Composites Part C Open Access最新文献

{"title":"Strengthening and repairing of a one-way solid slab exposed to thermal effect using CFRP Grid","authors":"Mu’tasim Abdel-Jaber ,&nbsp;Layla Magharbeh ,&nbsp;Mousa Shhabat ,&nbsp;Ahmed Ashteyat","doi":"10.1016/j.jcomc.2025.100694","DOIUrl":"10.1016/j.jcomc.2025.100694","url":null,"abstract":"<div><div>Exposure of reinforced concrete (RC) elements to high temperatures, leads to severe deterioration in mechanical properties. Carbon Fiber Reinforced Polymer (CFRP) have recently emerged as a promising method for strengthening fire-damaged RC members due to their high strength-to-weight ratio and ease of installation. This study evaluates the effectiveness of CFRP grids in strengthening and repairing thermally damaged one-way RC solid slabs. Eight slabs (1800 × 500 × 100 mm) were cast and exposed to a uniform temperature of 600 °C. Three CFRP grid configurations were examined: two slices, three slices, and a full-surface application. The performance of the slabs was assessed through experimental testing, numerical modeling, and theoretical analysis. The experimental results demonstrated significant recovery and enhancement of structural capacity, with ultimate load increases of 11.1 % to 29.9 % for strengthened slabs and 19.3 % to 41.4 % for repaired slabs relative to their control specimens. The stiffness of repaired slabs increased by up to 117 %, while peak deflection decreased by 47 %. In addition, the numerical results exhibited strong correlation with experimental results, showing deviations below 12 % in ultimate load and 8 % in deflection, validating the adopted nonlinear modeling approach. Finally, the theoretical results based on ACI 440.2R-17 showed close agreement with experimental results, with predicted capacities by only 2.2 %–7.1 % for strengthened slabs and 2.2 %–14.2 % for repaired slabs. The study demonstrates the effectiveness of CFRP grid in restoring the mechanical performance of reinforced concrete slabs exposed to elevated temperatures.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"19 ","pages":"Article 100694"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145925593","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":"Mycelium biocomposites from spent coffee grounds, rice husk, and recycled paper for temporary eco-road guideposts: Microstructure-property relationships, fire resistance, and outdoor durability","authors":"Pimpet Sratong-on ,&nbsp;Supaluk Prapan ,&nbsp;Warangkana Chaithanee ,&nbsp;Kanyarat Puttawongsakul ,&nbsp;Sutep Joy-A-Ka","doi":"10.1016/j.jcomc.2026.100699","DOIUrl":"10.1016/j.jcomc.2026.100699","url":null,"abstract":"<div><div>Mycelium biocomposites (MBCs) offer a sustainable, zero-waste alternative for non-structural construction materials. This study investigated the influence of substrate morphology on MBC properties by using two novel waste streams: fibrous recycled paper (RP) alone and a particulate co-substrate of high-content spent coffee grounds (SCG) mixed with rice husks (RH), mainly for non-structural construction components (road guidepost). Three compositions of MBCs were fabricated: (MBC/RP, MBC/SCG50-RH50, MBC/SCG80-RH20). Compression test, water absorption, and fire resistance performance were characterized alongside microstructural analyses via SEM and X-ray μCT. Experimental results disclosed that substrate morphology critically governs MBC performance. MBC/RP achieved the highest compressive strength (1.67 MPa) at high strain 0.58 mm/mm and an excellent V-0 fire rating due to dense mycelial entanglement with fibrous substrate and protective char layer formation. Conversely, MBC/SCG-RH groups exhibited lower strength (0.25–0.46 MPa) and fire resistance. Nevertheless, MBC/SCG80-RH20 achieved the highest stiffness (2.41 MPa) and exhibited brittle behavior, linked to SCG-RH particle interlocking that created a closed-pore structure (58.27–61.61 % porosity) and significantly lower water uptake (130 %) than open-pored MBC/RP (272 % water uptake and 52.87 % porosity). Accordingly, MBC/SCG-RH groups are better suited for biodegradable packaging while MBC/RP was the only candidate satisfying non-structural construction materials specifications. Despite susceptible to high moisture, MBC/RP maintained structural integrity in dry environments, demonstrating a functional lifespan exceeding three months. The practical feasibility was validated by successfully fabricating an initial 1:4 scale MBC/RP road guidepost prototype. These findings confirm the potential of tailoring waste resources to meet mechanical, fire performance, and degradability for non-load-bearing outdoor applications.