A Fatigue Damage Accumulation Model Considering Load Interaction and Material Parameters Under Variable Load Conditions

This project gives research guidance and hands‑on help for evaluating a non‑linear fatigue‑damage model that’s meant for metallic aerospace structures under variable‑amplitude loading. Conventional linear rules, like Miner’s hypothesis, ignore the order of loads and material‑specific factors, so they often give unsafe life estimates. To fix these problems, the study sets up an advanced fatigue model that includes: – an exponential function of cycle life, – the material’s elastic modulus, and – a specific load‑interaction factor. With this approach you can compute the remaining fatigue life when a part experiences several different loading levels. The model is checked by running numerical simulations on smooth and notched specimens made from various

engineering metals. The simulations cover both high‑to‑low and low‑to‑high loading sequences. Results are compared with experimental data from the literature, with predictions from Miner’s rule, and with Aeran’s model. The comparison shows that the new model predicts fatigue life more accurately and is more robust. Overall, the project provides an academic resource for: – setting up fatigue‑life assessments, – studying how damage spreads, and – performing parametric sensitivity studies on load‑interaction parameters in aerospace structural components.

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