Composites Part C Open Access最新文献

{"title":"Broadband low-frequency diffuse sound transmission loss of multilayer composite plate-type metamaterials","authors":"Boxin Chang ,&nbsp;Shuaixing Wang ,&nbsp;Gaoge Liang ,&nbsp;Quanxing Liu ,&nbsp;Yong Xiao","doi":"10.1016/j.jcomc.2025.100620","DOIUrl":"10.1016/j.jcomc.2025.100620","url":null,"abstract":"<div><div>Low-frequency sound insulation is one of the most challenging problems in the field of noise control engineering because of the classical mass law. Recent studies have shown that acoustic metamaterials can achieve a sound transmission loss (STL) higher than the mass law at specific low frequencies. However, it is still difficult to realize superior STL that can deeply break the mass law over a broadband low-frequency range, especially under the excitation of diffuse field sound. To challenge this problem, we suggest a multilayer composite plate-type metamaterial (MCPM) consisting of two single-layer metamaterial plates and a sandwiched layer of porous material. The metamaterial plates are simply constructed by a thin plate attached with periodic strip masses. We present an in-depth theoretical analysis and experimental verification of the STL performance of the MCPM. The results indicate that with proper design, the MCPM can achieve an excellent diffuse STL over an ultra-broadband low-frequency range, while avoiding the significant reduction of immediately following high-frequency STL. Owing to its simple construction yet superior low-frequency diffuse sound insulation performance, the MCPM can find promising applications in noise control engineering.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"17 ","pages":"Article 100620"},"PeriodicalIF":5.3,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144331202","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":"Evaluation of the strain gradient effect on compressive failure of CRFP composites","authors":"Tobias Bianchi ,&nbsp;Jawad Naciri ,&nbsp;Joël Serra ,&nbsp;Christophe Bouvet ,&nbsp;Léon Ratsifandriahana","doi":"10.1016/j.jcomc.2025.100621","DOIUrl":"10.1016/j.jcomc.2025.100621","url":null,"abstract":"<div><div>A pin-ended buckling test inspired by Wisnom [<span><span>1</span></span>] was developed to evaluate the effect of strain gradient on the compressive failure strain of composite laminates. Tests were conducted on unidirectional (UD) carbon/epoxy AS4/8552, and strain measurements were obtained using digital image correlation. Various cross-ply stacking sequences, [(0/90)₂]_S, [(0/90)₄]_S, [(0/90)₈]_S, were studied and most specimens failed on the tension side due to the high compressive strength facilitated by the strain gradient, while the tensile failure strain remained unaffected by the strain gradient. To induce failure on the compression side, a novel method was developed by manufacturing bi-material specimens with an aluminum 2024 ply added to the tension side. This modification led to all bi-material specimens failing on the compression side. The results showed a Nnar increase in compressive failure strain as a function of the strain gradient. Furthermore, values reaching up to -33,000 microstrains were obtained for the thinner specimens, which is &gt;2.5 times the compressive failure strain of -12,500 microstrains announced by the manufacturer. This behavior is new compared to other published results obtained on similarly tested materials that demonstrated a linear trend.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"17 ","pages":"Article 100621"},"PeriodicalIF":5.3,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144470594","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":"Effect of fibre hybridization on interfacial micro-stress fields using 3D RVEs","authors":"G. Romano ,&nbsp;Y. Yang ,&nbsp;K.B. Katnam ,&nbsp;Z. Zou ,&nbsp;P. Potluri","doi":"10.1016/j.jcomc.2025.100622","DOIUrl":"10.1016/j.jcomc.2025.100622","url":null,"abstract":"<div><div>This study investigates the effect of the degree of fibre-hybridization (<em>i.e.,</em> fibre volume fractions) and fibre type (<em>i.e.,</em> primary and secondary) in uni-directional composite laminae with intra-laminar hybridisation on lamina elastic constants and micro-stress fields, with an emphasis on interfacial micro-stress, using three-dimensional representative volume elements (3D RVEs). Primary fibres (<em>i.e.,</em> S-glass and carbon AS4), fibres with a reinforcing role, and secondary fibre (<em>i.e.,</em> polypropylene, PET and PEEK), fibres with a toughening role, have been employed in this study. A micro-mechanical study using six independent loading cases has been conducted to predict the nine engineering constants and specific elastic lamina properties for hybrid and non-hybrid fibre composite laminae. The focus of the study is on interfacial (<em>i.e.,</em> de-bonding) and matrix-dominated failure modes, and transverse tension, transverse shear and longitudinal shear loading are investigated. Validation of the model developed and employed in this study has been performed comparing the nine engineering constants predicted using FEA results against experimental data and two firmly established analytical models (<em>i.e.,</em> Chamis