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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2015

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

Karakas O., Tuzun N.

Journal of Achievements in Materials and Manufacturing Engineering

2015

Vol. 73, nr 2

100--105

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.