Article
Mechanics
Cheng Huang, Mathew W. Joosten
Summary: The translaminar fracture toughness of two different continuous fibre 3D printed ply architectures was evaluated using a compact tension test. The performances of a baseline 0/90 cross-ply architecture and a semi-woven 0/90 ply architecture resembling Advanced Placed Ply (AP-Ply) fabricated using automated fibre placement were compared. The experimental results showed that the laminate architecture has a slight influence on the trans-laminar fracture toughness of 3D printed carbon fibre composites, and both ply architectures exhibited a rising R curve, with the semi-woven samples showing a less pronounced curve.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Composites
Peng Zhuo, Shuguang Li, Ian A. Ashcroft, Ivor A. Jones
Summary: Continuous fibre composite 3D printing technology has the potential to improve the mechanical properties of printed parts, but it is still in the early stages of development. This study aims to establish a practical application demonstrator by conducting preparatory developments in materials, printing process, and properties evaluation.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Composites
Dong Quan, Jiaming Liu, Liaojun Yao, Clemens Dransfeld, Rene Alderliesten, Guoqun Zhao
Summary: The adhesion between recycled carbon fibres (rCFs) and Polyphenylene-sulfide (PPS) fibres in rCF/PPS composites was tailored by UV-treatment of non-woven mats, leading to improved intralaminar fracture resistance and mechanical properties under tensile and shear loading conditions, but negatively affected interlaminar fracture resistance.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Manufacturing
O. Dolev, S. Osovski, A. Shirizly
Summary: The tensile behavior and fracture toughness of a hybrid Ti-6Al-4V alloy were examined, showing good properties without a preference for crack growth. The hybrid manufacturing approach studied here expands the current limitations of large-scale critical components and allows for higher throughput.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Kaitlynn M. Conway, Cody Kunka, Benjamin C. White, Garrett J. Pataky, Brad L. Boyce
Summary: Fracture toughness, rather than strength, is often the limiting factor of structural materials. Developing new base materials with improved fracture toughness often takes more than a decade. Alternatively, topological design has recently been expanded by additive manufacturing to improve fracture toughness in a cost-effective and simple manner across a range of materials.
MATERIALS & DESIGN
(2021)
Article
Mechanics
J. Dzugan, M. Seifi, S. Rzepa, M. Rund, M. Koukolikova, H. -w. Viehrig, Z. H. Liu, J. J. Lewandowski
Summary: The paper investigates three additive manufactured parts made of Ti-6Al-4V using Electron Beam Powder Bed Fusion technology, assessing their local mechanical properties and discussing them in relation to literature values.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Manufacturing
Mohanad Idrees, Giuseppe R. Palmese, Nicolas J. Alvarez
Summary: Interleaving is an effective method to improve delamination resistance in composites. However, there is a lack of design rules for the choice of resin in interleaving. While previous studies suggest that any resin can be used, our research shows that the choice of resin is critical for translating toughness properties.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Dong Quan, Ujala Farooq, Guoqun Zhao, Clemens Dransfeld, Rene Alderliesten
Summary: Exploring routes for the effective use of recycled carbon fibres (rCFs) is critical to improve the fracture toughness of carbon fibre/epoxy composites. This study demonstrated the potential of using rCFs with PPS fibres for interlayer toughening, resulting in significant enhancements in the interlaminar fracture properties. The main toughening mechanisms were found to be fiber bridging for rCF/PPS mats.
MATERIALS & DESIGN
(2022)
Article
Engineering, Manufacturing
Davoud M. Jafarlou, Bryer C. Sousa, Matthew A. Gleason, Gehn Ferguson, Aaron T. Nardi, Danielle L. Cote, Ian R. Grosse
Summary: The research introduces the cold spray process as a method for additive manufacturing of tantalum and extensively evaluates the material's mechanical properties. While anisotropy in the mechanical properties was observed, the material exhibited high strength and excellent isotropy. The study reveals that the cold spray process is suitable for producing tantalum components.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Fatih Daricik, Hulusi Delibas, Gokhan Canbolat, Alparslan Topcu
Summary: This study investigated the effects of short-term aging on additively manufactured PLA and ABS specimens. It was found that PLA materials are more susceptible to thermal aging than ABS materials, due to the contraction and expansion of fused polymer filaments affecting bonding strength between layers. Fracture characteristics of FDM polymer materials exposed to thermal aging differ based on filament orientation and aging time.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Engineering, Manufacturing
Christian Gauss, Kim L. Pickering, Nina Graupner, Joerg Muessig
Summary: This study demonstrates a method to improve the mechanical performance and thermo-mechanical stability of 3D printable polylactide (PLA) composites by incorporating fibres and increasing PLA crystallinity through heat treatment.