and Mori-Tanaka). The effect of (a) primary and secondary fibre volume fractions, (b) the thermoplastic fibre diameter, and (c) using different thermoplastic fibres on homogenised properties and the micro-stress fields in uni-directional fibre-hybrid S-glass/secondary/epoxy and carbon/secondary/epoxy laminae are analysed. The findings highlight the importance of intra-laminar fibre hybridization in shaping lamina properties and micro-stress fields. Notably, employing different primary and second fibres alters the matrix and the fibre-matrix interfaces micro-stress fields. The stiffness and fibre volume fractions of the primary and secondary fibres are the major parameters affecting the elastic lamina properties and micro-stress fields. This aspect holds promise as an avenue for further exploration in terms of manipulating damage modes and, consequently, the mechanisms governing energy dissipation.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"17 ","pages":"Article 100622"},"PeriodicalIF":5.3,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144338961","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":"Development of sustainable thermoplastic jute prepregs by emulsion impregnation for biocomposites","authors":"Muhammad Mahad Umair Saqib ,&nbsp;Asif Hafeez ,&nbsp;Hassan Mehboob ,&nbsp;Khubab Shaker","doi":"10.1016/j.jcomc.2025.100619","DOIUrl":"10.1016/j.jcomc.2025.100619","url":null,"abstract":"<div><div>The use of thermoplastic composites reinforced with plant fibers has been in high demand due to their lightweight, recyclability and sustainability. However, conventional composite manufacturing processes are incompatible with natural fibers to get the desired impregnation level with thermoplastic matrices. There is a need to develop a sustainable, economical pre-impregnation method for better resin dispersion, extended shelf life, and faster production. This study aims to investigate a method for producing thermoplastic emulsion and its processing with plant fibers. Prepregs were fabricated using jute yarn and emulsion to prepare biocomposites via compression molding. These biocomposites were fabricated with six stacking sequences (A0450, A904590, A459045, A45045, A0900, and A90090). The mechanical performance of these composites showed strong dependence on the stacking sequence. The results revealed that the highest tensile strength of 17.02 MPa was exhibited by A0450, while a reduction of 94 % and 91 % in tensile strength was observed for laminates A459045 (1.55 MPa) and A904590 (1.01 MPa), respectively. The results of the short beam test showed a similar trend with no interlaminar failure. The inherent ductile nature of the matrix resulted in a rebound during a drop-weight test, and A0450 and A90090 showed the maximum load-bearing properties. The composites produced showed proper fiber impregnation and perfect interfacial adhesion, thus overcoming the limitations associated with traditional thermoplastic matrices. Further optimization of the developed acrylic emulsion could emerge as a potential substitute for conventional thermoplastics for the development of sustainable composites.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"17 ","pages":"Article 100619"},"PeriodicalIF":5.3,"publicationDate":"2025-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144338962","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":"Comparison of ballistic performance of Dyneema®, hardened tool steel & alumina composite for low and medium velocity impact: a numerical approach","authors":"Harsh Navangul ,&nbsp;Kushagra Kumar ,&nbsp;Davidson Jebaseelan ,&nbsp;Awani Bhushan ,&nbsp;Devendran Thirunavukkarasu ,&nbsp;Rajnish Mallick ,&nbsp;Sandip Saha ,&nbsp;Bisheshwar Haorongbam","doi":"10.1016/j.jcomc.2025.100618","DOIUrl":"10.1016/j.jcomc.2025.100618","url":null,"abstract":"<div><div>Human safety is the one of the most crucial aspects in defence industry. Every life matters therefore to protect a person from bullet impact it is of utmost importance to study bullet armour. Traditionally, these armour plates were made up of steel, aluminium, and recently, various fabrics like Ultra High Molecular Weight Polyethylene (UHMWPE), Kevlar, Twaron etc are reinforced with materials like steel, carbon fiber, ceramics etc. The present work studies ballistic composite of viz., Dyneema®, hardened tool steel and alumina that is light in weight, easy to manufacture, has high strength, and less damage at medium velocity profiles for a standard sized bullet. The armour composite plates were designed by varying their layer wise composition and thickness. A standard sized bullet of diameter 7.62 mm was impacted on them with two velocities: 200 m/s and 300 m/s. The various composite designs were composed of Dyneema® (UHMWPE), Hardened tool steel (HTS) &amp; Alumina. It was found that the plate with composition of Dyneema® reinforced with HTS was able to stop the bullet in lesser time in comparison to the plate which had Dyneema®-Alumina-HTS composition. But on the other side the Dyneema®-HTS-Alumina composite was found out to be lighter in weight. The strength and hardness of HTS plays a major role in the Dyneema® reinforced HTS with bullet facing material (UHMWPE) absorbing the required bullet energy. For higher velocity the 9.5 mm configuration of Dyneema® with HTS is recommended but for lower velocity 5 mm configuration would suffice. The outcome of the current work is very much beneficial to various defence technologies.