Composites Part C Open Access最新文献_第3页

Laser based surface texturing and PA6 powder interlayering for joining enhancement of DP600/PA6GF47 hybrid joints via induction welding 激光表面织构和PA6粉末夹层增强DP600/PA6GF47混合接头的感应焊连接

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2026-01-01 DOI: 10.1016/j.jcomc.2025.100693

K. Boukhadra , Z. Jendli , J-C. Walrick , R. Zouaghi , A. Kouadri-Henni

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.

采用激光表面微织构与PA6粉末间层相结合的方法提高DP600钢/PA6GF47热塑性复合材料复合接头的感应焊连接性能。评估了四种连接条件：无纹理-无粉末（NT-NP）、无纹理-无粉末（NT-P）、纹理-无粉末（T-NP）和纹理-粉末（T-P）。通过优化激光变形参数，在DP600钢表面形成深度均匀、周期均匀的可控微槽图案。在感应焊前，在焊接界面处涂上一层薄薄的PA6粉末层。力学测试表明，结合织构-粉末（T-P）结构达到了最高的抗剪强度19.5 MPa，比未经处理的接头（7.2 MPa）提高了170%。微观分析表明，激光织构和粉末层间的协同效应促进聚合物完全渗透到表面微结构中，产生强大的机械联锁。热分析确定了PA6熔融无降解的最佳加工温度。断裂模式由界面破坏转变为纤维拔出的混合模式破坏，表明金属-复合材料结合良好。这种集成方法为汽车和航空航天应用中的轻量化结构组件提供了一种有前途的解决方案。

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引用次数: 0

Improved properties of high-density polyethylene by integrating high content of bio-fillers based on green nanolignin for applications in plastic industry 以绿色纳米木质素为基础，集成高含量的生物填料，改善高密度聚乙烯的性能，用于塑料工业

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2025-12-15 DOI: 10.1016/j.jcomc.2025.100688

Olalla. Sanchez-Sobrado , Alexander F. Tiniakos , Rebeca. Abalde , Marisol. Rivas , Alexios. Grigoropoulos , Angeliki. Nikolaou , Alexandros. Zoikis-Karathanasis , Ioanna. Deligkiozi , Ricardo. Losada

A study on the processability and physical and mechanical properties of different thermoplastic-based green nanocomposite materials for applications in injection processes is presented: commercial high-density polyethylene acting as the polymeric matrix and high contents of two types of modified nanolignins serving as bio-based fillers. It is a novel procedure to obtain good dispersibility of high loadings of bio-fillers in polyethylene which is difficult to achieve according to literature. The inclusion of green fillers brings property enhancements that are normally seen with expensive nanofillers like carbon nanotubes or graphene: improvement of mechanical properties while keeping good thermal stability and antioxidant properties has been obtained. To compare the effect of the inclusion of the two different nanofillers at 15, 25 and 35 % wt loadings on the characteristics of polyethylene, physical, mechanical, and morphological tests were performed. Injection pellets were fabricated and used to fabricate coupons to evaluate the mechanical features by performing both flexural and tensile tests. Remarkable enhancements (up to 60 % with respect to the neat polymer) of certain mechanical properties were observed for composites with 35 % wt loading of nanofillers. Moreover, investigating the effect of the bio-based nanolignins inclusion at high loadings on both crystallization and melting temperature suggested the robust thermal stability of the presented composites. As nanolignin is a renewable filler-type, it will bring properties like low-cost, low toxicity and partially replace petroleum-based stabilizers or other additives. Polyethylene with nanolignin becomes a “partially bio-based” high-performance material without changing the polymer backbone.

本文研究了不同热塑性绿色纳米复合材料的可加工性和物理力学性能，并将其应用于注射工艺中：商用高密度聚乙烯作为聚合物基体，高含量的改性纳米木质素作为生物基填料。在聚乙烯中获得高负荷生物填料的良好分散性是一种新的方法，这在文献中是很难实现的。绿色填料的加入带来了性能的增强，这通常是在昂贵的纳米填料（如碳纳米管或石墨烯）中看到的：在保持良好的热稳定性和抗氧化性能的同时，提高了机械性能。为了比较两种不同的纳米填料在15%、25%和35%重量负荷下对聚乙烯特性的影响，进行了物理、机械和形态学测试。制备了注射颗粒，并用于制作薄片，通过进行弯曲和拉伸试验来评估机械特性。当纳米填料重量为35%时，复合材料的某些机械性能显著增强（与纯聚合物相比，增强幅度高达60%）。此外，研究了高负载下生物基纳米木质素包合物对结晶温度和熔化温度的影响，表明所制备的复合材料具有良好的热稳定性。纳米木质素是一种可再生填料，具有低成本、低毒等特点，可以部分替代石油基稳定剂或其他添加剂。含有纳米木质素的聚乙烯在不改变聚合物骨架的情况下成为一种“部分生物基”的高性能材料。

