{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T04:08:38Z","timestamp":1790827718357,"version":"4.1.0"},"reference-count":33,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2024,4,8]],"date-time":"2024-04-08T00:00:00Z","timestamp":1712534400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>A set of polymer composite bolted T-joints with a novel configuration consisting of an internal skeleton and external skin was fabricated using a prepreg-RTM co-curing molding process. Experiments were conducted to study their mechanical properties under a bending load. A finite element model with a polymer resin area between the skin and skeleton was established and verified by the experimental results. Then, the damage propagation process and failure mechanism of the joint and the influence of three factors related to the layer characteristics of the skin and skeleton were investigated by the validated models. The results show that the bending stiffness and the yield limit load of the novel composite T-joint are 0.81 times and 1.65 times that of the 2A12 aluminum T-joint, respectively, while at only 55.4% of its weight. The damage of the joint is initiated within the resin area and leads to the degradation of the joint\u2019s bending performance. The preferred stacking sequence of the skeleton is [0\/+45\/90\/\u221245]ns when primarily subjected to bending loads. The decrease in the bending performance is within 5% of the inclining angle of the skeleton, less than 12 degrees. The more 90\u00b0 layers in the skin, the better the bending performance of the joints, while the more 0\u00b0 layers, the poorer the bending performance.<\/jats:p>","DOI":"10.3390\/polym16071018","type":"journal-article","created":{"date-parts":[[2024,4,8]],"date-time":"2024-04-08T12:01:22Z","timestamp":1712577682000},"page":"1018","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Experimental and Numerical Investigation of Prepreg-RTM Co-Curing Molding Composite Bolted T-Joint under Bending Load"],"prefix":"10.3390","volume":"16","author":[{"given":"Tao","family":"Zhang","sequence":"first","affiliation":[{"name":"School of Materials Science and Engineering, Beihang University, Beijing 100191, China"},{"name":"Research Institute of Aerospace Special Materials and Processing Technology, Beijing 100074, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Zhitao","family":"Luo","sequence":"additional","affiliation":[{"name":"School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kenan","family":"Li","sequence":"additional","affiliation":[{"name":"School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7081-569X","authenticated-orcid":false,"given":"Xiaoquan","family":"Cheng","sequence":"additional","affiliation":[{"name":"School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,4,8]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"139","DOI":"10.13111\/2066-8201.2013.5.3.14","article-title":"Advanced Composite Materials of the Future in Aerospace Industry","volume":"5","year":"2013","journal-title":"Incas Bull."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Rana, S., and Fangueiro, R. (2016). Advanced Composite Materials for Aerospace Engineering, Woodhead Publishing.","DOI":"10.1016\/B978-0-08-100037-3.00001-8"},{"key":"ref_3","unstructured":"McCarthy, M., Stanley, W., and Lawlor, V. (2001). Bolt-Hole Clearance Test Results, Part 1: Static Tests, University of Limerick."},{"key":"ref_4","unstructured":"Peng, Y.Z. (2020). Research on Mechanical Properties of Composite T-Joints. [Master\u2019s Thesis, Nanjing University of Aeronautics and Astronautics]. Available online: https:\/\/d.wanfangdata.com.cn\/thesis\/D02306639."},{"key":"ref_5","first-page":"41","article-title":"Research and Analysis on the Mechanical Properties and Optimization for Composite T-Joint","volume":"4","author":"Li","year":"2015","journal-title":"Compos. Sci. Eng."},{"key":"ref_6","first-page":"29","article-title":"Research on Damage Mechanism and Lateral Bending Strength Characteristic of Sandwich T-Joint","volume":"28","author":"Zhou","year":"2016","journal-title":"J. Nav. Univ. Eng."},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Liu, Y., Li, M.X., Lu, X.F., and Zhu, X.L. (2021). Failure Mechanism and Strength Prediction Model of T-Joint of Composite Sandwich Structure. Metals, 11.","DOI":"10.3390\/met11081197"},{"key":"ref_8","first-page":"128","article-title":"The Failure Experiment of Composite T-Joints with Induced Defects under Bending Load","volume":"37","author":"Wu","year":"2015","journal-title":"J. Natl. Univ. Def. Technol."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"430","DOI":"10.1016\/j.compositesb.2015.05.002","article-title":"An Experimental and Finite Element Study of the Transverse Bending Behaviour of CFRP Composite T-Joints in Vehicle Structures","volume":"79","author":"Koricho","year":"2015","journal-title":"Compos. Part B Eng."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"113374","DOI":"10.1016\/j.compstruct.2020.113374","article-title":"Progressive Damage Analysis of an Adhesively Bonded Composite T-Joint under Bending, Considering Micro-Scale Effects of Fiber Volume Fraction of Adherends","volume":"258","author":"Barzegar","year":"2021","journal-title":"Compos. Struct."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"182","DOI":"10.1016\/j.compositesa.2013.07.015","article-title":"Investigation into Failure of Laminated Composite T-Piece Specimens under Bending Loading","volume":"54","author":"Wisnom","year":"2013","journal-title":"Compos. Part A Appl. Sci. Manuf."