Tunable Poisson’s ratio design in beetle-inspired honeycomb cores: in-plane compression mechanisms and dual-mode deformation

Tunable Poisson’s ratio design in beetle-inspired honeycomb cores: in-plane compression mechanisms and dual-mode deformation | 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 Tunable Poisson’s ratio design in beetle-inspired honeycomb cores: in-plane compression mechanisms and dual-mode deformation Yiheng Song This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8185802/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract The beetle elytron has been identified as a natural sandwich structure whose core topology can be abstracted as a combination of honeycomb cells and trabeculae. Inspired by this biological architecture, the corresponding inspired structure is referred to as the beetle elytron plate (BEP). In this work, three types of cores—End-trabecular BEP (EBEP), Mid-trabecular BEP (MBEP), and the conventional honeycomb plate (HP)—were constructed based on the presence and location of trabeculae. Two cell geometries (regular and concave) and two global orientations (transverse and longitudinal) were also considered. A systematic study was conducted to investigate their load-bearing characteristics, deformation patterns, and Poisson’s-ratio evolution under in-plane compression. The results indicate that (1) MBEP exhibits the best overall performance for both cell geometries, outperforming EBEP and conventional HP in load-bearing capacity, deformation stability, and consistency of Poisson’s ratio; (2) regular configurations exhibit positive Poisson’s ratios, whereas concave configurations show negative Poisson’s ratios, and MBEP undergoes the most pronounced lateral deformation, highlighting the dominant role of trabecula placement in governing cell-wall compliance and transverse deformation modes; (3) a significant coupling exists between trabecula placement and loading direction, such that MBEP demonstrates higher stability under transverse compression, while EBEP shows stronger shape-recovery capability under longitudinal compression, indicating that the structural response is highly sensitive to global orientation. This study reveals the coupled regulatory mechanisms among trabecula placement, cell geometry, and layout direction, providing insights for the development of bio-inspired lightweight structures and mechanical metamaterials with tunable Poisson’s ratios, high stability, and enhanced load-bearing performance. Materials Engineering Mechanical Engineering bio-inspiration beetle elytron Poisson’s ratio in-plane compression Full Text Additional Declarations The authors declare no competing interests. Cite Share Download PDF Status: Posted Version 1 posted 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. We do this by developing innovative software and high quality services for the global research community. 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deformation\u003c/p\u003e","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":true,"hideJournal":true,"highlight":"","institution":"University of Tokyo","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"bio-inspiration, beetle elytron, Poisson’s ratio, in-plane 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Inspired by this biological architecture, the corresponding inspired structure is referred to as the beetle elytron plate (BEP). In this work, three types of cores\u0026mdash;End-trabecular BEP (EBEP), Mid-trabecular BEP (MBEP), and the conventional honeycomb plate (HP)\u0026mdash;were constructed based on the presence and location of trabeculae. Two cell geometries (regular and concave) and two global orientations (transverse and longitudinal) were also considered. A systematic study was conducted to investigate their load-bearing characteristics, deformation patterns, and Poisson\u0026rsquo;s-ratio evolution under in-plane compression. The results indicate that (1) MBEP exhibits the best overall performance for both cell geometries, outperforming EBEP and conventional HP in load-bearing capacity, deformation stability, and consistency of Poisson\u0026rsquo;s ratio; (2) regular configurations exhibit positive Poisson\u0026rsquo;s ratios, whereas concave configurations show negative Poisson\u0026rsquo;s ratios, and MBEP undergoes the most pronounced lateral deformation, highlighting the dominant role of trabecula placement in governing cell-wall compliance and transverse deformation modes; (3) a significant coupling exists between trabecula placement and loading direction, such that MBEP demonstrates higher stability under transverse compression, while EBEP shows stronger shape-recovery capability under longitudinal compression, indicating that the structural response is highly sensitive to global orientation. 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