Composites Part C Open Access最新文献

{"title":"Repairing high-strength concrete two-way solid slabs exposed to elevated temperature using NSM-CFRP ropes","authors":"Ahmed Ashteyat ,&nbsp;Mousa Shhabat ,&nbsp;Ibrahim Al-Hazmi","doi":"10.1016/j.jcomc.2025.100590","DOIUrl":"10.1016/j.jcomc.2025.100590","url":null,"abstract":"<div><div>Exposure of reinforced concrete (RC) structures to elevated temperatures results in significant degradation of their mechanical properties and overall structural integrity, necessitating the development of effective repair strategies to restore their load-bearing capacity and long-term durability. This study introduces a novel approach through both experimental and theoretical investigations into the efficacy of using Near-Surface Mounted (NSM) Carbon Fiber Reinforced Polymer (CFRP) ropes to repair two-way high-strength concrete (HSC) solid slabs subjected to elevated temperatures of 600 °C for a duration of 3 h. A total of eight slabs, each measuring 1050 × 1050 × 70 mm, were tested, comprising two normal-strength concrete (NSC) slabs and six HSC slabs. The study examined three primary variables: the number of CFRP ropes (2 or 3), their orientation angles (0° or 45°), and their configuration patterns (radial star or concentric squares). The key performance indicators evaluated included load capacity, failure modes, stiffness, and ductility. The experimental results indicated that the NSM-CFRP rope repairing technique significantly enhanced the structural performance of heat-damaged slabs. Load capacity improved by 12 % to 35 %, stiffness by 260 % to 343 %, and ductility by 127 % to 324 % when compared to unstrengthened slabs. Notably, the configurations of one rope in a radial star pattern around the column (R-SR) and three ropes arranged in concentric squares at a 45° angle (3R-CS 45°) demonstrated the highest recovery efficiencies, restoring the pre-fire load capacity by 10 % and 1 %, respectively. Theoretical analysis revealed that the models by El-Gamal et al. and Ospina et al. provided close alignment with the experimental findings, with average experimental-to-theoretical ratios of 1.09 and 1.12, respectively. In contrast, the ACI 440.2R-22 model was more conservative, yielding a ratio of 1.22, while the JSCE-97 model significantly overestimated the punching shear capacity, exhibiting the least accuracy among the models analyzed, with a mean ratio of 1.81 and a standard deviation of 0.126. The findings of this research underscore the viability of NSM-CFRP ropes as an efficient and economical method for restoring heat-damaged concrete slabs. This approach provides a flexible repair solution that requires minimal disruption, positioning it as an ideal option for industrial and infrastructure rehabilitation projects.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"17 ","pages":"Article 100590"},"PeriodicalIF":5.3,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143834360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Additive manufacturing of continuous regenerated cellulose fiber reinforced polylactic acid composites using in-situ impregnation material extrusion technique","authors":"Nishant Jain ,&nbsp;Mathias Czasny ,&nbsp;Till Butzmann ,&nbsp;Delf Kober ,&nbsp;David Karl ,&nbsp;David Schmiedjell ,&nbsp;Sabine Hild ,&nbsp;Aleksander Gurlo","doi":"10.1016/j.jcomc.2025.100594","DOIUrl":"10.1016/j.jcomc.2025.100594","url":null,"abstract":"<div><div>This study explores an innovative approach to additively manufacture 100 % bio-derived, biodegradable polylactic acid (PLA) reinforced with continuous regenerated cellulose fibres (RCFs) using an <em>in-situ</em> infiltration material extrusion technique. The impact of fiber crystallinity, surface properties, cross-sectional geometry and PLA's thermal and rheological behaviour is analysed. Single fiber pull-out test (SFPT) is utilised to evaluate fibre-matrix interactions, while tensile and flexural properties are assessed in conjunction with void analysis via optical and AFM micrographs. The results show that Biomid fibres, which exhibit ∼65 % crystallinity, demonstrate ∼31 % higher apparent interfacial shear strength (IFSS) compared to Cordenka fibres, which exhibit ∼42 % crystallinity. Furthermore, Biomid-PLA composites show a substantial increase in tensile strength, reaching ∼290 % higher and tensile modulus reaching ∼470 % higher than unreinforced PLA. In addition, the flexural strength and modulus of the Biomid-PLA composite increased by ∼71 % and ∼120 %, compared to unreinforced PLA.