Fatigue life of the magnesium alloy AZ31B under specific spectrum loading

Abstract The purpose of this study was to investigate the characteristics of magnesium alloy AZ31B and its resilience with regard to fatigue by means of spectrum loading for automotive applications. This is because magnesium is being used extensively in automotive components and indirectly, it is necessary to know the fatigue level of the material to have a clear picture when designing the use of the material. Experiments and simulations were used in this study, which involved the experimental testing of material stress and fatigue. The fatigue test, using hydraulic servo fatigue, was divided into two parts, one using the constant amplitude loading analysis, and the other, spectrum loading, to get the level of resilience of the alloy concerned. The simulations were conducted using fatigue analysis software to obtain the number of fatigue cycles of the material using the Coffin-Manson theory. The spectrum loading data was developed based on the percentage of the yield stress of the AZ31B alloy. The experimental results obtained show that the material properties of magnesium alloy AZ31B are approximately equivalent to the ASTM standard with an error of less than 20 %. The validation experiments and simulations for loading fatigue had almost the same effect, namely in the correlation ratios of 1 : 2 and 2 : 1. From the study, it can be seen that the resilience of AZ31B makes it appropriate for the use in automotive applications.

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