Composite Structures最新文献

Thermal expansion behaviour of short-fibre-reinforced 3D-printed composites: A numerical and experimental study 短纤维增强3d打印复合材料的热膨胀行为：数值和实验研究

IF 7.1 2区材料科学

Composite Structures Pub Date : 2026-05-01 Epub Date: 2026-02-05 DOI: 10.1016/j.compstruct.2026.120130

Yuheng Zhou, Farimah Tikhani, Pascal Hubert

{"title":"Thermal expansion behaviour of short-fibre-reinforced 3D-printed composites: A numerical and experimental study","authors":"Yuheng Zhou, Farimah Tikhani, Pascal Hubert","doi":"10.1016/j.compstruct.2026.120130","DOIUrl":"10.1016/j.compstruct.2026.120130","url":null,"abstract":"<div><div>The thermal expansion behaviour of short-fibre-reinforced 3D-printed (SFR 3DP) composites has been studied primarily through analytical models focusing on the longitudinal direction, whereas the transverse behaviour has received limited attention. In addition, full-field finite element (FE) modelling of thermal expansion in SFR 3DP composites remains relatively uncommon. In this study, the coefficient of thermal expansion (CTE) of SFR 3DP composites, specifically polycarbonate with various levels of glass fibre reinforcement, is predicted using five analytical models (Turner, Kerner, Schapery, No-Interaction (NI), and Mori–Tanaka (MT)) alongside full-field FE models, and the results are compared with thermo-mechanical analysis (TMA) data in both longitudinal and transverse directions. In the longitudinal direction, the Schapery model is most accurate at low fibre contents, the MT model at higher contents, while the FE model remains highly accurate across the entire range. In the transverse direction, the MT model provides virtually identical accuracy to the FE model at every fibre content. Overall, the analytical approaches can match the predictive power of full-field FE modelling for CTE of SFR 3DP composites. Longitudinally, the FE method remains the more general tool, whereas the accuracy of analytical models is more sensitive to fibre content. Transversely, both approaches perform equally well.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"383 ","pages":"Article 120130"},"PeriodicalIF":7.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146186427","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}

引用次数: 0

The role of steel fibers in the bond behavior of CFRP-UHPFRC joints: A mesoscale finite element study 钢纤维在CFRP-UHPFRC接头粘结行为中的作用：中尺度有限元研究

IF 7.1 2区材料科学

Composite Structures Pub Date : 2026-05-01 Epub Date: 2026-02-08 DOI: 10.1016/j.compstruct.2026.120143

Yaqi Li , Zhenjun Yang , Xin Zhang , Songbo Wang , Yu Su

{"title":"The role of steel fibers in the bond behavior of CFRP-UHPFRC joints: A mesoscale finite element study","authors":"Yaqi Li , Zhenjun Yang , Xin Zhang , Songbo Wang , Yu Su","doi":"10.1016/j.compstruct.2026.120143","DOIUrl":"10.1016/j.compstruct.2026.120143","url":null,"abstract":"<div><div>This study investigates the influence of steel fibers on the bond performance between ultra high performance fiber reinforced concrete (UHPFRC) and adhesively bonded carbon fiber reinforced polymer (CFRP) laminates through mesoscale finite element (FE) modelling. The models incorporate randomly distributed elastoplastic beam elements to simulate the fibers, the nonlinear cohesive elements to simulate the fiber-mortar interfaces, and the concrete damage plasticity model to simulate the mortar, so that all the main failure mechanisms including fiber bending, sliding, pull-out, rupture, mortar cracking and fiber-mortar interfacial debonding can be modelled. The simulated results were first validated against 10 single shear pull-off tests of CFRP-UHPFRC bonded joints. The results indicated that adding steel fibers altered the failure mode from substrate splitting to CFRP debonding and enhanced the bond strength by 4–28%, although adding fibers beyond 2% led to marginal increases. Extensive mesoscale parametric simulations were then conducted, identifying the mortar tensile strength and the fiber orientation as the most effective factors in enhancing both the bond strength and the ductility. Based on the simulation results, a semi-analytical model was proposed to predict the bond strength of CFRP-UHPFRC joints, which extended the Chen and Teng’s model by incorporating a fiber influence coefficient.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"383 ","pages":"Article 120143"},"PeriodicalIF":7.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146186782","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}