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引用次数: 0

Advancements in biochar-reinforced 3D printing filaments for material extrusion: A review on material performance, sustainability, and circular economy 用于材料挤压的生物炭增强3D打印长丝的进展：材料性能、可持续性和循环经济综述

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2025-12-08 DOI: 10.1016/j.jcomc.2025.100687

Diana Rose R. Coronado , Wei-Hsin Chen , Aristotle T. Ubando

Additive manufacturing has emerged as a promising technology in the manufacturing sector. However, challenges in achieving the desired thermal and mechanical performance often result in reliance on fossil-based fillers. Biochar, a carbon-rich material derived from agricultural waste, has gained attention as an eco-friendly additive. Factors influencing the performance of biochar-reinforced polymer composite from conventional manufacturing were obtained and investigated in biochar-reinforced 3D printing filaments. With a relatively new research area, this review synthesizes recent progress and pioneering studies on applying lignocellulosic biochar for 3D printing filament for material extrusion. The parameters identified include biochar feedstock type, production method, loading level, and compatibilizers. Biochar produced at lower temperatures (<500.0 °C) enhances mechanical strength, while higher temperatures (>700.0 °C) improve thermal resistance. Successful biochar loading for 3D printing filament ranges from 0.1 to 0.6 wt% for fruit by-products biochar and up to 50 wt% for wood-derived biochar, with tensile strength, flexural strength, and modulus improved by up to 60.0 %, 82 % and 175 %, respectively. Biochar also enhances interfacial bonding with a compatibilizer, with successful biochar loading increased from 0.6 wt% to 1.0 wt%. This review also explores the broader role of biochar-reinforced 3D printing filaments in advancing a circular and carbon-neutral economy, addressing the 6 “R”s of sustainability, alongside economic considerations, including cost-effectiveness and market potential. The discussion highlights the commercial viability of biochar as a filler and its potential to support sustainable, low-impact manufacturing, positioning it as a valuable solution in the transition toward greener production systems.

增材制造已经成为制造业中一项很有前途的技术。然而，在实现理想的热和机械性能方面的挑战往往导致对化石基填料的依赖。生物炭是一种从农业废弃物中提取的富含碳的材料，作为一种环保添加剂而受到关注。通过对生物炭增强3D打印长丝的研究，获得了影响生物炭增强聚合物复合材料性能的因素。作为一个相对较新的研究领域，本文综述了木质纤维素生物炭用于材料挤压3D打印长丝的最新进展和开创性研究。确定的参数包括生物炭原料类型、生产方法、负荷水平和增容剂。在较低温度（> 500.0°C）下生产的生物炭可以提高机械强度，而在较高温度（>700.0°C）下生产的生物炭可以提高耐热性。3D打印长丝的成功生物炭负载范围为水果副产品生物炭的0.1 - 0.6 wt%，木材衍生生物炭的高达50 wt%，拉伸强度、弯曲强度和模量分别提高了60.0%、82%和175%。生物炭还通过增容剂增强了界面键合，成功的生物炭负载从0.6 wt%增加到1.0 wt%。本综述还探讨了生物炭增强3D打印长丝在推进循环和碳中和经济方面的更广泛作用，解决了可持续性的6个“R”，以及经济考虑，包括成本效益和市场潜力。讨论强调了生物炭作为填料的商业可行性及其支持可持续、低影响制造的潜力，将其定位为向绿色生产系统过渡的有价值的解决方案。

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引用次数: 0

LayGrade: Design and fabrication of a layer-graded bio-based composite from wood waste LayGrade：设计和制造一种由木材废料制成的层级生物基复合材料

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2025-11-25 DOI: 10.1016/j.jcomc.2025.100685

