{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T18:58:04Z","timestamp":1785524284498,"version":"3.56.0"},"reference-count":33,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2025,1,15]],"date-time":"2025-01-15T00:00:00Z","timestamp":1736899200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Natural Science Foundation of China","award":["12471536"],"award-info":[{"award-number":["12471536"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>The hygrothermal aging model, based on Fick\u2019s second law of diffusion, characterizes the degradation of engineering constants in T700 carbon fiber\/epoxy resin composites. It focuses on changes in the tensile modulus, shear modulus, and transverse Poisson\u2019s ratio due to moisture absorption and temperature variations. The model validates through mass change observations before and after seawater immersion, along with surface morphology assessments and tensile experiments. The results reveal that the saturated moisture absorption rate for single-layer laminates in seawater immersion is 0.35%. Short-term seawater immersion at room temperature (\u226460 days) does not induce cracks or defects (\u226510 \u03bcm) on the composite\u2019s surface. The composite\u2019s modulus decreases as moisture absorption increases, with the longitudinal tensile modulus dropping by an order of 10\u22125%, while the other engineering constants decrease by an order of 10\u22123%. The modulus also decreases with rising temperature; the closer the temperature is to the matrix\u2019s glass transition, the faster the modulus declines, with the longitudinal tensile modulus decreasing by 0.84%, and the other engineering constants decreasing by 100%. This research provides valuable insights for the engineering applications of composite materials in marine environments.<\/jats:p>","DOI":"10.3390\/ma18020369","type":"journal-article","created":{"date-parts":[[2025,1,15]],"date-time":"2025-01-15T04:42:08Z","timestamp":1736916128000},"page":"369","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["T700 Carbon Fiber\/Epoxy Resin Composite Material Hygrothermal Aging Model"],"prefix":"10.3390","volume":"18","author":[{"given":"Jinjie","family":"Lu","sequence":"first","affiliation":[{"name":"Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Hangzhou 310007, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8904-0943","authenticated-orcid":false,"given":"Chuanxiang","family":"Zheng","sequence":"additional","affiliation":[{"name":"Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Hangzhou 310007, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Liang","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Engineering Mechanics, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuchen","family":"Dai","sequence":"additional","affiliation":[{"name":"Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Hangzhou 310007, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhenyu","family":"Wang","sequence":"additional","affiliation":[{"name":"Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Hangzhou 310007, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhaobo","family":"Song","sequence":"additional","affiliation":[{"name":"Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Hangzhou 310007, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,1,15]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Gibson, R.F. 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