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"17 ","pages":"Article 100594"},"PeriodicalIF":5.3,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143834361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Review of monolithic composite laminate and stiffened structures in aeronautic applications","authors":"Bruno Castanie,&nbsp;Wiyao Azoti,&nbsp;Laurent Crouzeix,&nbsp;Ajiboye Bello,&nbsp;Rana Piega Taborda,&nbsp;Arslan Mahmood,&nbsp;Anthony Viste","doi":"10.1016/j.jcomc.2025.100585","DOIUrl":"10.1016/j.jcomc.2025.100585","url":null,"abstract":"<div><div>This paper analyses laminated stiffened composite structures in aeronautic applications, covering many key subjects. Since the certification of these structures is based on the test pyramid methodology, several aspects will be addressed, mainly: static sizing and the obtention of allowable values, damage tolerance, post-buckling, large cuts and structural testing. Secondly, the main problems associated with the manufacturing of aeronautical composite structures will be discussed. Finally, a historical presentation of the main milestones in the introduction of fibrous materials will be given, based on the successive appearance of boron, glass and carbon fibres, with the help of a selection of examples. A detailed chronology of the pioneering introduction of carbon fibres into civil aeronautics by European industry will also be provided. Recent researches, trends and innovations will be discussed. Finally, conclusions and perspectives on this wide subject will be proposed.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"17 ","pages":"Article 100585"},"PeriodicalIF":5.3,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143876908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Addressing structural certification challenges with FEM analysis in electric seaplane CFRP wing","authors":"Jonathan Tapullima,&nbsp;Bjørn Haugen","doi":"10.1016/j.jcomc.2025.100584","DOIUrl":"10.1016/j.jcomc.2025.100584","url":null,"abstract":"<div><div>This study explores the structural certification challenges and business objectives for an electric seaplane in the general aviation category, emphasizing the verification of the composite structure under EASA CS-23. Sandwich structures and bonded joints offer significant weight reduction and structural efficiency advantages, crucial for electric aircraft. However, a fatigue damage and tolerance evaluation under CS-23 Level 4 increase these challenges, requiring exhaustive testing, analysis, and documentation to meet stringent regulatory standards. Certification complexities are further intensified by the differences in passenger capacity constraints between Level 3 and Level 4 aircraft, suggesting pursuing Level 3 certification and impacting on the business case of the emerging sustainable aviation. To evaluate the impact on the weight penalties, this study conducts a comprehensive FEM validation and comparison of two different CFRP wing structural analyses: one to comply with Level 3 certification using a monocoque sandwich structure with a bonded assembly, and the other to comply with Level 4 certification using semi-monocoque with a mechanically fastened assembly. The use of different strain allowable values for both levels defined the current strain constraints range for the composite wings, where the monocoque structure analysis showed a mass reduction of up to 19 % on average.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"17 ","pages":"Article 100584"},"PeriodicalIF":5.3,"publicationDate":"2025-03-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143685727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Large-area high thermal conductivity graphite-carboxymethylcellulose film easily produced by mechanical exfoliation of natural graphite using a three-roll mill","authors":"Junhao Wang ,&nbsp;Hongsheng Lin ,&nbsp;Jonathon D. Tanks ,&nbsp;Yoshihiko Arao","doi":"10.1016/j.jcomc.2025.100580","DOIUrl":"10.1016/j.jcomc.2025.100580","url":null,"abstract":"<div><div>With the rapid development of the electronics industry, the demand for superior heat dissipation materials is increasing. Although many studies have been conducted on graphene films with high thermal conductivity, most of them are processed at high temperatures (∼3000 °C) using graphene oxide, which is environmentally harmful and consumes large amounts of energy. This paper reports a simple, low-cost, low-energy, high-efficiency method for the preparation of graphite films using only environmentally friendly materials. Composite films with a thermal conductivity of 298.5 Wm^-1K^-1 were successfully produced by simply dispersing and exfoliating natural graphite and carboxymethylcellulose in a roll mill and depositing by blade coating. Conventional films fabricated using graphene nanoplates (GNP) exhibited a thermal conductivity of 94.6 Wm^-1K^-1, which is significantly lower than the graphite film produced by roll-milling. Experimental and theoretical investigations reveal the reason for this is that the mixed structure of large graphite and small graphite/GNP reduces the interfacial thermal resistance while forming a denser network of heat conduction paths.