Giulia Pelliccia, Roberto Naboni

This study introduces a fully bio-based functionally graded composite developed from pine processing waste to enable structural and optical performance control in architectural components. Rosin, beeswax, and sawdust were combined in defined ratios to produce stratified composites exhibiting spatially tunable stiffness and translucency. Mechanical characterisation showed a progressive increase in tensile strength from 1.21 to 2.89 MPa and compressive strength from 9.19 to 39.27 MPa with increasing sawdust content (0–60 wt%), accompanied by a corresponding decrease in light transmittance. Mix-specific calibration of CNC milling parameters ensured dimensional precision and defect-free surfaces across gradients. These data informed a voxel-based computational workflow coupling material composition with adaptive machining parameters to achieve local control of mechanical and optical behaviour within a single artefact. A graded tile demonstrator validated the framework, demonstrating continuous variation in stiffness and translucency through depth-controlled fabrication. The work establishes a reproducible pathway linking bio-composite formulation, digital design, and adaptive manufacturing, advancing wood-waste upcycling toward performance-driven applications in sustainable architecture.

本研究介绍了一种从松木加工废料中开发的全生物基功能分级复合材料，用于建筑构件的结构和光学性能控制。松香、蜂蜡和锯末以确定的比例组合，产生具有空间可调刚度和半透明的分层复合材料。力学特性表明，随着木屑含量（0-60 wt%）的增加，材料的抗拉强度从1.21增加到2.89 MPa，抗压强度从9.19增加到39.27 MPa，同时透光率也相应降低。混合特定的数控铣削参数校准确保了尺寸精度和跨梯度的无缺陷表面。这些数据为基于体素的计算工作流提供了信息，该工作流将材料成分与自适应加工参数相结合，从而在单个工件中实现机械和光学行为的局部控制。分级瓷砖演示验证了框架，通过深度控制制造展示了刚度和半透明的连续变化。这项工作建立了一条可复制的途径，将生物复合材料配方、数字设计和自适应制造联系起来，将木材废料的升级回收推进到可持续建筑的性能驱动应用中。

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引用次数: 0

Effects of resin types on the durability of single yarn polymer composites exposed to hygrothermal environment 树脂类型对单纱聚合物复合材料在湿热环境下耐久性的影响

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100676

Abdullah Iftikhar , Allan Manalo , Zaneta Senselova , Wahid Ferdous , Mazhar Peerzada , Hannah Seligmann , Kate Nguyen , Brahim Benmokrane

This study evaluated the durability of glass fibre composites prepared using bio-epoxy, vinyl ester and epoxy resin when exposed to a simulated hygrothermal environment. Initially, glass fibre yarns, resins and single yarn composites were exposed to 60oC at 98% relative humidity for up to 3000 h. This was followed by the thermal (DSC), chemical (FTIR), tensile and interfacial shear strength characterization, and the morphological observations under the scanning electron microscope. Results revealed that the resin types significantly influenced the durability of glass fibre yarn composites. Bio-epoxy and vinyl ester resin exhibited thermal stability after exposure to a hygrothermal environment for 3000 h, with an increment of 19oC in the glass transition temperature of epoxy because of the additional cross-linking of the polymeric chain. FTIR spectra reveal that bio-epoxy was chemically stable, while epoxy and vinyl ester resin have undergone chemical degradation because of hydrolysis. The tensile strength of fibre yarn was decreased by 37% because of blistering at the fibre surface, while a reduction of 22%, 10%, and 20% was observed for epoxy, bio-epoxy, and vinyl ester, respectively. Furthermore, the interfacial shear strength was reduced by 15%, 6%, and 25% for epoxy, bio-epoxy, and vinyl ester composites, respectively. Despite the Tg increase, hydrolytic chain scission and damage at the interface reduced the mechanical strength of epoxy. Analytical Hierarchy Process revealed that bio-epoxy resin performed best under hygrothermal conditions when mechanical properties were a priority, whereas vinyl ester resin performed best if physical or thermal properties were most important.