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"19 ","pages":"Article 100699"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146077397","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":"Why selected autoclave-cured Double–Double laminates are particular prone to warpage","authors":"Erik Kappel ,&nbsp;Ronald Klomp","doi":"10.1016/j.jcomc.2026.100701","DOIUrl":"10.1016/j.jcomc.2026.100701","url":null,"abstract":"<div><div>Double–Double (DD) laminates provide unique design and manufacturing opportunities. This makes them a promising challenger for conventional laminates used in aerospace composite parts today. DD laminates benefit from an effect denoted as ’homogenization’, which leads to a mechanical behavior known from orthotropic laminates, without complex coupling effects, although DD laminates have asymmetric ply-stacking sequences. Manufacturing aspects and particularly the topic of process-induced distortions (PID) have attracted little attention in DD context. The present article is dedicated to this topic. It outlines why some DD laminates show warpage and twist after a typical 180°C curing process, while others remain almost flat. Hence, the article provides practical guidance for selecting building-block stacking sequences, which induce minimum warpage.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"19 ","pages":"Article 100701"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146077396","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":"Damage mechanisms of adhesively bonded joints of thin tow-based discontinuous composites","authors":"Ioannis Katsivalis ,&nbsp;Rosemere de Araujo Alves Lima ,&nbsp;Florence Moreau ,&nbsp;Leif E. Asp ,&nbsp;Sofia Teixeira de Freitas","doi":"10.1016/j.jcomc.2025.100690","DOIUrl":"10.1016/j.jcomc.2025.100690","url":null,"abstract":"<div><div>Tow-Based Discontinuous Composites (TBDCs) are a new class of composite materials that combine high strength and stiffness with in-plane isotropy making them of interest in high-end structural applications. Despite their potential, efficient connection methods are currently lacking and the adhesive bonding behaviour of TBDC structures remains unexplored. This work, therefore, seeks to address this gap by analysing the quasi-static performance of TBDC adhesive joints under mode I loading condition. Double Cantilever Beam (DCB) tests were performed using two adhesives with contrasting toughness levels: a moderate (∼600 J/m ²) and a high toughness adhesive (&gt; 2400 J/m²). When a moderate-toughness adhesive was used, a combination of cohesive failure and composite damage was observed, with only a small scatter in the experimental results. In contrast, the use of the high-toughness adhesive led to a shift in damage mechanisms towards the composite micro-architecture, resulting in fracture toughness values in the region of 800 J/m², with a larger experimental scatter. Acoustic Emission analysis identified matrix cracking and fibre/matrix debonding as the dominant damage mechanisms. These findings were validated by the post-mortem fractography analysis via Scanning Electron Microscopy. This work therefore provides the first detailed analysis of the damage mechanism in adhesively bonded TBDCs, which have potential in aerospace and automotive applications.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"19 ","pages":"Article 100690"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145925644","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":"Laser based surface texturing and PA6 powder interlayering for joining enhancement of DP600/PA6GF47 hybrid joints via induction welding","authors":"K. Boukhadra ,&nbsp;Z. Jendli ,&nbsp;J-C. Walrick ,&nbsp;R. Zouaghi ,&nbsp;A. Kouadri-Henni","doi":"10.1016/j.jcomc.2025.100693","DOIUrl":"10.1016/j.jcomc.2025.100693","url":null,"abstract":"<div><div>This study investigates a novel approach combining laser surface microtexturing with PA6 powder interlayering to enhance the joining performance of DP600 steel/PA6GF47 thermoplastic composite hybrid joints via induction welding. Four joining conditions were evaluated: no texture-no powder (NT-NP), no texture-powder (NT-P), texture-no powder (T-NP), and texture-powder (T-P). Laser texturing parameters were optimized to create controlled micro-groove patterns with uniform depth and periodicity on DP600 steel surface. A thin PA6 powder layer was applied at the bonding interface prior to induction welding. Mechanical testing revealed that the combined texture-powder (T-P) configuration achieved the highest shear strength of 19,5 MPa, representing a 170% improvement over untreated joints (7,2 MPa). Microscopic analysis demonstrated that the synergistic effect of laser texturing and powder interlayering promotes complete polymer infiltration into surface microstructures, creating robust mechanical interlocking. Thermal analysis confirmed optimal processing temperatures for PA6 melting without degradation. The fracture mode shifted from interfacial failure to mixed-mode failure with fibre pull-out, indicating superior metal-composite bonding. This integrated approach offers a promising solution for lightweight structural assemblies in automotive and aerospace applications.