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Luo, G., Chai, C.P., Liu, J.Z., Xiao, Y.Z., Chen, Y.S., and Xu, F.X. (2022). Investigations on the Mechanical Properties of Composite T-Joints with Defects under Bending Loading. Sustainability, 14.","DOI":"10.3390\/su142416609"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"73","DOI":"10.1016\/j.compositesb.2015.10.032","article-title":"Strengthening of Composite T-Joints Using Novel Ply Design Approaches","volume":"88","author":"Burns","year":"2016","journal-title":"Compos. Part B Eng."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"59","DOI":"10.1016\/j.compositesb.2015.09.026","article-title":"Design and Investigation of Composite Bolted \u03c0-Joints with an Unconventional Configuration under Bending Load","volume":"85","author":"Cheng","year":"2016","journal-title":"Compos. Part B Eng."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"384","DOI":"10.1007\/s40430-020-02476-2","article-title":"Analysis and Design Improvement of Composite Bolted \u03c0-Joints under Bending Load","volume":"42","author":"Du","year":"2020","journal-title":"J. Braz. Soc. Mech. Sci. Eng."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"324","DOI":"10.1016\/j.compositesb.2015.03.094","article-title":"Experimental and Numerical Investigation of Composite Bolted \u03c0-Joint Subjected to Bending Load","volume":"78","author":"Fan","year":"2015","journal-title":"Compos. Part B Eng."},{"key":"ref_17","first-page":"39","article-title":"RTM Process for Large-Scale and High-Performances Composite Components","volume":"52","author":"Zhao","year":"2020","journal-title":"J. Nanjing Univ. Aeronaut. Astronaut."},{"key":"ref_18","first-page":"57","article-title":"Research of Processing Characteristics and Mechanical Properties of Semi-Prepreg RTM Composites","volume":"34","author":"Li","year":"2014","journal-title":"J. Aeronaut. Mater."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"100276","DOI":"10.1016\/j.jcomc.2022.100276","article-title":"A Review on Manufacturing Defects and Their Detection of Fiber Reinforced Resin Matrix Composites","volume":"8","author":"Fu","year":"2022","journal-title":"Compos. Part C Open Access"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"211","DOI":"10.1016\/S1000-9361(08)60089-8","article-title":"Mechanical Properties of RTM-Made Composite Cross-Joints","volume":"22","author":"Cheng","year":"2009","journal-title":"Chin. J. Aeronaut."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"131","DOI":"10.1016\/0376-0421(95)00004-6","article-title":"Application of Modern Aluminum Alloys to Aircraft","volume":"32","author":"Starke","year":"1996","journal-title":"Prog. Aerosp. Sci."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"600","DOI":"10.1016\/j.cja.2015.01.011","article-title":"Effects of Cerium Salts on Corrosion Behaviors of Si\u2013Zr Hybrid Sol\u2013Gel Coatings","volume":"28","author":"Yu","year":"2015","journal-title":"Chin. J. Aeronaut."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"769","DOI":"10.1007\/s42452-021-04753-8","article-title":"Defects and Uncertainties of Adhesively Bonded Composite Joints","volume":"3","author":"Omairey","year":"2021","journal-title":"SN Appl. Sci."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"109833","DOI":"10.1016\/j.compscitech.2022.109833","article-title":"Plasma Surface Modification Coupled with Thermal and Step-over Distance Effects on Significant Fracture Improvement of Adhesively-Bonded Metal-CFRTP Dissimilar Materials","volume":"232","author":"Qiao","year":"2023","journal-title":"Compos. Sci. Technol."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"1372","DOI":"10.1016\/j.commatsci.2010.05.012","article-title":"The Effect of Imperfect Bonding on the Pull-out Behavior of Non-Crimp Fabric Pi-Shaped Joints","volume":"50","author":"Tserpes","year":"2011","journal-title":"Comput. Mater. Sci."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"329","DOI":"10.1115\/1.3153664","article-title":"Failure Criteria for Unidirectional Fiber Composites","volume":"47","author":"Hashin","year":"1980","journal-title":"J. Appl. Mech."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"1056","DOI":"10.1177\/002199830003401301","article-title":"Progressive Fatigue Damage Modeling of Composite Materials, Part I: Modeling","volume":"34","author":"Shokrieh","year":"2000","journal-title":"J. Compos. Mater."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"1081","DOI":"10.1177\/002199830003401302","article-title":"Progressive Fatigue Damage Modeling of Composite Materials, Part II: Material Characterization and Model Verification","volume":"34","author":"Shokrieh","year":"2000","journal-title":"J. Compos. Mater."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"257","DOI":"10.1016\/0266-3538(88)90043-7","article-title":"Role of Matrix Resin in Delamination Onset and Growth in Composite Laminates","volume":"33","author":"Ye","year":"1988","journal-title":"Compos. Sci. Technol."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"329","DOI":"10.1016\/S0263-8223(98)80014-7","article-title":"Optimum Bolted Joints for Hybrid Composite Materials","volume":"38","author":"Oh","year":"1997","journal-title":"Compos. Struct."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"287","DOI":"10.1016\/0263-8223(94)00041-7","article-title":"Three-Dimensional Contact Stress Analysis of a Composite Laminate with Bolted Joint","volume":"30","author":"Chen","year":"1995","journal-title":"Compos. Struct."},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"834","DOI":"10.1177\/002199838702100904","article-title":"A Progressive Damage Model for Laminated Composites Containing Stress Concentrations","volume":"21","author":"Chang","year":"1987","journal-title":"J. Compos. Mater."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"556","DOI":"10.1177\/002199839102500505","article-title":"A Progressive Failure Model for Composite Laminates Containing Openings","volume":"25","author":"Tan","year":"1991","journal-title":"J. Compos. 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