A New Approach to Prediction of Fatigue Life For 2024-T42 Aluminum Under Variable Amplitude Loading

Abstract

Abstract.A new approach is explored to predict the fatigue life of 2024-T42 aluminum subjected to variable amplitude loading. The predicted fatigue lives are compared with the experimental data and those predicted by Miner's rule, which show that the fatigue lives predicted by the proposed approach agree well with the experimental results and most of the errors are within a factor of 2. The proposed approach gives better prediction than the Miner's rule owing to the fact that it can take into account the loading history. Furthermore, the theoretical results tend to be non-conservative for the decreasing loading and the predicted results underestimate the experimental lives for the increasing loading.

Fatigue life prediction and system development for 6082-T6 aluminum alloy under variable amplitude loading

“…In this study, the approach proposed in the literature [17] was used to calculate the fatigue lives for 6082-T6 metallic material under different loading condition. The experimental data were compared with the fatigue lives predicted by the proposed approach and Miner's rule.…”

“…The approach used to assess the fatigue life of 6082-T6 aluminum alloy under variable amplitude loading is described in literature [17]. The approach is presented based on the nonlinear energy model [16].…”

“…The results showed that for under variable amplitude loading condition, the theoretical results were in very good agreement with experimental data for 2024-T42 aluminum alloy. Guo [17] proposed an approach on the basis of the nonlinear energy model. It can be observed from the comparison that the predicted fatigue lives by the proposed approach were in good agreement with the experimental data for aluminum alloy 2024-T42.…”

“…The purpose of this study is to determine if the approach proposed in the literature [17] is applicable to fatigue life prediction for 6082-T6 aluminum alloy subjected to multi-level variable amplitude loading. In addition, a fatigue life prediction system is developed for engineering application.…”