Issue 47

S. Bressan et alii, Frattura ed Integrità Strutturale, 47 (2019) 126-140; DOI: 10.3221/IGF-ESIS.47.10 140 [47] Morishita, T. and Itoh, T. (2016). Evaluation of multiaxial low cycle fatigue life for Type 316L stainless steel notched specimen under non-proportional loading, Theoretical and Applied Fracture Mechanics, 84, pp. 98-105. DOI:10.1016/j.tafmec.2016.02.007. [48] Suresh, S. (1991). Fatigue of Materials, Cambridge University Press, England. [49] Sines, G., Waisman, J.L. (Eds). (1969). Metal Fatigue, McGraw-Hill, New York. [50] Gallo, P., Bressan, S., Morishita, T., Itoh, T., Berto, F. (2017). Analysis of multiaxial low cycle fatigue of notched specimens for type 316L stainless steel under non-proportional loading, Theoretical and Applied Fracture Mechanics, 89, pp. 79-89. DOI: 10.1016/j.tafmec.2017.01.009. [51] Manson, S.S. (1965). Fatigue – a complex subject – some simple approximations, Experimental Mechanics, 5(7), pp. 193-226. DOI: 10.1007/BF02321056. [52] Muralidharan, U. and Manson, S.S. (1988). A modified universal slopes equation for estimation of fatigue characteristics of metals, Journal of Engineering Materials and Technology, 110(1), pp. 55-58. DOI: 10.1115/1.3226010 [53] Bäumel Jr., A. and Seeger, T. (1990). Materials Data for Cyclic Loading, Elsevier Science Publishers, Amsterdam, (supplement 1). N OMENCLATURE α additional hardening coefficient ε' f fatigue ductility coefficient Δε eq strain range based on von Mises Δε NP non-proportional strain range Δσ eq stress range based on von Mises ε U ultimate tensile strain ρ notch sensitivity factor σ' f fatigue strength coefficient σ U ultimate tensile strength σ Y0.2 yield stress at ε=0.02% A, B Universal Slope Method coefficients E Young’s modulus f NP non-proportional factor K t,n elastic stress concentration factors referred to the net section K f fatigue stress concentration factor K’ t local stress concentration factor K’ f total fatigue stress concentration factor N f number of cycles to failure r notch radius A BBREVIATIONS 6061Al Aluminum Alloy 6061 316LSS Stainless steel AISI 316 L PP Push-pull strain path CI Circle strain path USM Universal slope method M-M Muralidharan-Manson method B-S Bäumel-Seeger method