to weight normal and shear stress respectively

- correlation coefficient - probability of occurrence

P

152