本研究评估了生物环氧树脂、乙烯基酯和环氧树脂制备的玻璃纤维复合材料在模拟湿热环境下的耐久性。首先，将玻璃纤维纱线、树脂和单纱复合材料暴露在60℃、98%相对湿度下长达3000小时。随后进行热（DSC）、化学（FTIR）、拉伸和界面剪切强度表征，并在扫描电镜下进行形态学观察。结果表明，树脂类型对玻璃纤维纱复合材料的耐久性有显著影响。生物环氧树脂和乙烯基酯树脂在湿热环境中暴露3000 h后表现出热稳定性，由于聚合物链的额外交联，环氧树脂的玻璃化转变温度增加了19℃。红外光谱分析表明，生物环氧树脂具有化学稳定性，而环氧树脂和乙烯基酯树脂由于水解而发生了化学降解。由于纤维表面起泡，纤维纱线的抗拉强度降低37%，而环氧树脂、生物环氧树脂和乙烯基酯的抗拉强度分别降低22%、10%和20%。此外，环氧树脂、生物环氧树脂和乙烯基酯复合材料的界面剪切强度分别降低了15%、6%和25%。尽管Tg升高，但水解链断裂和界面损伤降低了环氧树脂的机械强度。层次分析法表明，生物环氧树脂在湿热条件下表现最佳，当机械性能优先考虑时，乙烯基酯树脂在物理或热性能最重要时表现最佳。

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引用次数: 0

Parametric finite element analysis of flexural behavior in FRP-reinforced beams frp加固梁受弯性能的参数化有限元分析

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100677

M. Talha Junaid , Rouba Alzoubi , Aroob Alateyat , Samer Barakat

The increasing use of fiber-reinforced polymer (FRP) bars as internal reinforcement offers a corrosion-resistant and lightweight alternative to steel in concrete structures; however, their linear-elastic behavior often limits ductility and crack control. To address this challenge, the combination of FRP reinforcement with advanced and sustainable concrete types such as fiber-reinforced and alkali-activated concretes, has emerged as a promising yet underexplored solution. This study investigates the flexural behavior of beams made from four concrete types: Portland Cement Concrete (PCC), Alkali-Activated Concrete (AAC), Fiber-Reinforced Concrete (FRC), and Fiber-Reinforced Alkali-Activated Concrete (FRAAC), all reinforced with Glass FRP (GFRP) bars. A detailed nonlinear finite element model was developed using ABAQUS software, employing 3D solid (C3D8R) elements for concrete and truss (T3D2) elements for FRP bars with embedded-region constraints. The Concrete Damaged Plasticity (CDP) model simulated concrete behavior, while FRP reinforcement was modeled as linear-elastic up to rupture. The model was calibrated and validated against experimental results, achieving high accuracy in predicting load–deflection responses and failure modes. A comprehensive parametric study of 224 simulations examined the influence of FRP type, reinforcement ratio, and beam depth. Results showed that CFRP bars yielded the highest load increase (up to 90%), while increasing tensile reinforcement ratio (0.5–3.28%) enhanced capacity by 11–132% and reduced deflection by 54%. Increasing beam depth (250–400 mm) improved load capacity by up to 172%, with compression reinforcement contributing less than 11%. The findings highlight the significance of integrating FRP reinforcement with sustainable fiber- and geopolymer-based concretes, demonstrating the capability of finite element analysis in optimizing hybrid high-performance structural systems.

越来越多地使用纤维增强聚合物（FRP）钢筋作为内部钢筋，为混凝土结构中的钢材提供了一种耐腐蚀和轻质的替代品；然而，它们的线弹性特性往往限制了延性和裂纹控制。为了应对这一挑战，将FRP加固与先进且可持续的混凝土类型（如纤维增强混凝土和碱活化混凝土）相结合，已经成为一种有希望但尚未得到充分探索的解决方案。本研究调查了由四种混凝土类型制成的梁的弯曲行为：波特兰水泥混凝土（PCC），碱活化混凝土（AAC），纤维增强混凝土（FRC）和纤维增强碱活化混凝土（FRAAC），均用玻璃钢（GFRP）钢筋加固。采用ABAQUS软件建立了详细的非线性有限元模型，混凝土采用三维实体（C3D8R）单元，FRP筋采用桁架（T3D2）单元，具有嵌入式区域约束。混凝土损伤塑性（CDP）模型模拟混凝土的行为，而FRP筋模型为线弹性直至破裂。根据实验结果对模型进行了标定和验证，在预测载荷-挠度响应和破坏模式方面具有较高的准确性。224个模拟的综合参数研究检验了FRP类型、配筋率和梁深度的影响。结果表明：CFRP筋的荷载增幅最大，可达90%；提高抗拉配筋率（0.5 ~ 3.28%），承载力提高11% ~ 132%，挠度降低54%；增加梁深（250 - 400mm）可使承载能力提高172%，而抗压加固的贡献不到11%。研究结果强调了将FRP加固与可持续纤维和地聚合物基混凝土相结合的重要性，证明了有限元分析在优化混合高性能结构体系中的能力。

