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A modified damaged stress model for fatigue life prediction based on load interaction.
Lu Zhang1,2,3, Hongli Liu1,2,3, Wei Zhou1,2,3
1Research Institute of Highway Ministry of Transport, 100088, Beijing, China.
Heliyon
|December 10, 2024
Summary
This study introduces a modified Damage Stress Model (DSM) for improved fatigue life prediction. The new model, incorporating Generalized Ultimate Stress (GUS), offers more accurate predictions under multi-stage stress conditions.
Area of Science:
- Materials Science
- Mechanical Engineering
- Fatigue Analysis
Background:
- Fatigue life prediction is crucial for structural integrity.
- Existing models like Miner and DSM have limitations in predicting fatigue under multi-stage stress due to stress variability.
Purpose of the Study:
- To propose a modified Damage Stress Model (DSM) for enhanced fatigue life prediction.
- To address the variability of ultimate stress during damage transfer in multi-stage loading scenarios.
Main Methods:
- Development of a modified Damage Stress Model (DSM) incorporating Generalized Ultimate Stress (GUS).
- GUS is influenced by ultimate stress, cumulative fatigue damage, and adjacent stress ratios.
- Comparative analysis with Miner, original DSM, and Manson models using experimental data from diverse materials and loading stages.
Main Results:
- The proposed modified DSM demonstrates superior performance compared to existing models.
- The model accurately predicts fatigue life by accounting for stress variability and damage accumulation.
- Limitations of the original DSM in handling multi-stage stress are rectified.
Conclusions:
- The modified Damage Stress Model (DSM) with Generalized Ultimate Stress (GUS) provides more accurate fatigue life predictions.
- This enhanced model is valuable for engineering applications involving complex loading histories.
- The study contributes to advancing fatigue analysis methodologies.
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