引用次数: 0

Thermal stress concentration in thermoelectric material induced by a smooth inhomogeneity 光滑非均匀性引起的热电材料热应力集中

IF 7.1 2区材料科学

Composite Structures Pub Date : 2026-05-01 Epub Date: 2026-04-23 DOI: 10.1016/j.compstruct.2026.120372

Zhaohang Lee, Wennan Zou

{"title":"Thermal stress concentration in thermoelectric material induced by a smooth inhomogeneity","authors":"Zhaohang Lee, Wennan Zou","doi":"10.1016/j.compstruct.2026.120372","DOIUrl":"10.1016/j.compstruct.2026.120372","url":null,"abstract":"<div><div>Thermal stress concentration in thermoelectric materials, induced by multiphysical field perturbations due to inherent inhomogeneities, is a primary driver of premature failure during service. A key bottleneck in modeling inhomogeneity system is the lack of an explicitly available solution. Motivated by this, the present work investigates the two-dimensional electro-thermo-elastic coupling problem of a smooth inhomogeneity characterized by a Laurent polynomial and embedded in a thermoelectric material subjected to uniform electric current density or uniform energy flux at infinity. The boundary conditions of electrical insulation, adiabatic behavior, and perfect mechanical bonding are considered. Within the framework of complex variable theory, once the explicit solutions for the electric and temperature fields are obtained, the elastic field can be solved via a newly developed iterative strategy. This approach decomposes the boundary value problem into a sequence of exactly solvable Riemann-Hilbert problems, which yields an explicit expression for the elastic field in terms of Faber polynomials and their associated polynomials. Numerical analyses for elliptical and polygonal inhomogeneities demonstrate that stress concentration predominantly occurs on the matrix side of the boundary, with its intensity governed by the loading direction, shear modulus ratio, and inhomogeneity shape. In addition, the maximum curvature of the inhomogeneity boundary can serve as an effective geometric indicator for evaluating the severity of stress concentration.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"388 ","pages":"Article 120372"},"PeriodicalIF":7.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147804744","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}

引用次数: 0

Accurate burst pressure prediction of filament-wound composite casings via a multiscale inhomogeneous stiffness-driven model 基于多尺度非均匀刚度驱动模型的细丝缠绕复合材料套管爆裂压力精确预测

IF 7.1 2区材料科学

Composite Structures Pub Date : 2026-05-01 Epub Date: 2026-01-24 DOI: 10.1016/j.compstruct.2026.120060

Xing Mou, Qian Zhang, Guiming Zhang, Qiaoguo Wu, Jianhui Fu, Lichuan Zhou, Helin Pan, Lei Zu

{"title":"Accurate burst pressure prediction of filament-wound composite casings via a multiscale inhomogeneous stiffness-driven model","authors":"Xing Mou, Qian Zhang, Guiming Zhang, Qiaoguo Wu, Jianhui Fu, Lichuan Zhou, Helin Pan, Lei Zu","doi":"10.1016/j.compstruct.2026.120060","DOIUrl":"10.1016/j.compstruct.2026.120060","url":null,"abstract":"<div><div>The burst pressure prediction error for composite casing domes exceeded 20% when using the traditional homogeneous stiffness model (THSM), particularly in structures with large openings. This is primarily because the THSM neglects the pronounced heterogeneity in fiber volume fraction (FVF) and cannot adequately capture the complex failure modes in the composite casing dome region (CCDR). To overcome this limitation, an inhomogeneous stiffness-driven model (ISDM) was developed in this study, incorporating a multiscale modeling approach based on spatially variable FVF determined using 3D scanning reconstruction technology and the no-fiber-flux-change principle (NFFCP). The ISDM enables detailed analysis of stress distribution, damage initiation, and failure evolution by considering local stiffness variations within the CCDR. Compared to the THSM, the ISDM demonstrates significantly improved agreement with experimental stress–strain data and accurately captures the progressive failure modes observed in burst tests. The simulation results reveal that the FVF distribution strongly impacts localized stiffness, stress concentrations, and damage propagation paths, and the ISDM achieves a burst pressure prediction error of less than 3.0%, substantially outperforming the THSM. This research highlights the critical role of microstructural inhomogeneity in determining composite casing performance and introduces a precise and robust method for burst pressure prediction and failure analysis in filament-wound composite structures.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"383 ","pages":"Article 120060"},"PeriodicalIF":7.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146186772","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}