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引用次数: 0

Interfacial damage evolution in hygrothermally aged CF/PPA composites used in type V hydrogen tanks: A multi-scale approach V型储氢罐中湿热老化的CF/PPA复合材料界面损伤演化：多尺度方法

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100679

Clara Penavayre , Joseph Fitoussi , Emmanuel Richaud , Philippe Papin , Jeremie Bouneb , Gilles Hochstetter , Mohammadali Shirinbayan

This paper presents a multi-scale experimental investigation into the damage mechanisms in carbon fiber-reinforced polyphthalamide (CF/PPA) composites subjected to hygrothermal aging. The study specifically targets their suitability for structural components in advanced hydrogen storage systems, such as Type V pressure vessels. Polyphthalamides (PPAs), as semi-aromatic polyamides, offer superior thermal stability, chemical resistance, and mechanical performance compared to conventional aliphatic polyamides, making them promising candidates for structural components exposed to harsh environments. In order to simulate more severe environmental exposure, accelerated hygrothermal aging tests were conducted at 50 °C in immersion. A range of microscopic to macroscopic characterization techniques were used to assess changes in mechanical performance and microstructural integrity. The analysis revealed that the CF/PPA composites retained good matrix ductility even after aging, indicating the resilience of the semi-aromatic polyamide matrix under hygrothermal stress. Multi-scale damage analysis has been performed on both unaged and aged samples at 50 °C for various aging times. The dominant damage mechanism identified was decohesion at the fiber/matrix interface, rather than bulk matrix degradation. This interfacial debonding has a significant impact on mechanical performance and is attributed to moisture-induced weakening of interfacial interactions. These findings emphasize the potential of CF/PPA composites for use in high-performance hydrogen storage applications, while highlighting the critical need for interface-tailored designs to enhance environmental durability.

采用多尺度实验研究了碳纤维增强聚苯二胺（CF/PPA）复合材料在湿热老化下的损伤机理。该研究特别针对它们在先进储氢系统（如V型压力容器）中的结构部件的适用性。与传统的脂肪族聚酰胺相比，聚酞胺（PPAs）作为半芳香族聚酰胺，具有优越的热稳定性、耐化学性和机械性能，使其成为暴露在恶劣环境下的结构部件的有希望的候选者。为了模拟更恶劣的环境暴露，在50°C浸泡下进行了加速湿热老化试验。一系列微观到宏观的表征技术被用来评估机械性能和微观结构完整性的变化。分析表明，CF/PPA复合材料在老化后仍保持良好的基体延展性，说明半芳香族聚酰胺基体在湿热应力下的弹性。在50°C下，对不同时效时间的未时效和时效样品进行了多尺度损伤分析。主要的损伤机制是纤维/基体界面的脱黏，而不是基体的降解。这种界面脱粘对机械性能有显著影响，并归因于水分引起的界面相互作用减弱。这些发现强调了CF/PPA复合材料在高性能储氢应用中的潜力，同时强调了对界面定制设计的迫切需求，以提高环境耐久性。

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引用次数: 0

Axial compressive performance of sustainable BFRP-confined rectangular columns using recycled brick aggregates 使用再生砖骨料的可持续bfrp约束矩形柱的轴压性能

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100653

Chisanuphong Suthumma , Ali Ejaz , Muhammad Jawed Iqbal , Ekkachai Yooprasertchai , Qudeer Hussain , Gritsada Sua-iam , Burachat Chatveera , Preeda Chaimahawan , Panumas Saingam

This study examines the mechanical behavior of basalt FRP confined rectangular concrete columns using crushed brick aggregates, addressing a research gap. While previous work focused on circular and square columns, this is the first to explore rectangular ones. The use of waste brick aggregates promotes sustainability. The study aims to assess the mechanical properties, expecting improvements in strength and ductility, and could lead to broader applications of basalt FRP. A total of 32 rectangular specimens were tested to evaluate the influence of aggregate type, concrete grade, and number of BFRP layers (0, 2, 4, and 6) on axial compressive performance. Results showed that BFRP confinement significantly enhanced strength and ductility, with maximum gains of 81% in strength and 230% in strain observed in low-strength natural aggregate concrete. Although recycled brick aggregate concrete (RBAC) exhibited lower stiffness, BFRP still provided up to 23% strength improvement. The effectiveness of confinement reduced with increasing unconfined strength. Post-peak analysis revealed that additional BFRP layers delayed stiffness degradation, promoting more ductile failure. Experimental elastic modulus closely matched ACI predictions in natural aggregate (NA) specimens but was overestimated in RBAC due to its higher porosity. The findings demonstrate the viability of BFRP confinement for enhancing the structural performance of sustainable concrete, while emphasizing the need for aggregate-specific design considerations. Design-oriented modelling was adopted to predict the complete stress-strain response of BFRP-confined concrete incorporating both natural and recycled brick coarse aggregates. A two-branch idealization of the compressive response was performed. Several key points were identified and predicted by using nonlinear regression analysis. The proposed approach closely predicted the response of BFRP-confined concrete.