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"17 ","pages":"Article 100580"},"PeriodicalIF":5.3,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of internal pressure control during manufacturing on residual stresses and safety performance of type 4 pressure vessels","authors":"Bartosz Popiela ,&nbsp;Stephan Günzel ,&nbsp;Marcus Schukar ,&nbsp;Georg W. Mair ,&nbsp;Katerina Krebber ,&nbsp;Holger Seidlitz","doi":"10.1016/j.jcomc.2025.100581","DOIUrl":"10.1016/j.jcomc.2025.100581","url":null,"abstract":"<div><div>Composite pressure vessels are commonly manufactured using the wet filament winding process, where various process parameters can influence the performance of the finished component. In this study two designs of wet filament wound 6.8-liter type 4 composite pressure vessels were manufactured. Both differ only by the internal pressure used during the filament winding, which primarily influences the residual stress state in the composite structure. An extensive experimental study was carried out, including 10 slow burst tests and strain measurements with fiber optic sensors. Significant differences can be observed in the performance of the two designs even though the used stacking sequence, materials and other manufacturing parameters are the same for both designs. A discussion of the differences in the behavior of both cylinder types is provided, including the strain distribution in slow burst tests and failure mechanism.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"17 ","pages":"Article 100581"},"PeriodicalIF":5.3,"publicationDate":"2025-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimal selection of composite layup considering the fuselage crashworthiness","authors":"Dong Wang ,&nbsp;Lin Chen ,&nbsp;Shaohua Ji ,&nbsp;Hua Cao ,&nbsp;Meirong Xiong ,&nbsp;Changchun Wang ,&nbsp;Ju Qiu","doi":"10.1016/j.jcomc.2025.100574","DOIUrl":"10.1016/j.jcomc.2025.100574","url":null,"abstract":"<div><div>This paper will introduce four main sections of content. Firstly, starting from the crashworthiness simulation analysis and test of simple columns, this paper examines the convergence of dynamic simulation models and the rationality of the selection of dynamic parameters. Secondly, after the multi-objective optimization analysis of the fuselage skin layer model, the optimal selection of skin layers is carried out. Under the condition of meeting the static working condition requirements, the Double-double (DD) layer has better dynamic characteristics and lighter mass. Thirdly, the verification of the crashworthiness analysis of the middle fuselage shows that the DD layer still has better dynamic characteristics, lighter mass, and better stability under the condition of meeting the static working condition requirements. Fourthly, by analyzing the constitutive relationship of the fuselage skin and programming analysis, the composite skin with the same quality has a higher bending-torsion stiffness and bending-torsion coupling stiffness with DD layers.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"16 ","pages":"Article 100574"},"PeriodicalIF":5.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527313","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Planar fibre winding for topological optimized composite structures","authors":"O. Döbrich,&nbsp;S. Steiner,&nbsp;P. Böhler,&nbsp;R. Radis","doi":"10.1016/j.jcomc.2024.100545","DOIUrl":"10.1016/j.jcomc.2024.100545","url":null,"abstract":"<div><div>Conventional manufacturing techniques for composites are constrained by the shell design realized from laminated materials. The layer-wise architecture limits their use in complex 3D geometries and leads to uneven structural performance in multi-axial load scenarios. This study introduces a novel planar fibre-winding process for manufacturing topologically optimized composite structures. The proposed method utilizes a continuous process where a carbon fibre roving is wound onto a complex 3D printed winding core. This approach enables the creation of a truss-like structure that closely follows the optimal load paths. The winding process is automated using a 3-axis gantry system, allowing precise fibre placement to form spatially complex structures. The mechanical performance of a complex wound structures was evaluated against traditionally milled aluminium parts. Tensile testing of dry rovings and composite samples provide insights into the effects of process-induced damage on the mechanical performance of the composites. Significant performance improvements compared to conventional metal component design is achieved. The composite structures showed a 55 % reduction in weight compared to milled aluminium components, while achieving a 160 % increase in specific stiffness in out-of-plane bending tests. The process also demonstrates high reproducibility and minimized material waste. The advanced fibre-winding process offers a promising composite manufacturing technique.