Articles of The Transactions of KSRC

Full text article ( in russian)

Year	2019
Issue	20192
Volume	2
Pages	132–142
Caption	Different approaches to consideration of stressed-state three-axiality in fatigue strength calculations
Authors	Filatov A.R.
Keywords	fatigue strength, lifetime, service life, complex stressed state, non-proportional loading.
DOI	10.24937/2542-2324-2019-2-S-I-132–142
Summary	This paper discusses the methods of reducing complex stressed state to the simple one in fatigue strength calculations. It identifies five main methods: method of absolute maximum principal stresses, method of signed von Mises stresses, Sines and Crossland methods, method of signed shear stresses and method of critical plane. This paper analyses the problem of sign determination for equivalent and tangential stresses, giving recommendations on how to select it. The study also yielded the stresses calculated as per above-mentioned methods for planar stressed state and for proportional loading. The paper also suggests sign modification for Sines method and the value of hydrostatic stress sensitivity coefficient. The case study (a tubular joint) demonstrates the effect of loading non-proportionality upon fatigue damage estimates obtained as per above mentioned method, comparing these results versus those obtained as per critical-plane method. Finally, the paper gives recommendations on optimal application of these methods for both proportional and nonproportional loading