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"19 ","pages":"Article 100693"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145925592","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":"Probabilistic integrity assessment of rehabilitated cracked polygonal tubes: Implications from FEA and multi-parameter sensitivity analysis","authors":"Kiarash Alidadi,&nbsp;Hadi Eskandari","doi":"10.1016/j.jcomc.2026.100697","DOIUrl":"10.1016/j.jcomc.2026.100697","url":null,"abstract":"<div><div>The present study examines the fracture reliability and efficiency of reinforced cracked tubes, and provides a comprehensive probabilistic integrity assessment of cracked polygonal tubes, moving beyond traditional circular geometries. The most common of mechanical damages in pipes is dents, gouges, cracks and scratches, which severely threaten structural integrity. However, while these forms of mechanical damage are widely detected in polygonal pipes, there is a notable lack of research focusing on their behavior and repair in polygonal tube geometries. To this end, a three-dimensional finite element model (FEM), incorporating extended FEM (XFEM) for crack growth analysis, was developed to estimate stress intensity factors (SIFs) and analyze crack propagation in repaired metallic tubes with surface cracks. A novel integration of Monte Carlo simulations with surrogate modeling based on regression analysis enabled efficient and accurate evaluation of probabilistic failure scenarios and uncertainties. The sensitivity and impact of key parameters, including crack geometry, crack orientation angle, axial tensile pressure, stiffener thickness, and cross-sectional polygonality, were analyzed using Sobol-based global sensitivity analysis. Results indicated that circular cross-sections and thicker reinforcements significantly increased the fracture resistance, and crack orientation was the most influential uncertainty. In addition, composite sleeves demonstrated a sound reduction in SIFs from 1.05 (unrepaired) to 0.33 (repaired) for triangular tubes and from 0.98 (unrepaired) to 0.29 (repaired) for rectangular tubes, whereas the circular tubes showed a decrease from 0.89 to 0.28). from 1.05 to 0.33 in the triangular section. Concurrently, the probability of failure before repair was 8.9 % for rectangular tubes, 6.2 % for triangular tubes, and 3.7 % for circular tubes; after composite repair, these values were substantially reduced to 1.1 %, 0.7 %, and 0.3 %, respectively. These results clearly demonstrate a significant improvement in structural reliability across all tube geometries. The explicit investigation of polygonal cross-sectional effects on fracture mechanics and repair efficiency represents a significant advancement over prior works focused solely on cylindrical tubes. This research highlights the necessity of including axial load scenarios in future design codes and repair watermarks. Suggestions include prioritizing crack angle management, robust composite repairs, and targeting inspections on identified sensitivities to improve tube safety and reliability.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"19 ","pages":"Article 100697"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187381","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":"Analytical and numerical modelling of in-situ processing, mechanical performances and applications in automated fibre placement (AFP) – A review","authors":"Changze Sun ,&nbsp;Vaibhav Phadnis ,&nbsp;Alireza Moradi ,&nbsp;Jin Zhou ,&nbsp;Mohamed Nasr Saleh ,&nbsp;Zhongwei Guan","doi":"10.1016/j.jcomc.2026.100707","DOIUrl":"10.1016/j.jcomc.2026.100707","url":null,"abstract":"<div><div>Automated Fibre Placement (AFP) is a widely adopted composite manufacturing process in the aerospace, automotive, and pressure vessel industries. Over the past 30 years, the process has experienced significant advancements, with analytical in-situ process modelling and finite element (FE) simulations remaining key areas of research for current and future development. This review highlights various modelling and simulation approaches used to assess the mechanical performance of AFP-manufactured products across different applications. Additionally, it explores fundamental research on the effects of defects and in-situ processing parameters on AFP. It also reviews newly developed machine learning techniques applied in this field.