Optimization of free form surface in bulge formed joint based on isogeometric analysis

Optimization of free form surface in bulge formed joint based on isogeometric analysis | 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 Research Article Optimization of free form surface in bulge formed joint based on isogeometric analysis Sen Luo, Yuantao Sun, Jinjin Zhai, Qing Zhang, Xiaoqing Chang This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-5158985/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 13 Dec, 2024 Read the published version in Iranian Journal of Science and Technology, Transactions of Mechanical Engineering → Version 1 posted 9 You are reading this latest preprint version Abstract The bulge formed joint is a novel free-form surface thin-wall joint structure used in truss structure systems, and its shape characteristics strongly influence the bearing capacity of the structure. The isogeometric analysis method provides a new way to analyze and optimize these free-form surface structures. To enhance the aesthetic appearance such as smoothness of the form and increase the bearing capacity of the structures, an optimal design method of bulge formed joint based on isogeometric analysis is proposed in this paper. This paper proposes a joint shape evaluation index based on NURBS surface characteristics. It establishes an optimization model for shell surface shape within the isogeometric analysis framework, derives an analytical expression for the sensitivity of design variables, and employs h -refinement to propagate sensitivity across multiple mesh models. The optimization design of joint configuration is realized by combining the moving asymptote method. The optimization results of the T-type and K-type bulge formed joint show that the mechanical properties and morphological smoothness of the free-form surface joint are improved. bulge formed joint NURBS isogeometric analysis shape optimization sensitivity propagation Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 13 Dec, 2024 Read the published version in Iranian Journal of Science and Technology, Transactions of Mechanical Engineering → Version 1 posted Editorial decision: Revision requested 03 Nov, 2024 Reviews received at journal 02 Nov, 2024 Reviews received at journal 26 Oct, 2024 Reviewers agreed at journal 29 Sep, 2024 Reviewers agreed at journal 28 Sep, 2024 Reviewers invited by journal 27 Sep, 2024 Editor assigned by journal 26 Sep, 2024 Submission checks completed at journal 26 Sep, 2024 First submitted to journal 26 Sep, 2024 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-5158985","acceptedTermsAndConditions":true,"allowDirectSubmit":false,"archivedVersions":[],"articleType":"Research Article","associatedPublications":[],"authors":[{"id":373415344,"identity":"8c64a3e0-c030-44f9-8af8-b3f66f2eb8d9","order_by":0,"name":"Sen Luo","email":"","orcid":"","institution":"School of Mechanical Engineering, Tongji University,Shanghai","correspondingAuthor":false,"prefix":"","firstName":"Sen","middleName":"","lastName":"Luo","suffix":""},{"id":373415345,"identity":"c932fa06-4a90-4e54-a4d0-374cf79b5e54","order_by":1,"name":"Yuantao 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The isogeometric analysis method provides a new way to analyze and optimize these free-form surface structures. To enhance the aesthetic appearance such as smoothness of the form and increase the bearing capacity of the structures, an optimal design method of bulge formed joint based on isogeometric analysis is proposed in this paper. This paper proposes a joint shape evaluation index based on NURBS surface characteristics. It establishes an optimization model for shell surface shape within the isogeometric analysis framework, derives an analytical expression for the sensitivity of design variables, and employs \u003cem\u003eh\u003c/em\u003e-refinement to propagate sensitivity across multiple mesh models. The optimization design of joint configuration is realized by combining the moving asymptote method. 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