{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,21]],"date-time":"2026-08-21T10:52:28Z","timestamp":1787309548683,"version":"build-2736575974"},"reference-count":23,"publisher":"MDPI AG","issue":"19","license":[{"start":{"date-parts":[[2025,9,23]],"date-time":"2025-09-23T00:00:00Z","timestamp":1758585600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100012166","name":"National Key R D Program of China","doi-asserted-by":"publisher","award":["2022YFB3402200"],"award-info":[{"award-number":["2022YFB3402200"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100012166","name":"National Key R D Program of China","doi-asserted-by":"publisher","award":["12472121"],"award-info":[{"award-number":["12472121"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100012166","name":"National Key R D Program of China","doi-asserted-by":"publisher","award":["92471104"],"award-info":[{"award-number":["92471104"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100012166","name":"National Key R D Program of China","doi-asserted-by":"publisher","award":["12102351"],"award-info":[{"award-number":["12102351"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["2022YFB3402200"],"award-info":[{"award-number":["2022YFB3402200"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["12472121"],"award-info":[{"award-number":["12472121"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["92471104"],"award-info":[{"award-number":["92471104"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["12102351"],"award-info":[{"award-number":["12102351"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>Focusing on the practical application requirements of adhesive-bonded structures in aerospace engineering, this study aims to investigate the mechanical performance and failure mechanisms of adhesive interfaces. Adhesive bonding, valued for its uniform load distribution, low stress concentration, superior sealing, and lightweight properties, serves as a critical joining technology in aerospace engineering. However, its reliable application is constrained by complex multimode failure issues, such as cohesive failure, interfacial debonding, and matrix damage. To address these challenges, a comprehensive evaluation of the novel high-strength epoxy adhesive Dq622JD-136 (Adhesive III) was conducted through systematic tests, including bulk tension, butt joint tension, single lap shear, compressive shear, and fracture toughness (TDCB\/ENF) tests. These tests characterized its mechanical properties and fracture behavior under mode-I and mode-II loading, with comparative analyses against conventional adhesives HYJ-16 (Adhesive I) and HYJ-29 (Adhesive II). Key findings reveal that Adhesive III exhibits outstanding elastic modulus, significantly outperforming the comparative adhesives. While its normal and shear strengths are slightly lower than Adhesive I, they surpass Adhesive II. A common characteristic across all adhesives is that normal strength exceeds shear strength. In terms of fracture toughness, Adhesive III demonstrates superior mode-II toughness but relatively lower mode-I toughness. These results elucidate the brittle characteristics of such adhesives, mixed failure modes under normal loading, and cohesive failure behavior under shear loading. The innovation of this work lies in systematically correlating the macroscopic performance of adhesives with failure mechanisms through multi-dimensional testing. Its findings provide critical technical support for multiscale performance evaluation and adhesive selection in aerospace joints subjected to extreme thermomechanical loads.<\/jats:p>","DOI":"10.3390\/ma18194445","type":"journal-article","created":{"date-parts":[[2025,9,23]],"date-time":"2025-09-23T13:48:37Z","timestamp":1758635317000},"page":"4445","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Mechanical Performance and Failure Modes of High-Strength Adhesives in Aluminum Adherend Joints for Aerospace Applications"],"prefix":"10.3390","volume":"18","author":[{"given":"Baojiang","family":"Hou","sequence":"first","affiliation":[{"name":"School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lifeng","family":"Jia","sequence":"additional","affiliation":[{"name":"State IJR Center of Aerospace Design and Additive Manufacturing, School of Mechanical Engineering, Northwestern Polytechnical University, Xi\u2019an 710072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-8234-0450","authenticated-orcid":false,"given":"Lisheng","family":"Zhang","sequence":"additional","affiliation":[{"name":"State IJR Center of Aerospace Design and Additive Manufacturing, School of Mechanical Engineering, Northwestern Polytechnical University, Xi\u2019an 710072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4366-5219","authenticated-orcid":false,"given":"Bo","family":"Xu","sequence":"additional","affiliation":[{"name":"State IJR Center of Aerospace Design and Additive Manufacturing, School of Mechanical Engineering, Northwestern Polytechnical University, Xi\u2019an 710072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jie","family":"Hou","sequence":"additional","affiliation":[{"name":"State IJR Center of Aerospace Design and Additive Manufacturing, School of Mechanical Engineering, Northwestern Polytechnical University, Xi\u2019an 710072, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2025,9,23]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"402","DOI":"10.1080\/00218464.2015.1040155","article-title":"Review of the Adhesively Bonded Interface in a Solid Rocket Motor","volume":"92","author":"Zhou","year":"2015","journal-title":"J. Adhes."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"66","DOI":"10.1016\/j.ijsolstr.2018.08.028","article-title":"Toughening strategies in adhesive joints","volume":"158","author":"Maloney","year":"2019","journal-title":"Int. J. Solids Struct."