{"paper_id":"02ba607f-919b-47ec-90ea-40ee2f6d22ae","body_text":"Crack Propagation Mechanism and Life Prediction of Liner under Thermal Fatigue Loads | 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 Crack Propagation Mechanism and Life Prediction of Liner under Thermal Fatigue Loads Xinlin WANG, Wu LI, Mingxin Zheng, Qinghua ZENG, Yinhuai Li, Huiping Yang This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-8510252/v1 This work is licensed under a CC BY 4.0 License Status: Published Journal Publication published 13 Mar, 2026 Read the published version in Scientific Reports → Version 1 posted 10 You are reading this latest preprint version Abstract To address the crack propagation issue in thin-walled multi-inclined-hole liners of aero-engine combustion chambers during service, a high-fidelity thermo-fluid-structure interaction (TFSI) numerical methodology was systematically developed in conjunction with experimental validation to elucidate the crack propagation mechanisms and the influence of initial crack parameters on remaining life characteristics. Research findings demonstrate that increases in both initial crack opening angle α₀ and azimuth angle β₀ significantly prolong the remaining life N, with their positive correlation to N strengthening as these parameters increase concurrently. Conversely, augmenting initial crack length L₀ leads to a substantial reduction in N, although the decay rate diminishes with increasing L₀. The angular intervals α₀∈[45°,60°] and β₀∈[15°,30°] are defined as the remaining life enhancement region for crack propagation. Furthermore, an echo state network (ESN)-based surrogate model with superior training efficiency and small-sample handling capability was developed, achieving an average relative error below 5% in predicting liner crack propagation life. This work provides robust theoretical support for condition monitoring and maintenance decision-making in aero-engine liners. Physical sciences/Engineering Physical sciences/Mathematics and computing Aircraft Combustor Crack Propagation Life Prediction Surrogate Model Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Published Journal Publication published 13 Mar, 2026 Read the published version in Scientific Reports → Version 1 posted Editorial decision: Revision requested 15 Feb, 2026 Reviews received at journal 01 Feb, 2026 Reviews received at journal 21 Jan, 2026 Reviewers agreed at journal 15 Jan, 2026 Reviewers agreed at journal 13 Jan, 2026 Reviewers invited by journal 12 Jan, 2026 Editor assigned by journal 12 Jan, 2026 Editor invited by journal 12 Jan, 2026 Submission checks completed at journal 08 Jan, 2026 First submitted to journal 08 Jan, 2026 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. 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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-8510252\",\"acceptedTermsAndConditions\":true,\"allowDirectSubmit\":false,\"archivedVersions\":[],\"articleType\":\"Article\",\"associatedPublications\":[],\"authors\":[{\"id\":574012980,\"identity\":\"0800e224-b0bf-41be-862a-9d043fad5d51\",\"order_by\":0,\"name\":\"Xinlin WANG\",\"email\":\"\",\"orcid\":\"\",\"institution\":\"Tsinghua University\",\"correspondingAuthor\":false,\"prefix\":\"\",\"firstName\":\"Xinlin\",\"middleName\":\"\",\"lastName\":\"WANG\",\"suffix\":\"\"},{\"id\":574012981,\"identity\":\"d355a66e-a4af-4c78-8679-08d3b060c841\",\"order_by\":1,\"name\":\"Wu 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Research findings demonstrate that increases in both initial crack opening angle α₀ and azimuth angle β₀ significantly prolong the remaining life N, with their positive correlation to N strengthening as these parameters increase concurrently. Conversely, augmenting initial crack length L₀ leads to a substantial reduction in N, although the decay rate diminishes with increasing L₀. The angular intervals α₀\\u0026isin;[45\\u0026deg;,60\\u0026deg;] and β₀\\u0026isin;[15\\u0026deg;,30\\u0026deg;] are defined as the remaining life enhancement region for crack propagation. Furthermore, an echo state network (ESN)-based surrogate model with superior training efficiency and small-sample handling capability was developed, achieving an average relative error below 5% in predicting liner crack propagation life. This work provides robust theoretical support for condition monitoring and maintenance decision-making in aero-engine liners.