Composites Part A: Applied Science and Manufacturing最新文献

{"title":"Effect of automated tape placement pass frequency on matrix-dominated mechanical properties and microstructure of wound CF/PEEK","authors":"E. Tobin ,&nbsp;H. Ma ,&nbsp;R.M. O’Higgins ,&nbsp;P.M. Weaver","doi":"10.1016/j.compositesa.2025.108901","DOIUrl":"10.1016/j.compositesa.2025.108901","url":null,"abstract":"<div><div>Matrix-dominated properties, including Interlaminar Shear Strength, of carbon fibre/PEEK laminates manufactured by laser-assisted automated tape placement are highly influenced by processing parameters selected during manufacturing. In this study, both experimental analysis and a simulation of the thermal characteristics during manufacturing were utilised to determine the influence of processing parameters and laser pass frequency on the quality of the manufactured component. Two cylindrical mandrels with different diameters were used to vary the pass frequency along with various placement rates. While it was determined through mechanical simulations that the geometry of the mandrel did not cause subsequent variations in matrix-dominated mechanical properties, mechanical testing contradicted this finding. Increasing the pass frequency was determined to reduce the void content and increase the Interlaminar Shear Strength. Increasing pass frequency resulted in the substrate temperature remaining near the glass transition temperature for the matrix, with similar effects achieved to that of a heated tool, facilitating further void compaction and increasing the Interlaminar Shear Strength.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"194 ","pages":"Article 108901"},"PeriodicalIF":8.1,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Direct Ink Writing of ATZ composites toughened with in-situ grown strontium hexaluminate platelets","authors":"Manuel F.R.P. Alves,&nbsp;Narciso R.M. Lévaro,&nbsp;M.S. Faria,&nbsp;Susana M. Olhero","doi":"10.1016/j.compositesa.2025.108906","DOIUrl":"10.1016/j.compositesa.2025.108906","url":null,"abstract":"<div><div>In the present work, dense and tough alumina toughened zirconia (ATZ) composites reinforced with strontium hexaluminate platelets (S6A) were developed by Direct Ink Writing. To avoid the issues related with the direct addition of high aspect ratio particles, the S6A platelets were grown <em>in situ</em> during the sintering step. The influence of the S6A precursor addition on the printability of the ATZ paste and subsequently on the densification, microstructure and mechanical properties of the printed parts were studied. Proper printability was attained for pastes with 40 vol% of solids in the presence of different amounts of S6A precursors. Good dispersibility of the S6A platelets was observed in the sintered microstructures, for all considered concentrations (2.5, 5 and 7.5 vol%). Samples reinforced with S6A platelets exhibited densities around 98–99 %, while the best trade-off between flexural strength (768 MPa), fracture toughness (8.5 MPa√m) and hardness (14.3 GPa) was attained for the ATZ containing 5 vol% of S6A.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"194 ","pages":"Article 108906"},"PeriodicalIF":8.1,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Synergistic improvement of toughness and thermal properties of phthalonitrile resin based on the multiple curing mechanism of amino-carborane","authors":"Zichun Ding ,&nbsp;Jianjian Jiao ,&nbsp;Yuhang Wang,&nbsp;Runze Liu,&nbsp;Qing Wang,&nbsp;Jianing Guo,&nbsp;Siying Wang,&nbsp;Lishuai Zong,&nbsp;Xigao Jian,&nbsp;Jinyan Wang","doi":"10.1016/j.compositesa.2025.108903","DOIUrl":"10.1016/j.compositesa.2025.108903","url":null,"abstract":"<div><div>Ultra heat-resistant phthalonitrile resin has faced serious challenges of the trade-off between temperature resistance and toughness and seriously affects its application in the field of temperature resistant structural composites. In this work, a kind of oligo (aryl ethers) containing phenyl-s-triazine and pendent amino group (AFT-Ph/PAFT-Ph) were first selected as modifier co-cured with phthalonitrile prepolymers containing a carborane (CEPN) to achieve synergistic improvement in toughness and heat resistance performance. The flexural and impact strengths of optimized composites reach 278.6 MPa and 58.4 kJ/m², which are increased by 92.7 % and 1091.8 % compared to the blank contrast. The glass transition temperature (<em>T_g</em>) remained consistent with that of the blank control group, both exceeding 550 ℃. Furthermore, the <em>T_d5%–N₂</em> shows a marginal increase from 706 ℃ in the blank contrast to 713 ℃ in the modified material. Simultaneously conducting research on the mechanism of collaborative improvement mentioned above.