Article
Mechanics
O. Falco, C. S. Lopes, D. E. Sommer, D. Thomson, R. L. Avila, B. H. A. H. Tijs
Summary: The accurate analysis of multi-directional composite laminates during impact events is crucial for the design of lightweight aircraft structures. This study combines experimental and numerical analyses to cover all aspects of laminates, from the onset of damage to full penetration. Extensive validation tests demonstrate the capability of simulations to accurately predict the damage and failure mechanisms under low-velocity impact loading.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
X. Lu, X. M. Guo
Summary: In this study, a non-local continuum damage model is developed to analyze the progressive failure of laminated composites. The model incorporates an orthotropic non-local integral strategy with two internal length scales, allowing for accurate predictions of damage evolution. Additionally, an interactive damage transfer scheme is proposed to capture the interaction between matrix cracking and interface delamination. The model demonstrates superior performance over conventional methods in predicting the complex failure mechanisms of composite laminates.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Composites
Sina AhmadvashAghbash, Christian Breite, Mahoor Mehdikhani, Yentl Swolfs
Summary: Longitudinal fibre-matrix debonding is influenced by various factors such as interfacial strength, fracture toughness, thermal residual stresses, friction, and matrix plasticity. The proposed finite element model accounts for these factors and allows for debond propagation based on assigned interfacial properties. Parametric studies demonstrate that higher values for interfacial friction coefficient, thermal residual stress, and interfacial fracture toughness restrict debond propagation, while matrix plasticity facilitates it.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
M. Shafayet Zamil, Duane P. Harland, Brian K. Fisher, Michael G. Davis, James R. Schwartz, Anja Geitmann
Summary: Research has shown that hair fiber growth is influenced by a variety of biological, biochemical, and biomechanical factors, with biomechanical factors playing a largely unknown role. A multiscale mechanical modeling approach revealed that biomechanical features such as follicle geometry and keratinization-mediated hardening are likely crucial in hair fiber protrusion. Fine tuning biomechanical parameters is proposed as a key strategy to ensure smooth hair growth.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Materials Science, Composites
Sina AhmadvashAghbash, Babak Fazlali, Mahoor Mehdikhani, Yentl Swolfs
Summary: This study proposes a novel approach using finite element modeling to comprehensively simulate the stress redistribution around a broken fiber in unidirectional composites. The parametric study reveals that factors such as friction coefficient and interfacial fracture toughness significantly affect the stress concentration factor of intact fibers. Introducing interfacial debonding reduces the overpredictions of stress concentration factor.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Nicholas R. Pilato, Richard Butler, James Trevarthen, Alexander J. G. Lunt
Summary: This study presents a novel modelling method for carbon fibre composite laminates with wrinkles, using wrinkle geometries measured from non-destructive testing and sample cross-sections. The resulting finite element models allow for rapid assessment of the influence of various physical wrinkle parameters on the mechanical properties of laminates, with validation against analytical models and experimental data.
MATERIALS & DESIGN
(2022)
Article
Engineering, Manufacturing
A. Cocchi, O. Montagnier, C. Hochard
Summary: Flat hourglass specimens were used to assess the compressive behaviour of FRP using two testing techniques. The hourglass shape ensured failure at the center of the specimen and minimized stress concentration. Bending tests and DIC measurements were performed, with a proposed procedure for calculating bending moment validated in the presence of large displacements. Two different materials were tested and compared, and compression tests were also carried out to compare hourglass specimens to standardized dog-bone samples. The two testing techniques were analyzed and compared for their effectiveness.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Engineering, Manufacturing
Charles de Kergariou, Byung Chul Kim, Adam Perriman, Antoine Le Duigou, Sofiane Guessasma, Fabrizio Scarpa
Summary: This paper describes a novel voxel-based technique for modeling 3D printed continuous yarns of fiber composites. By utilizing a set of variables and an evolutionary algorithm, this technique simplifies and accelerates the design process of parts. Experimental results demonstrate the effectiveness of this modeling strategy.