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"17 ","pages":"Article 100618"},"PeriodicalIF":5.3,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144306845","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":"Integration of composite-structure forming and optical fiber sensing using tool-change 3D printing","authors":"Gen Watanabe ,&nbsp;Issei Ogawa ,&nbsp;Hiroshi Ikaida ,&nbsp;Mitsuo Matsunaga ,&nbsp;Ryosuke Matsuzaki","doi":"10.1016/j.jcomc.2025.100611","DOIUrl":"10.1016/j.jcomc.2025.100611","url":null,"abstract":"<div><div>Using a tool-change 3D printer, this study investigated the integration of structural formation and functional enhancement in 3D printing. Traditionally, single-material printing is the standard, making the combination of mechanically robust structures, such as those using fiber-reinforced composites, and functional enhancements, such as conductive materials, challenging. In this study, a tool-change system was implemented to enable material-specific print-head operation, enabling the simultaneous fabrication of structural and functional elements in a single process. Moreover, to reduce the impact of internal defects in functional enhancement, this study explored printing methods for existing sensors. Focusing on optical fibers for their continuous thread-like structure, they were processed into filaments by combining them with resin. These filamentized optical fibers demonstrated the ability to achieve sub-millimeter precision in printing. Additionally, the optical fibers exhibited measurement accuracy comparable to conventional sensors, highlighting their suitability as high-performance sensing components. By incorporating optical fibers into 3D printing, this study enabled the stable integration of high-quality sensors into printed components. Utilizing a tool-changing approach, it demonstrated the feasibility of combining entirely different materials in a single process. This achievement highlights the potential of tool-change systems to advance multi-material 3D printing, balancing structural formation with functional integration, and laying the foundation for innovative applications in additive manufacturing.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"17 ","pages":"Article 100611"},"PeriodicalIF":5.3,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144262693","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":"Novel geometric functionally graded auxetic double arrowhead lattice structures design: Tailored unit cell angles for superior energy absorption","authors":"Amin Dadashi ,&nbsp;Kamel Hossein Nedjad ,&nbsp;Amin Farrokhabadi ,&nbsp;S.Amir M. Ghannadpour","doi":"10.1016/j.jcomc.2025.100613","DOIUrl":"10.1016/j.jcomc.2025.100613","url":null,"abstract":"<div><div>Due to the importance of energy absorption in various industries, including aerospace, automotive, and marine, lightweight energy absorbers such as auxetic structures under in-plane loading have attracted significant attention. This study introduces and systematically investigates novel Geometric Functionally Graded (GFG) auxetic double arrowhead lattice structures, where performance enhancement is achieved by strategically varying the constituent unit cell angles along the loading direction—a distinct approach from conventional thickness-grading. The aim encompasses the design, fabrication (via Fused Filament Fabrication), and quasi-static compressive testing of thirteen distinct lattice configurations, including seven uniform and six GFG designs, with their mechanical behavior and energy absorption characteristics rigorously analyzed and validated through finite element simulations. Results indicated that the angle of the auxetic double arrowhead unit cell is the crucial geometric parameter affecting mechanical behavior and dominant failure modes. The volumetric energy absorption and specific volumetric energy absorption of the auxetic double arrowhead lattice structure with geometric functionally graded with α = 14° to 20° are 81 % and 173 % higher, respectively, compared to the uniform auxetic double arrowhead lattice structure with α = 10° In light of these findings, geometric functionally graded designs offer superior energy absorption performance for auxetic double arrowhead lattice structures with negative Poisson's ratio compared to conventional uniform arrangements.