Evaluation of fatigue behaviour of magnesium welded joints using energy methods according to Neuber’s method

• Autorzy: Karakas O. , Tuzun N.
• Języki publikacji: EN

Abstrakty

EN

Purpose: When engineering designs that are subjected to cyclic loads are concerned, determining the fatigue behaviour of the components is very important. Thus methods that can evaluate the fatigue behaviour accurately are required. Welded joints that are widely used in engineering constructions are often subjected to cyclic loads and require a method that considers weld geometry and notch effect of the weld toe. Due to their high specific strength and low density, magnesium and its alloys became even more prominent in recent years, allow light and durable designs. Thus evaluating the fatigue behaviour of magnesium alloys for fields of application where weights of designs are a prominent factor is especially important. Therefore researching the fatigue behaviour of welded joints of the magnesium alloys is equally important. Design/methodology/approach: In this study, conservative Neuber method that is the basis for energy methods is used to evaluate the fatigue behaviour of the magnesium welded joints. Calculations for different weld-like specimen and different stress ratios have been carried out using Neuber method. Findings: In this study applicability of Neuber’s method to evaluate the fatigue behaviour of magnesium welded joints is researched. According to the findings of this study Neuber’s method which is a basis for energy based methods are feasible to use for fatigue evaluation of magnesium welded joints. Research limitations/implications: Although Nueber’s method serves as a foundation for energy based methods, it is known to be conservative in its calculations. This research can be expanded by the usage of state of the art energy methods and more accurate findings can be acquired. Originality/value: Fatigue behaviour of magnesium welded joints have not been evaluated using energy methods before. This novel approach can improve designs against fatigue.

Słowa kluczowe

EN

properties; fatigue; magnesium; energy methods; welded joints

PL

właściwości; zmęczenie; magnez; metody energetyczne; połączenia spawane

• Wydawca: International OCSCO World Press
• Czasopismo: Journal of Achievements in Materials and Manufacturing Engineering
• Rocznik: 2015
• Tom: Vol. 73, nr 2
• Strony: 100--105
• Opis fizyczny: Bibliogr. 7 poz., rys., tab.

Twórcy

autor

Karakas O.

• Mechanical Engineering Department, Engineering Faculty, Pamukkale University, 20070 Kinikli, Denizli, Turkey

autor

Tuzun N.

• Mechanical Engineering Department, Engineering Faculty, Pamukkale University, 20070 Kinikli, Denizli, Turkey

Bibliografia

• [1] P. Heuler, T. Seeger, Generalized application of Neuber's rule, Journal of Testing and Evaluation 8/4 (1980) 199-204.
• [2] R. Desmorat, Fast estimation of localized plasticity and damage by energetic methods, International Journal of Solids and Structures 39/12 (2002) 3289-3310.
• [3] L. Jianhui, A new method for calculating notch tip stresses and strains based on neuber method and ESED method under multiaxial loading, Jordan Journal of Mechanical and Industrial Engineering 8/1 (2014) 21-26.
• [4] H. Neuber, Theory of stress concentration for shear-strained prismatical bodies with arbitrary nonlinear stress-strain law, Journal of Applied Mechanics 28/4 (1961) 544-550.
• [5] K. Molski, G. Glinka, A method of elastic-plastic stress and strain calculation at a notch root, Materials Science and Engineering 50/1 (1981) 93-100.
• [6] O. Karakas, Application of the notch stress conceptin the fatigue strength evaluation of welded structures from wrought magnesium alloys, Diss., Pamukkale University, 2007 (in Turkish).
• [7] O. Karakas, Consideration of mean-stress effects on fatigue life of welded magnesium joints by the application of the Smith-Watson-Topper and reference radius concepts, International Journal of Fatigue 49 (2013) 1-17.