引用次数: 0

Thermo-mechanical performance of functionally graded metal rubber: Modeling and experimental characterization 功能梯度金属橡胶的热机械性能：建模与实验表征

IF 7.1 2区材料科学

Composite Structures Pub Date : 2026-05-01 Epub Date: 2026-04-26 DOI: 10.1016/j.compstruct.2026.120380

Yuhan Wei , Fang Yang , Liang Wang , Zhiying Ren , Yanpeng Yang , Xin Xue , Juan Liao

{"title":"Thermo-mechanical performance of functionally graded metal rubber: Modeling and experimental characterization","authors":"Yuhan Wei , Fang Yang , Liang Wang , Zhiying Ren , Yanpeng Yang , Xin Xue , Juan Liao","doi":"10.1016/j.compstruct.2026.120380","DOIUrl":"10.1016/j.compstruct.2026.120380","url":null,"abstract":"<div><div>As a novel functional material, the functionally graded metal rubber (FGMR) integrates a hierarchical architecture with a spatially varying density gradient, offering tunable thermal mechanical properties. However, the influence of external temperature on thermal behavior of FGMR remains unclear. To address this issue, an effective thermal transfer model is established and correlated with the thermal compression response to elucidate the coupling effect between thermal and mechanical behavior. Moreover, the gradient equation of FGMR is quantitatively extracted from computed tomography (CT) images to accurately characterize the density distribution. The results demonstrate that the proposed models for FGMR effectively capture the interplay between gradient architecture and deformation behavior. The predicted results based on temperature calculated by heat conductivity are more accurate than those using environment temperature. This work provides a quantitative framework for linking gradient architecture to thermal mechanical properties in porous metallic systems, offering guidance for the design and optimization of graded porous materials in thermal protection and energy dissipation applications.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"388 ","pages":"Article 120380"},"PeriodicalIF":7.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147804742","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}

引用次数: 0

Research on dynamic mechanical behaviors and energy absorption characteristics of ceramsite-based foamed concrete composite 陶粒基泡沫混凝土复合材料动态力学行为及吸能特性研究

IF 7.1 2区材料科学

Composite Structures Pub Date : 2026-05-01 Epub Date: 2026-01-30 DOI: 10.1016/j.compstruct.2026.120087

Xiaohan Shi , Linlin Gu , Zhen Wang , Zirui Cheng , Junke Yang , Guokai Zhang , Fei Gao

{"title":"Research on dynamic mechanical behaviors and energy absorption characteristics of ceramsite-based foamed concrete composite","authors":"Xiaohan Shi , Linlin Gu , Zhen Wang , Zirui Cheng , Junke Yang , Guokai Zhang , Fei Gao","doi":"10.1016/j.compstruct.2026.120087","DOIUrl":"10.1016/j.compstruct.2026.120087","url":null,"abstract":"<div><div>As a new type of porous material, ceramsite-based foamed concrete composite (CFC) has been widely used in protection and other industries in recent years. To investigate the dynamic mechanical behavior, damage characteristics and energy absorption characteristics of CFC under impact loading, impact tests with strain rate of 115 s<sup>−1</sup>∼200 s<sup>−1</sup> were carried out on CFC with different density and ceramsite content using separated Hopkinson pressure rod device (SHPB), and compared with a density grade of foam concrete (FC). A comprehensive comparative analysis was performed on the dynamic failure processes, damage characteristics, stress–strain responses, peak stresses, energy evolution, and fracture morphologies of the two materials. In addition, synchronized high speed imaging, scanning electron microscopy (SEM), and CT scanning were employed to further characterize the dynamic impact failure process and the microstructural features of CFC. The experimental results indicate that the incorporation of ceramsite lightweight aggregates into foamed concrete can increase the peak stress by 151% and the energy absorption density by 211%. Among all specimens, CFC800-50 exhibits the highest energy absorption density, reaching up to 1.60 MJ/m<sup>3</sup>. In practical engineering applications, CFC can achieve a balance between compressive load bearing capacity and energy absorption performance, making it well suited for protective structures dominated by explosion and impact loads.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"383 ","pages":"Article 120087"},"PeriodicalIF":7.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146186448","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}

引用次数: 0

From static properties to fatigue life: comprehensive evaluation of unidirectional and woven flax fiber composites for structural applications 从静态性能到疲劳寿命：结构用单向和编织亚麻纤维复合材料的综合评价