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"19 ","pages":"Article 100707"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187377","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":"Multiscale mechanical property prediction of unidirectional fiber-reinforced composites containing resin-deficient defects","authors":"Mingxuan Li ,&nbsp;Yaosheng Liang ,&nbsp;Zhibo Duan ,&nbsp;Xinwei Lin ,&nbsp;Xiaolei Zhu","doi":"10.1016/j.jcomc.2026.100704","DOIUrl":"10.1016/j.jcomc.2026.100704","url":null,"abstract":"<div><div>A prediction model for mechanical property of composites with resin-deficient defects was established. Based on the homogenization theory, the characteristic parameters (volume fraction) of the resin-deficient defects were introduced into the Chamis equation, and the equivalent mechanical property solutions of these composites were deduced. In this way, the prediction models for the mechanical properties of composites with resin-deficient defects were developed, and the theoretical calculation were compared with the simulation data and the reported testing data. The maximum prediction errors of elasticity parameter and strength parameter are &lt;9% and under 12%, respectively, and the errors from the experimental data are below 4%. With the model above, accurately forecasting the mechanical properties of composites with resin-deficient defects is highly feasible. The transverse elastic modulus and shear modulus are more sensitive to the resin-deficient defects in the composites. Even if the content of resin-deficient defects is small, the defects will remarkably influence the transverse tensile and shear strengths. The general changing trend of elasticity and strength parameters drops with the rising level of resin-deficient defects.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"19 ","pages":"Article 100704"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187373","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":"Corrigendum to: Seismic rehabilitation of flexure-damaged RC shear walls using a hybrid UHPC–FRP composites with EBROG-installed strips and FRP anchors [Journal of Composite Part C: Open Access, Volume 18 (2025), Article 100665]","authors":"Mehdi Khorasani,&nbsp;Davood Mostofinejad,&nbsp;Ali MohammadSalehi","doi":"10.1016/j.jcomc.2025.100686","DOIUrl":"10.1016/j.jcomc.2025.100686","url":null,"abstract":"","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"19 ","pages":"Article 100686"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147395051","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":"Design, modeling, and performance analysis of novel mechanically adaptive 2-1-2-type piezoelectric composite structures","authors":"Jinying Zhang ,&nbsp;Jiacheng Wang ,&nbsp;Zhongwei Gao ,&nbsp;Jiaxing Yang ,&nbsp;Jialin Chen ,&nbsp;Bingnan Wang ,&nbsp;Ruiheng Zhang ,&nbsp;Shuai Xu ,&nbsp;Chong Zhao ,&nbsp;Chao Zhong ,&nbsp;Lei Qin","doi":"10.1016/j.jcomc.2026.100709","DOIUrl":"10.1016/j.jcomc.2026.100709","url":null,"abstract":"<div><div>Flexible ultrasonic transducers are important for wearable medical imaging and therapeutic applications, yet combining high electromechanical performance with structural conformity and array uniformity remains difficult. Here, a 2-1-2-type piezoelectric composite consisting of PZT-4, epoxy resin, and silicone rubber is prepared through a monolithic dice-fill technique. A series-parallel equivalent model is employed to guide the structural optimization of the composite. Based on the theoretical analysis, representative samples with ceramic volume fractions of <em>v</em>_c = 50 % and 60 % and a substrate volume fraction of <em>v</em>_p = 20 % are selected for fabrication and experimental validation. These composites exhibit high-purity thickness vibration, a thickness electromechanical coupling coefficient (<em>k</em>_t) of 0.62, and an acoustic impedance (<em>Z</em>) of 9.41 MRayl, indicating efficient energy conversion and favorable acoustic matching. The composite sustains a maximum tensile load close to 20 N and endures 400 cycles under a 5 N cyclic load without performance degradation. Resonance characteristics remain stable from 20°C to 60°C, showing strong fatigue and thermal stability for long-term wearable use. The fabricated arrays display high inter-element uniformity, with relative mean deviation (RMD) below 1 % and maximum deviation ratio (MDR) below 3 %. These results confirm the 2-1-2 composite as a promising material platform for conformal ultrasonic imaging and wearable therapeutic ultrasound systems.</div></div>","PeriodicalId":34525,"journal":{"name":"Composites Part C Open Access","volume":"19 ","pages":"Article 100709"},"PeriodicalIF":7.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146187378","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}