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"194 ","pages":"Article 108903"},"PeriodicalIF":8.1,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Homogenous nanofiber skeleton-reinforced shape memory polyimide aerogel composites with high deformability and rapid recovery","authors":"Yufan Zhang,&nbsp;Xiang Wang,&nbsp;Minhao Guo,&nbsp;Le Li,&nbsp;Tianxi Liu","doi":"10.1016/j.compositesa.2025.108907","DOIUrl":"10.1016/j.compositesa.2025.108907","url":null,"abstract":"<div><div>Shape memory polymer aerogels have garnered significant attention for intelligent applications, yet their practical implementation remains constrained by inadequate deformation tolerance and sluggish recovery kinetics. To address these challenges, we present a homogeneous reinforcement strategy for constructing polyimide aerogel composites reinforced with an interpenetrating nanofiber skeleton. Through precise regulation of hierarchical pore architecture, strong interface interactions, and enhanced recovery stress, the engineered aerogel composite demonstrates remarkable enhancements in both structural and functional properties. The optimized aerogel composite exhibits exceptional thermal stability, superior deformation tolerance, and fast shape recovery response. Particularly noteworthy is its unprecedented shape recovery capability, enabling it to reliably and fully recover from complex and large deformations within 5 s. This advancement not only establishes a new paradigm for designing high-performance shape memory polymer aerogels but also significantly expands their potential utilization in cutting-edge technological applications.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"194 ","pages":"Article 108907"},"PeriodicalIF":8.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143783811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Glass fiber-reinforced epoxy composites with high thermal conductivity, flame retardancy and mechanical strength","authors":"Ze-Tao Xiao ,&nbsp;Hao-Jie Shi ,&nbsp;Wei Wang ,&nbsp;Qun Liu ,&nbsp;Yu Li ,&nbsp;Yuan Hu ,&nbsp;Xin Wang","doi":"10.1016/j.compositesa.2025.108905","DOIUrl":"10.1016/j.compositesa.2025.108905","url":null,"abstract":"<div><div>Fiber-reinforced epoxy resins (FREPs) have shown broad application prospects because of their excellent comprehensive properties, but their poor thermal conductivity and lack of flame retardancy also restrict their usage in many fields. To solve these problems, DOPO-GL-DCDA was selected as a flame retardant, tannic acid-modified BN and Al₂O₃ were selected as fillers to improve the thermal conductivity of the epoxy thermosets simultaneously, and glass fiber-reinforced epoxy composites (GFREPs) were subsequently prepared by combining an epoxy-filler system with glass fibers (GFs) or modified glass fibers (mGFs). The obtained GFREP revealed excellent comprehensive properties, including flame retardancy, thermal conductivity and mechanical properties. Specifically, the thermal conductivities of EP/40 %(Al₂O₃ + BN)/GF and EP/40 %(Al₂O₃ + BN)/mGF were 0.638 and 0.609 W·m⁻¹·K⁻¹, respectively. Additionally, EP/40 %(Al₂O₃ + BN)/mGF had an LOI of 56.0 % and a V-0 rating in the UL-94 vertical burning test. Compared with those of EP, the heat release rate (HRR), total heat release (THR) and total smoke production (TSP) of EP/40 %(Al₂O₃ + BN)/mGF were reduced by 90.9 %, 90.6 % and 80.2 %, respectively. Moreover, the mechanical properties, including the tensile and impact strengths, of EP/40 %(Al₂O₃ + BN)/mGF reached 239.2 MPa and 77.4 kJ/m², respectively. In summary, the prepared GFREP combines a series of excellent comprehensive properties with the maintenance of low dielectric loss, which shows wide potential in electronic and electrical applications.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"194 ","pages":"Article 108905"},"PeriodicalIF":8.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and manufacturing of bio-inspired functionally graded ceramic-reinforced resin post-and-core restorations","authors":"Jiaojiao Yun ,&nbsp;Ruihan Ge ,&nbsp;James K.H. Tsoi ,&nbsp;Yu Lu ,&nbsp;Shuangzhuang Guo ,&nbsp;Jiawen Guo ,&nbsp;Yan Wang","doi":"10.1016/j.compositesa.2025.108889","DOIUrl":"10.1016/j.compositesa.2025.108889","url":null,"abstract":"<div><div>This study developed a functionally graded post-and-core system using urethane dimethacrylate resins reinforced with zirconia (ZrO₂) nanoparticles, with material design guided by finite element (FE) modeling. Three groups were established according to the post-and-core materials and techniques: FPC, prefabricated fiber post plus resin composite core; HPC, CAD/CAM homogeneous post-and-core; GPC, CAD/CAM graded post-and-core. The machinability assessment validated the dimensional accuracy of experimental CAD/CAM posts by showing an undetectable marginal discrepancy of less than 40 µm and the good adhesion between the sequentially deposited layers