IF 7.1 2区材料科学

Composite Structures Pub Date : 2026-05-01 Epub Date: 2026-02-07 DOI: 10.1016/j.compstruct.2026.120121

Paladugu Rakesh , Ujendra Kumar Komal , Nelson Muthu

{"title":"From static properties to fatigue life: comprehensive evaluation of unidirectional and woven flax fiber composites for structural applications","authors":"Paladugu Rakesh , Ujendra Kumar Komal , Nelson Muthu","doi":"10.1016/j.compstruct.2026.120121","DOIUrl":"10.1016/j.compstruct.2026.120121","url":null,"abstract":"<div><div>The present study examines the structural integrity of flax/epoxy composites. Two laminate configurations, a unidirectional (UD) laminate and a woven bidirectional (BD) laminate, were fabricated using the VARTM process. The composites were characterized to evaluate their thermal, mechanical, and fatigue behaviour for structural applications. The crystallinity index obtained from XRD confirmed structural stability. Thermal analyses using TGA and DMA demonstrated that the composites can safely retain stiffness up to 50 °C, and the DMA frequency sweep showed negligible frequency dependence up to 20 Hz. Static tensile, flexural, and fatigue tests were conducted, and the results were normalized with respect to the fibre volume fraction along the loading direction. Tensile tests on the woven laminate were performed in both warp and weft directions, showing minimal directional dependence. Both laminates exhibited good fatigue resistance at 50 % of their ultimate stress levels. S-N curves were established, and a semi-logarithmic model provided the best fit to fatigue life. Stiffness degradation was quantified; in the UD laminate, a staircase-like stiffness reduction was observed during stage II degradation. Examination of fractured surfaces from tensile and fatigue specimens revealed fibre pull-out and matrix cracking in the off-axis direction as the dominant failure modes, along with striations in the fatigue-tested specimens.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"383 ","pages":"Article 120121"},"PeriodicalIF":7.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146186767","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}

引用次数: 0

Analysis of magneto-mechanical coupling model and dynamic deformation characteristics of flexible magnetostrictive ribbon films considering fiber structure 考虑纤维结构的柔性磁致伸缩带膜磁-力耦合模型及动态变形特性分析

IF 7.1 2区材料科学

Composite Structures Pub Date : 2026-05-01 Epub Date: 2026-01-29 DOI: 10.1016/j.compstruct.2026.120110

Luyao Zhao , Huifang Liu , Jiaqi Wang , Yifei Gao , Chunye Hou , Cheng Li

{"title":"Analysis of magneto-mechanical coupling model and dynamic deformation characteristics of flexible magnetostrictive ribbon films considering fiber structure","authors":"Luyao Zhao , Huifang Liu , Jiaqi Wang , Yifei Gao , Chunye Hou , Cheng Li","doi":"10.1016/j.compstruct.2026.120110","DOIUrl":"10.1016/j.compstruct.2026.120110","url":null,"abstract":"<div><div>To address the growing demand for magnetostrictive micro-nano structural materials that exhibit both high performance and flexibility, it is essential to analyze and design the dynamic driving characteristics of magnetostrictive fiber ribbon film, which is crucial for further enhancing its working capability. This paper innovatively presents a state-space model to characterize the dynamic magnetostrictive deformation of fiber ribbon films with various structural parameters under applied magnetic fields. For the first time, fiber structure is explicitly incorporated into the description of its electro-magnetic-mechanical dynamic behavior. Phase trajectory analysis reveals the stability boundary during the driving process, and time-domain characteristics under different magnetic fields are simulated. The results indicate that magnetostrictive performance improves with increasing driving current, leading to bifurcation behavior at the critical current of 0.9A. At this time, the film exhibits bistable characteristics, repeatedly transitioning between two stable equilibrium positions. This motion enables the accumulation and release of energy through potential well crossing, thus achieving large magnetostrictive deformation output. Finally, the output characteristics under varying frequencies and amplitudes of driving current are evaluated, with a maximum deformation of 208 μm under combined 3.1A bias and alternating current excitation. These findings provide a theoretical basis for designing high-output flexible magnetoelectric transducers.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"383 ","pages":"Article 120110"},"PeriodicalIF":7.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146102471","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}

引用次数: 0

Experimental investigation on mechanical behavior of grout-filled pultruded FRP multi-cavity profiles 注浆填充玻璃钢多腔型材力学性能试验研究