ADDITIVE MANUFACTURING
(2022)
Article
Mechanics
S. L. J. Millen, Z. Ullah, B. G. Falzon
Summary: The finite element mesh aligned along the fibre direction is crucial in predicting damage accurately, especially in the presence of cracks. However, when matrix crack paths are not established a priori or may not be the dominant damage mode, fibre mesh alignment is unnecessary.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Manufacturing
Jia Ge, Wei Tan, Shahzad Ahmad, Brian G. Falzon, Giuseppe Catalanotti, Colm Higgins, Yan Jin, Dan Sun
Summary: The global commitment to reducing carbon emissions has led to the use of sustainable carbon-fibre-reinforced thermoplastic composites (CFRTPs). When machining CFRTPs, challenges arise due to their ductile-brittle composition and sensitivity to high temperatures. This study conducted temperature-controlled cutting experiments to investigate the temperature-dependent cutting physics of CFRTPs and analyzed the microstructural morphology and damage using advanced microscopy. The experimental results were further explained using a finite element analysis model considering thermal softening.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2024)
Article
Materials Science, Composites
A. Solis, E. Barbero, S. Sanchez-Saez
Summary: The study analyzed the influence of fibre-orientation on the progression of delamination using the Serial/Parallel Mixing Theory and a continuum damage model, and validated the model with experimental results. An increase in fibre angle resulted in loss of stiffness and strength, while the difference in delamination progression along the width of the beam highlighted the need for a three-dimensional representation.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Composites
Mudan Chen, Bing Zhang, Sven Friedemann, Giuliano Allegri, Stephen R. Hallett
Summary: This study investigates the effects of Z-pins on the magnetic properties of composite laminates, showing that carbon-fiber pins have little influence while Ni/Fe alloy pins increase the laminate magnetic susceptibility. The out-of-plane susceptibility exhibits nonlinear behavior dependent on the pin volume fraction, while saturation magnetization is proportional to the pin volume fraction.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Construction & Building Technology
Marta Gil Perez, Nikolas Frueh, Riccardo Magna, Jan Knippers
Summary: Coreless filament winding is a robotic fabrication technique that reduces the use of core material to create lightweight structures. The latest project combines this technique with fibre-polymer composites and laminated veneer lumber to create the first multi-storey building system. Through load testing and material optimization, the structural system's reliability and load-carrying capacity have been validated.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Pei-Liang Bian, Hai Qing
Summary: This study investigates the influence of carbon nanofibers (CNFs) on carbon fiber (CF) reinforced polymer (CFRP), finding that CNFs can improve the strength and toughness of composites, release stress concentrations, and increase the initial damage threshold.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Materials Science, Characterization & Testing
Damijan Zorko, Joze Tavcar, Milan Bizjak, Roman Sturm, Zoran Bergant
Summary: The study investigated high cycle fatigue behavior of autoclave-cured carbon fiber-reinforced polymer (CFRP) composite gears, identifying epoxy matrix microcracking as the main mechanism leading to final delamination failure. CFRP gears showed significantly improved performance and longer fatigue lifespan compared to other materials.
Article
Engineering, Multidisciplinary
Keyu Zhu, Xitao Zheng, Jing Peng, Jiaming Sun, Ruilin Huang, Leilei Yan
Summary: This paper discusses the influence of multiple impacts on the compression strength of honeycomb sandwich structures with composite face sheets. It is found that the size of the impactor affects the turning point of the compression strength. Additionally, high impact energy leads to damage in the bottom face sheet and reduces the overall compression strength.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Danqian Wang, Yanfei Yue, Jueshi Qian
Summary: Magnesium Potassium Phosphate Cement (MKPC) as a binder for steel rebars shows improved corrosion resistance when subjected to carbonation, due to the increase in pH and the formation of a more protective oxide film.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Zhibin Li, Wenyu Wang, Pengcheng Xue, Xingyu Wei, Jian Xiong
Summary: This work proposes a design approach and manufacturing method for carbon fiber reinforced plastic (CFRP) corrugated sandwich truncated cones (CSTC) to improve their anti-debonding ability and ensure reliability. The study establishes theoretical models for CSTCs' stiffness and failure modes, which are verified through experiments and finite element analysis (FEA). The research reveals the effect of geometric parameters on failure modes and performs an optimal design for CSTC structures. The findings have significant implications for the design and application of lightweight CSTCs in constructions, such as launch vehicle adapters.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Mingyu Zhang, Lei Chu, Jiahua Chen, Fuxun Qi, Xiaoyan Li, Xinliang Chen, Deng-Guang Yu
Summary: This review summarizes the different structures and construction methods of fibrous membranes with asymmetric wettability. It also reviews the biological applications of these membranes and suggests future challenges.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
E. Mofakhami, L. Gervat, B. Fayolle, G. Miquelard-Garnier, C. Ovalle, L. Laiarinandrasana
Summary: This study investigates the effects of fibre concentration on the mechanical response of welded glass-fibre-reinforced polypropylene (GF-PP). Experimental observations reveal a significant reduction in weld ratio, up to 60%, indicating a decreased strength compared to the bulk material. Increasing fibre content in the welded material results in a decrease in stress at break and strain at the maximum stress. The use of DIC technique and X-ray microtomography further confirms the localized strain amplification in the welded zone due to the significant increase in fibre density.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Emad Pourahmadi, Farjad Shadmehri, Rajamohan Ganesan