\\u003c/p\\u003e\",\"manuscriptTitle\":\"Crack Propagation Mechanism and Life Prediction of Liner under Thermal Fatigue Loads\",\"msid\":\"\",\"msnumber\":\"\",\"nonDraftVersions\":[{\"code\":1,\"date\":\"2026-01-14 11:56:31\",\"doi\":\"10.21203/rs.3.rs-8510252/v1\",\"editorialEvents\":[{\"type\":\"communityComments\",\"content\":0},{\"type\":\"decision\",\"content\":\"Revision requested\",\"date\":\"2026-02-16T04:37:57+00:00\",\"index\":\"\",\"fulltext\":\"\"},{\"type\":\"editorInvitedReview\",\"content\":\"\",\"date\":\"2026-02-01T17:29:10+00:00\",\"index\":\"hide\",\"fulltext\":\"\"},{\"type\":\"editorInvitedReview\",\"content\":\"\",\"date\":\"2026-01-21T09:28:37+00:00\",\"index\":\"hide\",\"fulltext\":\"\"},{\"type\":\"reviewerAgreed\",\"content\":\"294510000200225178597721297830237095743\",\"date\":\"2026-01-15T07:07:58+00:00\",\"index\":\"hide\",\"fulltext\":\"\"},{\"type\":\"reviewerAgreed\",\"content\":\"316784039662806020039692546355357170490\",\"date\":\"2026-01-13T14:58:51+00:00\",\"index\":\"hide\",\"fulltext\":\"\"},{\"type\":\"reviewersInvited\",\"content\":\"\",\"date\":\"2026-01-13T00:44:32+00:00\",\"index\":\"\",\"fulltext\":\"\"},{\"type\":\"editorAssigned\",\"content\":\"\",\"date\":\"2026-01-13T00:40:19+00:00\",\"index\":\"\",\"fulltext\":\"\"},{\"type\":\"editorInvited\",\"content\":\"\",\"date\":\"2026-01-12T10:29:08+00:00\",\"index\":\"\",\"fulltext\":\"\"},{\"type\":\"checksComplete\",\"content\":\"\",\"date\":\"2026-01-08T11:58:18+00:00\",\"index\":\"\",\"fulltext\":\"\"},{\"type\":\"submitted\",\"content\":\"Scientific Reports\",\"date\":\"2026-01-08T11:48:16+00:00\",\"index\":\"\",\"fulltext\":\"\"}],\"status\":\"published\",\"journal\":{\"display\":true,\"email\":\"info@researchsquare.com\",\"identity\":\"scientific-reports\",\"isNatureJournal\":false,\"hasQc\":true,\"allowDirectSubmit\":false,\"externalIdentity\":\"scirep\",\"sideBox\":\"Learn more about [Scientific Reports](http://www.nature.com/srep/)\",\"snPcode\":\"\",\"submissionUrl\":\"\",\"title\":\"Scientific Reports\",\"twitterHandle\":\"\",\"acdcEnabled\":true,\"dfaEnabled\":true,\"editorialSystem\":\"stoa\",\"reportingPortfolio\":\"Scientific Reports\",\"inReviewEnabled\":true,\"inReviewRevisionsEnabled\":true}}],\"origin\":\"\",\"ownerIdentity\":\"f3dabefb-392c-4580-a75d-27199d8b29be\",\"owner\":[],\"postedDate\":\"January 14th, 2026\",\"published\":true,\"recentEditorialEvents\":[],\"rejectedJournal\":[],\"revision\":\"\",\"amendment\":\"\",\"status\":\"published-in-journal\",\"subjectAreas\":[{\"id\":61078599,\"name\":\"Physical sciences/Engineering\"},{\"id\":61078600,\"name\":\"Physical sciences/Mathematics and computing\"}],\"tags\":[],\"updatedAt\":\"2026-03-16T16:03:07+00:00\",\"versionOfRecord\":{\"articleIdentity\":\"rs-8510252\",\"link\":\"https://doi.org/10.1038/s41598-026-43714-2\",\"journal\":{\"identity\":\"scientific-reports\",\"isVorOnly\":false,\"title\":\"Scientific Reports\"},\"publishedOn\":\"2026-03-13 15:58:54\",\"publishedOnDateReadable\":\"March 13th, 2026\"},\"versionCreatedAt\":\"2026-01-14 11:56:31\",\"video\":\"\",\"vorDoi\":\"10.1038/s41598-026-43714-2\",\"vorDoiUrl\":\"https://doi.org/10.1038/s41598-026-43714-2\",\"workflowStages\":[]},\"version\":\"v1\",\"identity\":\"rs-8510252\",\"journalConfig\":\"researchsquare\"},\"__N_SSP\":true},\"page\":\"/article/[identity]/[[...version]]\",\"query\":{\"redirect\":\"/article/rs-8510252\",\"identity\":\"rs-8510252\",\"version\":[\"v1\"]},\"buildId\":\"XKTyCvWXoU3ODBz1xrDgd\",\"isFallback\":false,\"isExperimentalCompile\":false,\"dynamicIds\":[84888],\"gssp\":true,\"scriptLoader\":[]}","source_license":"CC-BY-4.0","license_restricted":false}