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"16 ","pages":"Article 100545"},"PeriodicalIF":5.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comparative analysis of shear behavior in continuous low-strength RC beams strengthened with BFRP and CFRP: An experimental and numerical investigation","authors":"Mu'tasim Abdel-Jaber ,&nbsp;Rawand Al-Nsour ,&nbsp;Aseel Almahameed ,&nbsp;Ahmed Ashteyat","doi":"10.1016/j.jcomc.2025.100575","DOIUrl":"10.1016/j.jcomc.2025.100575","url":null,"abstract":"<div><div>The integration of Basalt Fiber-Reinforced Polymer (BFRP) materials marks a significant advancement in sustainable construction. This study evaluates the impact of externally bonded BFRP and Carbon Fiber-Reinforced Polymer (CFRP) sheets and laminates on the shear strength of reinforced concrete (RC) beams with a compressive strength of 20 MPa. Seven full-scale, two-span RC beams, each four meters in length, were tested, with identical strengthening patterns applied to both BFRP and CFRP sheets to allow for a direct comparison. One beam served as a control sample to assess the effectiveness of the strengthening techniques. Results showed that CFRP improved the shear capacity of the beams by 38.3 % to 46.6 %, while BFRP provided an increase of 9.7 % to 32.5 %, demonstrating substantial gains in load-carrying capacity for both materials, though CFRP showed a higher performance boost while BFRP materials are an economical alternative for CFRP materials, and the most effective strengthening configuration for both fiber types is full side coverage, as it offers superior confinement of the concrete. These findings were well-aligned with Finite Element Modeling predictions and theoretical expectations, closely matching ACI 440.2R-08 guidelines.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"16 ","pages":"Article 100575"},"PeriodicalIF":5.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143520750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanical performance of aluminum/copper/aluminum nanocomposite at different temperatures using molecular dynamics simulation","authors":"Narinderjit Singh Sawaran Singh ,&nbsp;Ali B.M. Ali ,&nbsp;Shahram Babadoust ,&nbsp;Rasha Abed Hussein ,&nbsp;Soheil Salahshour ,&nbsp;Sh. Baghaei ,&nbsp;S. Mohammad Sajadi","doi":"10.1016/j.jcomc.2025.100572","DOIUrl":"10.1016/j.jcomc.2025.100572","url":null,"abstract":"<div><div>With the expansion of science and technology, the application and importance of composites in various industries increased. Aluminum /copper metal layer composites are widely used for their fracture toughness, corrosion resistance, and high electrical conductivity. This research simulated an Aluminum /copper/Aluminum tri-layer nanocomposite to investigate the effects of different temperatures (T = 300, 350, 375, 400, 450, and 500 K) on its mechanical properties. The stress, strain rate, yield strength, and ultimate strength values were recorded. The results indicate that the physical stability of the sample remained unaffected as temperature increased, while the attraction force among different particles was observed. Furthermore, the simulation results suggest that the mechanical strength of aluminum/copper/aluminum tri-layer nanocomposite decreased with rising initial temperature in the computational box. Specifically, the ultimate strength and Young's modulus of nanocomposites reduced to 2.186 GPa and 12.727 GPa, respectively, at 500 K. Aluminum /copper/Aluminum tri-layer nanocomposite showed promising potential for real-world applications, particularly in sectors requiring materials with enhanced mechanical properties. It is expected that these composites will be utilized in advanced engineering fields, such as aerospace and automotive industries, where their high strength-to-weight ratio and thermal stability can significantly improve performance and efficiency.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"16 ","pages":"Article 100572"},"PeriodicalIF":5.3,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143510210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}