Summary: This research compares the mechanical properties of laminates manufactured using automated fiber placement and conventional autoclave curing methods. The results show that laminates manufactured using automated fiber placement have a lower interlaminar shear strength compared to laminates reconsolidated using autoclave curing. A finite element simulation method is proposed to quantitatively analyze these differences.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Johnny Jakobsen, Benny Endelt, Fahimeh Shakibapour
Summary: This study proposes a new bolted/pinned joining method for composite applications, which improves load transfer by introducing a patch-type reinforcement. Experimental results demonstrate significant improvements in both static and fatigue load conditions compared to existing methods. Finite element simulations highlight the advantage of this method, as it creates a more efficient load-transferring mechanism through different stress distributions.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Gisele G. Cintra, Janine D. Vieira, Daniel C. T. Cardoso, Thomas Keller
Summary: This paper proposes a novel approach to assess multi-crack behavior in layered fiber-polymer composites. The generated Compliance and R-curves provide useful insights into understanding the multiple delamination process and allow for separate evaluation of strain energy release rate (SERR) for each crack. The developed cohesive zone model successfully simulates the failure process zone of three parallel cracks, showing good agreement between the numerical model and experimental results.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Renil Thomas Kidangan, Sreedhar Unnikrishnakurup, C. Krishnamurthy, Krishnan Balasubramaniam
Summary: The induction heating process can accurately identify fiber orientation and stacking order, making it a valuable tool for large-area inspection and quality control in manufacturing fiber-reinforced composites.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Sungjun Hwang, Yousoo Han, Douglas J. Gardner
Summary: Bleached Kraft pulp, unbleached Kraft pulp, and old corrugated cardboard pulp are suitable for producing cellulose nanofibril suspensions. Spray drying is a fast, simple, cost-effective, and scalable drying method. Spray-dried cellulose nanofibrils can be used as reinforcing materials in polypropylene matrices. The particle size of cellulose nanofibrils affects the material properties.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Mehdi Mahdavi, Abbas Zolfaghari
Summary: This study aims to improve the recovery forces of shape memory polymers (SMPs) through material extrusion additive manufacturing. By using glass fiber (GF) as reinforcement and manufacturing multi-layer composite specimens, it was found that PLA with 6.62% GF exhibited the best recovery force, which was further optimized through annealing heat treatment.
COMPOSITES PART B-ENGINEERING
(2024)
Review
Engineering, Multidisciplinary
Xiang Ao, Antonio Vazquez-Lopez, Davide Mocerino, Carlos Gonzalez, De-Yi Wang
Summary: The vulnerability of natural fibers to heat and fire poses a significant challenge for their substitution of traditional fiber reinforcements in composite materials. Natural fiber/polymer composites (NFCs) are regarded as potential candidates for engineering applications due to their environmental friendliness and low-impact sourcing. Thus, appropriate approaches need to be implemented to enhance the fire safety of NFCs. This review summarizes and discusses the latest understanding of flammability and thermal properties of natural fibers, with a special focus on their interaction with polymer matrix in fire behavior. Additionally, the latest developments in flame-retardant approaches for NFCs are reviewed, covering both flame retardancy and fire structural integrity. Finally, future prospects and perspectives on fire safety of NFCs are proposed, providing insights into further advancements of NFCs.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Cheng Wang, Siqi Huo, Guofeng Ye, Bingtao Wang, Zhenghong Guo, Qi Zhang, Pingan Song, Hao Wang, Zhitian Liu
Summary: The demand for multifunctional, transparent epoxy resin with superior dielectric, mechanical, and fire-safety performances is increasing in modern industries. Researchers have developed an epoxidized, phosphaphenanthrene-containing poly(styrene butadiene styrene) (ESD) for advanced fire-safe epoxy resin, which maintains high transparency and improves UV-blocking property. The addition of 10 wt% ESD results in improved mechanical properties, decreased dielectric constant and loss, and outperformance compared to other fire-safe epoxy resins. This research provides an effective method for developing multifunctional flame-retardant epoxy resin.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Bo Pang, Heping Zheng, Zuquan Jin, Dongshuai Hou, Yunsheng Zhang, Xiaoyun Song, Yanan Sun, Zhiyong Liu, Wei She, Lin Yang, Mengyuan Li
Summary: This study develops an internal superhydrophobic material (ISM) using waste denitrification fly ash, which maintains stable hydrophobicity under harsh conditions of use and does not rely on expensive fluor-based surface modifications. The synthesized ISM has excellent matrix strength, strong waterproof properties, and retains superhydrophobicity even at damaged or friction interfaces.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Engineering, Multidisciplinary
Meirbek Mussatayev, Qiuji Yi, Mark Fitzgerald, Vincent K. Maes, Paul Wilcox, Robert Hughes
Summary: Real-time monitoring of carbon fibre composites during Automated Fibre Placement (AFP) manufacturing remains a challenge for non-destructive evaluation (NDE) techniques. This study designed a directional eddy-current (EC) probe to evaluate the detectability of out-of-plane wrinkles. Experimental evaluations and finite element modeling were conducted to better understand the relationship between eddy-current density and defect detection. The findings suggest that the probe configuration with an asymmetric driver coil and differential pickup coils shows the best capability for wrinkle detection.
COMPOSITES PART B-ENGINEERING
(2024)