本研究考察了使用碎砖骨料的玄武岩FRP约束矩形混凝土柱的力学行为，解决了研究空白。虽然以前的工作主要集中在圆形和方形的柱子上，但这是第一次探索矩形的柱子。废砖骨料的使用促进了可持续性。该研究旨在评估玄武岩FRP的力学性能，期望在强度和延性方面有所改善，并可能导致玄武岩FRP的更广泛应用。为了评估骨料类型、混凝土等级和BFRP层数（0、2、4和6层）对轴压性能的影响，共对32个矩形试件进行了试验。结果表明，BFRP约束显著提高了混凝土的强度和延性，在低强度天然骨料混凝土中，强度和应变分别提高了81%和230%。虽然再生砖骨料混凝土（RBAC）表现出较低的刚度，但BFRP仍提供高达23%的强度提高。约束的有效性随着无侧限强度的增加而降低。峰后分析显示，额外的BFRP层延迟了刚度退化，促进了更多的延性破坏。实验弹性模量与天然骨料（NA）试样的ACI预测非常接近，但由于RBAC的孔隙率较高，因此高估了其弹性模量。研究结果证明了BFRP约束在增强可持续混凝土结构性能方面的可行性，同时强调了骨料特定设计考虑的必要性。采用面向设计的模型来预测含有天然和再生砖粗骨料的bfrp约束混凝土的完整应力-应变响应。压缩响应的两分支理想化被执行。利用非线性回归分析识别和预测了几个关键点。该方法能较好地预测bfrp约束混凝土的响应。

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引用次数: 0

Seismic rehabilitation of flexure-damaged RC shear walls using a hybrid UHPC–FRP composites with EBROG-installed strips and FRP anchors 使用混合UHPC-FRP复合材料与ebrog安装条和FRP锚对受弯损伤的RC剪力墙进行地震修复

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100665

Mehdi Khorasani, Davood Mostofinejad, Ali MohammadSalehi

This study investigates a hybrid repair strategy for flexural-damaged reinforced concrete (RC) shear walls, combining ultra-high-performance concrete (UHPC) and fiber-reinforced polymer (FRP) strips installed using the externally bonded reinforcement on grooves (EBROG) technique with FRP anchors. Three full-scale walls were tested under cyclic lateral loading: a reference wall (FCW), a UHPC-repaired wall (R-UHPC), and a hybrid UHPC–FRP wall (R-UHPC-FRP). Both repair approaches effectively restored strength, with the hybrid wall exceeding the control’s capacity by 13 % (279 vs. 249 kN). However, ductility decreased by 35–45 % compared to the control (3.8–4.9 vs. 2.25–3.2). Energy dissipation was partially recovered with UHPC but reached up to 90–95 % of the control’s capacity at 2 % drift in the hybrid system. Stiffness retention was also improved, with the hybrid wall maintaining values comparable to the control beyond 1 % drift. Despite lower hysteretic damping than the control, the hybrid wall showed improved damping at higher deformations. Overall, the UHPC–FRP hybrid repair, enhanced by the EBROG method, proves effective in restoring strength and stiffness while substantially recovering energy dissipation, offering a promising solution for seismic rehabilitation of RC shear walls.