IF 7.1 2区材料科学

Composite Structures Pub Date : 2026-05-01 Epub Date: 2026-04-23 DOI: 10.1016/j.compstruct.2026.120369

Hu Feng, Shenghao Lu, Xiaoli Wei, Xuhui Geng, Chang Su, Yuyang Pang

{"title":"Experimental investigation on mechanical behavior of grout-filled pultruded FRP multi-cavity profiles","authors":"Hu Feng, Shenghao Lu, Xiaoli Wei, Xuhui Geng, Chang Su, Yuyang Pang","doi":"10.1016/j.compstruct.2026.120369","DOIUrl":"10.1016/j.compstruct.2026.120369","url":null,"abstract":"<div><div>FRP (Fiber Reinforced Polymer) are ideal materials for improving the strength and ductility of existing concrete structures, but its susceptibility to buckling limit its use in compression-bearing part. In this work, a particular kind of composite member is developed by grouting into the pultruded FRP multi-cavity profile. The internal grouting material is used to ensure compressive stability while the external FRP profile is used to provide high tensile strength and a degree of confinement to the internal grout. Ten FRP profiles are designed, and the mechanical performances of two-cavity and three-cavity grout-filled pultruded FRP profiles are experimentally investigated. The testing results show that the type of fiber, the direction of fabric mesh and the content of fiber have an influence on the tensile properties of the profile sheet. Compared to the two-cavity profile, the three-cavity grout-filled FRP profile has higher compressive strength. The three-cavity grout-filled FRP profile with the combination of the outer two layers of ± 45° glass fiber fabric and the inner one layer of ± 45° glass fiber fabric has the best compressive performance. The calculation formulas of tensile and compressive bearing capacity are proposed, the confinement effect of multi-cavity FRP profiles is quantified by a confinement enhancement coefficient.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"388 ","pages":"Article 120369"},"PeriodicalIF":7.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147804740","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}

引用次数: 0

Experimental investigation of concrete columns strengthened with perforated internal carbon fiber reinforced polymer tubes 内孔碳纤维增强聚合物管加固混凝土柱的试验研究

IF 7.1 2区材料科学

Composite Structures Pub Date : 2026-05-01 Epub Date: 2026-01-28 DOI: 10.1016/j.compstruct.2026.120114

Krzysztof Adam Ostrowski , Marcin Piechaczek , Oliwia Sikora

{"title":"Experimental investigation of concrete columns strengthened with perforated internal carbon fiber reinforced polymer tubes","authors":"Krzysztof Adam Ostrowski , Marcin Piechaczek , Oliwia Sikora","doi":"10.1016/j.compstruct.2026.120114","DOIUrl":"10.1016/j.compstruct.2026.120114","url":null,"abstract":"<div><div>Fiber-reinforced polymer (FRP) composites have attracted significant attention in the strengthening of concrete structures because of their high mechanical efficiency and long-term durability relative to conventional materials. This study investigates a novel hybrid method of reinforcing self-compacting concrete (SCC) columns using internally placed perforated CFRP tubes and external CFRP confinement, also serves as lost formwork.</div><div>Axial compression tests were conducted to evaluate mechanical behavior, focusing on compressive strength, deformability, and stiffness. Four configurations were tested: unconfined specimens, internal-only reinforcement (I-series), external-only confinement (O-series), and combined internal-external reinforcement (hybrid O-1/I-1 and O-3/I-1). Holes (2.8 % surface area) were made in the CFRP tubes to improve the bond between core concrete and the external jacket.</div><div>The hybrid system (O-3/I-1) achieved the highest performance, increasing compressive strength by 104 % and deformability by 50 % compared to unconfined specimens. External confinement alone resulted in an 82 % strength increase and improved stiffness, while internal strengthening contributed to a 12–15 % increase in strength and provided sustained load-bearing capacity even after outer concrete cover had failed.</div><div>Analytical comparisons confirmed compatibility of test results with theoretical models. The findings highlight effectiveness of this composite technique for structural applications such as bridge piers and high-rise columns. Further research is recommended on factors like perforation geometry and column slenderness.</div></div>","PeriodicalId":281,"journal":{"name":"Composite Structures","volume":"383 ","pages":"Article 120114"},"PeriodicalIF":7.1,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146186780","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}

引用次数: 0