},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"427","DOI":"10.1016\/j.ijadhadh.2004.11.009","article-title":"Modeling of long-term creep behavior of structural epoxy adhesives","volume":"25","author":"Feng","year":"2005","journal-title":"Int. J. Adhes. Adhes."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"64","DOI":"10.1016\/j.oceaneng.2015.12.044","article-title":"Mechanical behavior of polyurethane adhesive joints used in laminated materials for marine structures","volume":"113","author":"Alia","year":"2016","journal-title":"Ocean Eng."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"71","DOI":"10.1016\/j.compositesb.2018.06.009","article-title":"Multi-material adhesive joints for automotive industry","volume":"151","author":"Banea","year":"2018","journal-title":"Compos. Part B Eng."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"113539","DOI":"10.1016\/j.compstruct.2020.113539","article-title":"Qualitative analysis of the influence of the non-linear material characteristics of flexible adhesive on the performance of lap joints","volume":"260","author":"Nowak","year":"2021","journal-title":"Compos. Struct."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1163","DOI":"10.1016\/S0020-7683(97)00097-8","article-title":"Improved theoretical solutions for adhesive lap joints","volume":"35","author":"Tsai","year":"1998","journal-title":"Int. J. Solids Struct."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"2758","DOI":"10.1557\/JMR.2000.0395","article-title":"Plasticity contributions to interface adhesion in thin-film interconnect structures","volume":"15","author":"Lane","year":"2000","journal-title":"J. Mater. Res."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"80","DOI":"10.1016\/j.ijadhadh.2011.12.004","article-title":"Strength and interface failure mechanism of adhesive joints","volume":"34","author":"Xu","year":"2012","journal-title":"Int. J. Adhes. Adhes."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"135","DOI":"10.1016\/j.compstruct.2008.03.026","article-title":"A parametric study on the failure of bonded single-lap joints of carbon composite and aluminum","volume":"86","author":"Seong","year":"2008","journal-title":"Compos. Struct."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"574","DOI":"10.1016\/j.ijadhadh.2010.05.006","article-title":"Adhesive joint strength of hybrid assemblies: Titanium sheet-composites and aluminium sheet-composites\u2014Experimental and numerical verification","volume":"30","author":"Rudawska","year":"2010","journal-title":"Int. J. Adhes. Adhes."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"1180","DOI":"10.1016\/j.matpr.2020.02.074","article-title":"Investigation of adhesively bonded multi-material joints: An assessment on joint efficiency and fracture morphology","volume":"27","author":"Hiremath","year":"2020","journal-title":"Mater. Today Proc."},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Golewski, P. (2022). Tensile Behaviour of Double- and Triple-Adhesive Single Lap Joints Made with Spot Epoxy and Double-Sided Adhesive Tape. Materials, 15.","DOI":"10.3390\/ma15217855"},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Morello, D., Leone, C., Lamanna, G., and Silvio, G. (2025). A two-step full laser surface treatment to improve the adhesive bonding of aluminium-aluminium joints. Int. J. Adhes. Adhes., 142.","DOI":"10.1016\/j.ijadhadh.2025.104089"},{"key":"ref_15","unstructured":"(1972). Standard Test Method for Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Tension Loading (Metal-to-Metal) (Standard No. ASTM D1002)."},{"key":"ref_16","unstructured":"(2008). Standard Test Method for Strength Properties of Adhesive Bonds in Shear by Compression Loading (Standard No. ASTM D905)."},{"key":"ref_17","unstructured":"(1999). Standard Test Method for Fracture Strength in Cleavage of Adhesives in Bonded Metal Joints (Standard No. ASTM D3433)."},{"key":"ref_18","unstructured":"(2022). Standard Test Method for Tensile Properties of Plastics (Standard No. ASTM D638)."},{"key":"ref_19","unstructured":"(1995). Standard Test Method for Tensile Properties of Adhesive Bonds (Standard No. ASTM D897)."},{"key":"ref_20","unstructured":"(2019). Standard Test Method for Determination of the Mode II Interlaminar Fracture Toughness of Unidirectional Fiber-Reinforced Polymer-Matrix Composites (Standard No. ASTM D7905)."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"2389","DOI":"10.1080\/01694243.2020.1763540","article-title":"Experimental study of the CTBN effect on mechanical properties and mode I and II fracture toughness of a new epoxy resin","volume":"34","author":"Dadian","year":"2020","journal-title":"J. Adhes. Sci. Technol."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"1252","DOI":"10.1016\/j.promfg.2020.01.217","article-title":"Fracture envelope estimation of a structural adhesive by dedicated fracture tests","volume":"38","author":"Nunes","year":"2019","journal-title":"Procedia Manuf."},{"key":"ref_23","unstructured":"(2019). Standard Practice for Classifying Failure Modes in Fiber-Reinforced-Plastic (FRP) Joints (Standard No. ASTM D5573)."}],"container-title":["Materials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1996-1944\/18\/19\/4445\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,9]],"date-time":"2025-10-09T18:47:59Z","timestamp":1760035679000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1996-1944\/18\/19\/4445"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2025,9,23]]},"references-count":23,"journal-issue":{"issue":"19","published-online":{"date-parts":[[2025,10]]}},"alternative-id":["ma18194445"],"URL":"https:\/\/doi.org\/10.3390\/ma18194445","relation":{},"ISSN":["1996-1944"],"issn-type":[{"value":"1996-1944","type":"electronic"}],"subject":[],"published":{"date-parts":[[2025,9,23]]}}}