An Acceleration-Only Modal Circle-Fitting Method for In-Situ Fatigue Damage Detection

An Acceleration-Only Modal Circle-Fitting Method for In-Situ Fatigue Damage Detection | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article An Acceleration-Only Modal Circle-Fitting Method for In-Situ Fatigue Damage Detection Da Som Kang, Seung-Hoon Bae, Seunghun Baek This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-7589975/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 28 Nov, 2025 Read the published version in Scientific Reports → Version 1 posted 11 You are reading this latest preprint version Abstract This study proposes a novel modal circle-fitting method to estimate natural frequency and damping ratio from output-only acceleration. Validated through vibration-fatigue testing on an aerospace bracket, the method successfully detects initial, non-visible fatigue damage through key indicators: a decrease in natural frequency under random vibration and the emergence of a 'split-peak' pattern under sinusoidal excitation. Physical sciences/Engineering Physical sciences/Physics Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 28 Nov, 2025 Read the published version in Scientific Reports → Version 1 posted Editorial decision: Revision requested 12 Oct, 2025 Reviews received at journal 10 Oct, 2025 Reviews received at journal 09 Oct, 2025 Reviewers agreed at journal 30 Sep, 2025 Reviewers agreed at journal 29 Sep, 2025 Reviewers agreed at journal 25 Sep, 2025 Reviewers invited by journal 24 Sep, 2025 Editor invited by journal 17 Sep, 2025 Editor assigned by journal 15 Sep, 2025 Submission checks completed at journal 12 Sep, 2025 First submitted to journal 11 Sep, 2025 You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-7589975","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":524901685,"identity":"c54a25a3-3412-4034-95db-6f6cd7f2da55","order_by":0,"name":"Da Som Kang","email":"","orcid":"","institution":"Hanwha Aerospace, Aero Business Group","correspondingAuthor":false,"prefix":"","firstName":"Da","middleName":"Som","lastName":"Kang","suffix":""},{"id":524901686,"identity":"91b085df-2274-40b8-b14f-26130556ad10","order_by":1,"name":"Seung-Hoon Bae","email":"","orcid":"","institution":"Korea Institute of Machinery and 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