for graded post-and-core. FE analysis and <em>in vitro</em> failure test were performed to compare the biomechanical performance of the restored teeth using three restorations. FE analysis indicated that the GPC group with tri-layer configuration (coronal–apical dimensions: 6–4–3 mm) and corresponding elastic modulus (9.8–8.5–6.7 GPa) achieved optimal stress distribution patterns, outperforming both FPC and HPC groups. <em>In vitro</em> tests revealed that both GPC and HPC groups possessed uniform adhesive layers and favorable root repairable failure rates of 33 %, significantly higher than the rate of 0 % observed in FPC group. This functionally graded approach effectively addresses the biomechanical mismatch along the corono-apical direction of tooth roots by tailoring material properties, offering a strategy for the next-generation post-and-core restorations. The successful development of CAD/CAM graded composites demonstrates significant potential for advanced restorative applications with good clinical performance.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"194 ","pages":"Article 108889"},"PeriodicalIF":8.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143823581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Regulating SiO2 interlayer morphology towards synergistically reinforced dielectric properties and thermal conductivity in Si/PVDF composites","authors":"Mengyuan Zhang ,&nbsp;Wenying Zhou ,&nbsp;Yanqing Zhang ,&nbsp;Fanrong Kong ,&nbsp;Xiaolong Chen ,&nbsp;Fang Wang ,&nbsp;Jian Zheng ,&nbsp;Shaolong Zhong","doi":"10.1016/j.compositesa.2025.108893","DOIUrl":"10.1016/j.compositesa.2025.108893","url":null,"abstract":"<div><div>Polymeric composites integrating large dielectric constant (<em>ε</em>), minimal loss with elevated breakdown strength (<em>E</em>_b) and thermal conductivity (TC), exhibit concern in electrical and power industry. To enhance the TC and <em>E</em>_b while suppressing loss in silicon (Si)/poly (vinylidene fluoride, PVDF), the Si@silica (SiO₂) was prepared by high-temperature oxidation, and subsequently doped into PVDF. The Si@SiO₂/PVDF displays lower loss since the SiO₂ layer prevents direct contact between Si particles， inhibiting long-distance electron migration. Moreover, the SiO₂ introduces traps to immobilize charge carriers, elevating the <em>E</em>_b. In particular, changing the amorphous SiO₂ shell to crystalline one accelerates phonon transport, leading to enhanced TC. The dielectric parameters and TC of the Si@SiO₂/PVDF can be synergistically tuned by adjusting the SiO₂′ morphology and thickness. The theoretical calculation uncovers the underlying mechanisms for both charge and phonon transport in the composites. This developed Si@SiO₂/PVDF composites with excellent dielectric performances and large TC showcase widespread applications.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"194 ","pages":"Article 108893"},"PeriodicalIF":8.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Porosity evolution in additively manufactured compression molded short fiber thermoplastics under cyclic loading: Insights from micro-computed tomography and infrared thermography","authors":"Pharindra Pathak,&nbsp;Suhasini Gururaja","doi":"10.1016/j.compositesa.2025.108881","DOIUrl":"10.1016/j.compositesa.2025.108881","url":null,"abstract":"<div><div>Composite structures, integral to lightweight, high-performance applications, often suffer from premature fatigue failure due to process-induced defects such as porosity. The recently developed additive manufacturing and compression molding (AM-CM) process enables short fiber thermoplastics (SFTs) with greater fiber orientational control and low porosity. However, the existing pores in SFTs act as fatigue damage initiators, emphasizing the need for a better understanding of the effect of pores on the fatigue behavior of SFTs.</div><div>In this study, process defects in 20 wt% carbon fiber reinforced acrylonitrile butadiene styrene (C/ABS) SFTs produced through AM-CM were first identified using ultrasonic inspection and analyzed in detail via micro-computed tomography (<span><math><mi>μ</mi></math></span>-CT). A rapid fatigue testing approach was employed to characterize the cyclic degradation of SFTs, utilizing infrared thermography (IRT) to measure surface temperature changes induced by self-heating, combined with a staircase cyclic loading profile. Porosity evolution in AM-SFTs under cyclic loading was tracked by interrupting the test before the expected fatigue and post-fatigue limits for a precise correlation between defect progression and fatigue performance. The findings demonstrate that increased porosity significantly reduces fatigue resistance, while <span><math><mi>μ</mi></math></span>-CT reveals clustering near fiber ends and within fiber-rich zones as critical contributors to damage initiation. Numerical homogenization, incorporating <span><math><mi>μ</mi></math></span>-CT fiber and pore statistical data within an octree-based algorithm for microstructure generation, validated the experimental observations and provided insights into effective property degradation. This study establishes a robust framework for characterizing fatigue behavior in SFT composites, offering significant potential for improving predictive models and optimizing manufacturing processes to mitigate defects and enhance performance.