本研究研究了受弯损伤的钢筋混凝土（RC）剪力墙的混合修复策略，将超高性能混凝土（UHPC）和纤维增强聚合物（FRP）条结合起来，使用外部粘结加固沟槽（EBROG）技术安装FRP锚。在循环横向荷载下测试了三面墙：参考墙（FCW）， uhpc -修复墙（R-UHPC）和UHPC-FRP混合墙（R-UHPC- frp）。两种修复方法都有效地恢复了强度，混合管壁的强度比对照管壁高出13%（279比249千牛）。然而，与对照组相比，延展性下降了35 - 45% （3.8-4.9 vs. 2.25-3.2）。在混合系统中，当漂移2%时，UHPC可以部分恢复能量耗散，但能量耗散达到控制能力的90 - 95%。刚度保持也得到了改善，混合壁保持值与超过1%漂移的对照组相当。尽管混合壁的滞回阻尼比对照组低，但在高变形下，混合壁的阻尼有所改善。总体而言，经EBROG方法增强的UHPC-FRP复合修复在恢复强度和刚度的同时有效地恢复了能量耗散，为RC剪力墙的抗震修复提供了一个有前途的解决方案。

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引用次数: 0

Revalorisation of recycled PLA through Halloysite nanotube integration for mechanical and thermal property improvement 利用高岭石纳米管整合再生PLA以改善其机械和热性能

IF 7 Q2 MATERIALS SCIENCE, COMPOSITES

Composites Part C Open Access

Pub Date : 2025-10-01 DOI: 10.1016/j.jcomc.2025.100670

Anbuchezhiyan Gnanasambandam , Vigneshwaran Shanmugam , Elif Kaynak , Oisik Das

This study investigates the effect of Halloysite nanotube (HNT) reinforcement on the mechanical, thermal, and structural properties of recycled polylactic acid (rPLA) composites. Composites were prepared with 1-5 wt.% HNTs and characterised using tensile, flexural, compressive testing, thermogravimetric analysis (TGA), and X-ray diffraction (XRD). Tensile strength increased from 42.98 MPa for neat rPLA to a maximum of 49.39 MPa at 2 wt.% HNT, while tensile modulus improved steadily from 2423.13 MPa to 2971.26 MPa at 5 wt.%. Flexural strength peaked at 78.54 MPa (22 % improvement compared to neat rPLA) at 3 wt.%, and the highest flexural modulus of 2292.30 MPa was achieved at 4 wt.% HNT. Under compressive loading, strength and modulus increased from 100.94 MPa and 2361.52 MPa for neat rPLA to 108.69 MPa and 2479.87 MPa, respectively, at 5 wt.% HNT, showing improved resistance to deformation. Thermal degradation temperatures rose from 452.12 °C for rPLA to 465.58 °C at 5 wt.% HNT, with char residue at 600 °C increasing from 4.23 % to 9.96 %, confirming the thermal barrier effect of Halloysite. XRD analysis showed enhanced crystallinity, increasing from 57.49 % (neat rPLA) to 59.22 % at 5 wt.% HNT, indicating effective nucleation and structural ordering induced by the nanotubes. Overall, the incorporation of 2-4 wt.% Halloysite offered the most balanced improvement in strength, stiffness, and thermal stability. These results demonstrate that rPLA-Halloysite composites can be suitable for sustainable, high-performance applications in packaging, automotive interiors, and structural bioplastics.

研究了高岭土纳米管（HNT）增强剂对再生聚乳酸（rPLA）复合材料力学性能、热性能和结构性能的影响。用1-5 wt.%的HNTs制备复合材料，并通过拉伸、弯曲、压缩测试、热重分析（TGA）和x射线衍射（XRD）对其进行表征。拉伸强度从纯rPLA的42.98 MPa增加到2 wt.% HNT时的最大值49.39 MPa，拉伸模量从2423.13 MPa稳步提高到5 wt.% HNT时的2971.26 MPa。在3 wt.% HNT时，抗弯强度达到78.54 MPa（比纯rPLA提高22%），在4 wt.% HNT时，抗弯模量达到2292.30 MPa。在压缩载荷作用下，纯rPLA的强度和模量分别从100.94 MPa和2361.52 MPa增加到108.69 MPa和2479.87 MPa，在5 wt.% HNT条件下，rPLA的抗变形能力有所提高。在5 wt.% HNT条件下，rPLA的热降解温度从452.12℃上升到465.58℃，600℃时炭渣从4.23%上升到9.96%，证实了高岭土的热障作用。XRD分析表明，在5 wt.% HNT条件下，纳米管的结晶度从57.49%（纯rPLA）提高到59.22%（纯rPLA），表明纳米管诱导了有效的成核和结构有序。总的来说，加入2-4 wt.%的高岭土在强度、刚度和热稳定性方面提供了最平衡的改善。这些结果表明，rpla -高岭土复合材料可以适用于包装、汽车内饰和结构生物塑料的可持续、高性能应用。

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引用次数: 0