{"title":"Modeling high-cycle and very-high-cycle fatigue in L-PBF AlSi10Mg considering melt pool microstructure heterogeneity","authors":"Mingqi Lei \n (, ), Lu Liu \n (, ), Yao Yao \n (, )","doi":"10.1007/s10409-026-51024-x","DOIUrl":null,"url":null,"abstract":"<div><p>The fatigue performance of additively manufactured (AM) aluminum alloys is strongly dependent on their unique microstructure. This work introduces a crystal plasticity finite element model for AM AlSi10Mg that explicitly incorporates key microstructural features, including melt pool structures, grain orientations, and initial internal defects. After validating the model against uniaxial tensile test data, it was employed to predict both high-cycle and very-high-cycle fatigue life. A comparison of two fatigue indicator parameters showed that the one based on the Fatemi-Socie criterion yielded significantly more accurate life predictions under various stress ratios. Furthermore, an investigation into the effect of internal defect size on fatigue life revealed a negative linear correlation on a logarithmic scale.</p><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":"42 12","pages":""},"PeriodicalIF":4.0000,"publicationDate":"2026-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Acta Mechanica Sinica","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1007/s10409-026-51024-x","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
引用次数: 0
Abstract
The fatigue performance of additively manufactured (AM) aluminum alloys is strongly dependent on their unique microstructure. This work introduces a crystal plasticity finite element model for AM AlSi10Mg that explicitly incorporates key microstructural features, including melt pool structures, grain orientations, and initial internal defects. After validating the model against uniaxial tensile test data, it was employed to predict both high-cycle and very-high-cycle fatigue life. A comparison of two fatigue indicator parameters showed that the one based on the Fatemi-Socie criterion yielded significantly more accurate life predictions under various stress ratios. Furthermore, an investigation into the effect of internal defect size on fatigue life revealed a negative linear correlation on a logarithmic scale.
期刊介绍：
Acta Mechanica Sinica, sponsored by the Chinese Society of Theoretical and Applied Mechanics, promotes scientific exchanges and collaboration among Chinese scientists in China and abroad. It features high quality, original papers in all aspects of mechanics and mechanical sciences.
Not only does the journal explore the classical subdivisions of theoretical and applied mechanics such as solid and fluid mechanics, it also explores recently emerging areas such as biomechanics and nanomechanics. In addition, the journal investigates analytical, computational, and experimental progresses in all areas of mechanics. Lastly, it encourages research in interdisciplinary subjects, serving as a bridge between mechanics and other branches of engineering and the sciences.
In addition to research papers, Acta Mechanica Sinica publishes reviews, notes, experimental techniques, scientific events, and other special topics of interest.
Related subjects » Classical Continuum Physics - Computational Intelligence and Complexity - Mechanics
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