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"194 ","pages":"Article 108881"},"PeriodicalIF":8.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143799706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simultaneous enhancement of mechanical robustness and self-sensing performance in fly ash-based geopolymer nanocomposites","authors":"Hailong Hu ,&nbsp;Yefan Liu ,&nbsp;Lei Chen ,&nbsp;Fan Zhang","doi":"10.1016/j.compositesa.2025.108894","DOIUrl":"10.1016/j.compositesa.2025.108894","url":null,"abstract":"<div><div>The simultaneous enhancement of both mechanical robustness and self-sensing capabilities in geopolymer nanocomposites significantly advances the precision and dependability of structural health monitoring systems. In this study, the uniform dispersion of graphene nanoplatelets (GNPs) within fly ash-based geopolymer composites is successfully achieved through the in-situ chemical synthesis of a silica (SiO₂) coating on the GNP surface. The resulting composite material exhibits a significant enhancement in sensitivity, which is attributed to the presence of the SiO₂ coating on the GNPs. In comparison to uncoated GNP/geopolymer composites, varying the concentration of the precursor tetraethyl orthosilicate (TEOS) from 0 to 8 ml enables the formation of SiO₂ coatings with different thicknesses, which effectively modulates the resistivity of the composite to meet specific sensing application requirements. The self-sensing sensitivity of the composite shows a considerable increase of 479.7 %, accompanied by a concurrent 89.1 % increase in elastic modulus. Notably, the gauge factor (GF) of geopolymer composites reached up to 491, which surpasses the results reported in recent literatures. The underlying mechanism suggests the in-situ SiO₂ coating significantly enhances the composite’s sensitivity and mechanical properties by improving the interface bonding between GNP and the geopolymer matrix, acting as a dielectric layer to reduce direct contact and particle agglomeration, and exhibiting excellent chemical and thermal stability. This advancement holds paramount importance in mitigating risks associated with structural failures, prolonging the operational lifespan of critical infrastructure, and ultimately improving public safety standards.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"194 ","pages":"Article 108894"},"PeriodicalIF":8.1,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143769169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On residual tensile strength after lightning strikes","authors":"X. Xu ,&nbsp;S.L.J. Millen ,&nbsp;D. Mitchard ,&nbsp;M.R. Wisnom","doi":"10.1016/j.compositesa.2025.108899","DOIUrl":"10.1016/j.compositesa.2025.108899","url":null,"abstract":"<div><div>The study of post lightning strike residual strength is still relatively underdeveloped in the literature. Different approaches including in-plane compression or flexural testing have been used, but in-plane tensile loading post-strike has not been studied in detail. Although previous attempts have been made to determine the residual strength using Compression-After-Lightning (CAL) tests on composite laminates, these have been limited and not readily applicable under tensile loads. Therefore, this work completes Tension-After-Lightning (TAL) testing at 75 kA on composite laminates, a more realistic peak current than previously reported for TAL tests, to assess the knock-down in strength post-strike. The measured average TAL failure stress was 716 MPa, a reduction of 23 % from the baseline tensile failure stress of 929 MPa in the literature. This confirms a similar knock-down factor reported at lower peak currents (e.g. 50 kA), but the new TAL specimen geometry ensures that the lightning damage is contained within both the lightning and TAL specimen widths. In addition, a new Finite Element (FE) based virtual test was conducted, considering 0° ply splitting, and validated with the TAL tests herein. The TAL simulation predicted the residual tensile failure stress well, within 6 % of the measured value.</div></div>","PeriodicalId":282,"journal":{"name":"Composites Part A: Applied Science and Manufacturing","volume":"194 ","pages":"Article 108899"},"PeriodicalIF":8.1,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}