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"17 ","pages":"Article 100613"},"PeriodicalIF":5.3,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144270124","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":"Behaviour of strengthened RC beams with CFRP and GSM sheets under cyclic loading","authors":"Maha Assad,&nbsp;Rami A. Hawileh,&nbsp;Jamal A. Abdalla,&nbsp;Hussam Safieh,&nbsp;Sayan Kumar Shaw","doi":"10.1016/j.jcomc.2025.100617","DOIUrl":"10.1016/j.jcomc.2025.100617","url":null,"abstract":"<div><div>This study investigates the structural behaviour of reinforced concrete (RC) beams subjected to cyclic loading. Four beam configurations were tested: a control beam (C) and beams externally strengthened with carbon fiber-reinforced polymer (CFRP) sheets, steel mesh sheets bonded with epoxy (SME), and steel mesh sheets bonded with mortar (SMM). The experimental program adhered to the evaluation criteria outlined by ACI437R-03. Although the tested beams satisfied the repeatability limit specified by the committee, the deviation from linearity and permanency limits could not be satisfied. The performance of the beams was also evaluated in terms of load-deflection behaviour, stiffness degradation, energy dissipation, and brittleness. The hysteresis loops of the tested beams revealed significant differences in energy dissipation. Strengthened beams exhibited larger hysteresis loop areas, reflecting their enhanced energy absorption and dissipation capacity. In contrast, the control beam demonstrated smaller and narrower loops. The SMM beam consistently outperformed other configurations, achieving the highest flexural load-carrying capacity and dissipation energy. Post-cyclic monotonic loading tests further evaluated the residual behaviour of the beams. The percentage increase in flexural strength ranged from 38 to 51 % compared to the control unstrengthened beam. Therefore, it is concluded that strengthening significantly improves the behaviour of RC beams under cyclic loading.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"17 ","pages":"Article 100617"},"PeriodicalIF":5.3,"publicationDate":"2025-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144240982","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":"Effects of elevated temperature on basalt and glass FRP bars in prismatic beams under flexural loading","authors":"Nour Ghazal Aswad ,&nbsp;Mohammed Al Dawood ,&nbsp;Farid Abed","doi":"10.1016/j.jcomc.2025.100616","DOIUrl":"10.1016/j.jcomc.2025.100616","url":null,"abstract":"<div><div>Fiber-reinforced polymer (FRP) reinforcement has gained significant attention in research and structural applications due to its desirable mechanical properties and durability. Advances have been made in understanding FRP’s resistance to elevated temperatures; however, uncertainties persist due to inconsistencies in the available experimental data. This study presents an experimental investigation into the effects of various parameters on the performance of reinforced concrete (RC) prismatic beams exposed to elevated temperatures. Key parameters included reinforcement type (steel, Glass FRP (GFRP), and Basalt FRP (BFRP), bar diameter (16 mm and 20 mm), surface texture (ribbed and sand-coated), and concrete cover (40 mm and 60 mm). The prismatic beams were subjected to target temperatures of 200, 400, and 700 °C, followed by testing in a four-point loading setup. The experimental results revealed that BFRP-reinforced prismatic beams exhibited a 17 % higher residual load-carrying capacity and 32.3 % greater toughness at 200 °C and 400 °C, but a 22 % lower capacity and 26.9 % reduction in toughness at 700 °C compared to their GFRP-reinforced counterparts. Additionally, prismatic beams reinforced with sand-coated GFRP bars showed up to a 27 % improvement in load-carrying capacity compared to those with ribbed GFRP bars, and a larger concrete cover contributed to better overall flexural performance of the prismatic beams under elevated temperatures.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"17 ","pages":"Article 100616"},"PeriodicalIF":5.3,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144221026","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":"3D observation of delamination in carbon-fibre-reinforced composites under mode II loading through in situ computed tomography","authors":"Panayiotis Tsokanas,&nbsp;Thanasis Chatziathanasiou,&nbsp;Yentl Swolfs","doi":"10.1016/j.jcomc.2025.100615","DOIUrl":"10.1016/j.jcomc.2025.100615","url":null,"abstract":"<div><div>Delamination is among the most prevalent life-limiting failure modes in laminated composites. Mode II delaminations, driven by in-plane shear loads, are more difficult to observe than mode I delaminations. Conventional edge observation techniques fail to capture the three-dimensional (3D) delamination front and its associated damage mechanisms. We conduct the first in situ X-ray computed tomography (CT) experiment to observe the 3D development of delamination under mode II loading. We apply four-point end-notched flexure loading to two types of thin-ply, carbon-fibre-reinforced composite laminates: a 0° laminate and a cross-ply laminate susceptible to delamination migration. The method is proven capable of capturing delamination growth and migration within the bulk of the laminates at the meso- and microscale, something unattainable using conventional techniques. This work thus demonstrates the benefits of in situ CT in determining the damage mechanisms involved in mode II fracture loading.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"17 ","pages":"Article 100615"},"PeriodicalIF":5.3,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144313006","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}