ADDITIVE MANUFACTURING
(2023)
Article
Chemistry, Physical
B. Vieille, A. Duchaussoy, S. Benmabrouk, R. Henry, C. Keller
Summary: This study investigates the impact of the original crack orientation on the fracture toughness of LPBF HX materials. The results show that samples with cracks parallel to the lasing plane have the highest fracture toughness values. Compared to cast specimens, the fracture toughness of LPBF specimens is 5-6 times higher.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Punit Kumar, Zhiguang Zhu, Sharon M. L. Nai, R. L. Narayan, U. Ramamurty
Summary: The study found that 304L austenitic stainless steel manufactured via the LPBF process exhibits high fracture toughness and strength at room temperature due to transformation induced plasticity, but the deformation mechanism changes with increasing temperature, leading to a significant decrease in J values and increased anisotropy.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Shang Li, Xuanpu Dong, Ali Chabok, Yutao Pei, Xun Zhang, Ying Chen, Jeff Th. M. De Hosson, Huatang Cao
Summary: A new method of fracture toughness analysis is introduced by conducting in-situ microcantilever bending in an electron microscope on a high vanadium high-speed steel coating fabricated through plasma transferred arc additive manufacturing. This study offers novel insights into the micromechanical behavior of advanced materials that require a combination of high hardness and toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Mechanics
Scott E. Julien, Ahmad Nourian-Avval, Wentao Liang, Tricia Schwartz, Ozan C. Ozdemir, Sinan Muftu
Summary: This study investigated the tensile and fracture anisotropy in helium-sprayed bulk Al 6061 cold spray deposits. The results showed no in-plane anisotropy in tensile properties, while the fracture toughness exhibited mild transverse isotropy. The low level of anisotropy was attributed to effective spray parameters and the usage of helium gas, ensuring good interparticle bonding.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Ada Amendola, Giuseppe Saccomandi, Emanuela Speranzini
Summary: This study investigates the propagation of shear waves in an anisotropic incompressible medium composed of an elastic fiber-reinforced material. The determining equations for such motions are derived, and the nonlinearity of the dynamic problem is attributed to the presence of reinforcing fibers. An asymptotic model is considered for waves with finite but small amplitude. The results show that the material behaves isotropically when the fibers are arranged along the direction of wave propagation. However, when the fibers are tilted, a peculiar mixed second-/third-order nonlinearity is observed for small tilting angles, while a quadratic nonlinearity is sufficient for larger tilting angles. The study's findings are fundamental for understanding the dynamics of fiber-reinforced materials, including dissipative and/or dispersive effects.
MATHEMATICS AND MECHANICS OF SOLIDS
(2023)
Article
Mechanics
Ada Amendola
Summary: This paper presents an analytic study on the existence and properties of solitary waves on 1D chains of lumped masses and nonlinear springs, which exhibit a mechanical response similar to that of tensegrity prisms. The study shows that the shape of the waves depends on the wave speed, and a progressive localization of the traveling pulses in narrow regions of space is observed as the wave speed increases up to a limit value. Comparative analysis confirms that the presented study captures the wave dynamics observed in previous numerical studies on tensegrity mass-spring chains.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2023)
Article
Mechanics
Ada Amendola, Vittorio Zampoli, Raimondo Luciano
Summary: This paper discusses the modeling problem of nanobeams that dissipate thermal energy by radiation. The behavior of nonlocal nanobeams based on Euler-Bernoulli assumptions in a one-dimensional case is studied. With these assumptions, a thermoelastic model that considers the effects of thermal energy radiation to the external environment is proposed, using an extension of the GN-II theory. Wave-form solutions are used to further analyze the formulated theoretical model and highlight the presence of dissipative effects.
Article
Mechanics
Y. Zhu, A. Fascetti, L. Feo, A. S. Mosallam, R. Penna
Summary: The research focuses on the experimental characterization and numerical simulation of pultruded Glass Fiber-Reinforced Polymer (GFRP) structural elements, specifically on enhancing the ultimate capacity of Web-Flange Junctions (WFJs). The study includes an experimental campaign on as-manufactured I-beam specimens and a numerical investigation on different stiffeners' arrangements. The results demonstrate the importance of external stiffeners in improving the strength and stiffness of GFRP I-beams.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Ada Amendola, Antonio Fortunato, Fernando Fraternali, Ornella Mattei, Graeme W. Milton, Pierre Seppecher
Summary: This study generalizes previous research on tension cable networks and compression support grids, and applies them to the design of masonry structures and spider web-inspired structures.
MATHEMATICS AND MECHANICS OF SOLIDS
(2023)
Article
Multidisciplinary Sciences
Ada Amendola, Ornella Mattei, Graeme W. Milton, Pierre Seppecher
Summary: This paper discusses how to design suitable support structures in masonry structures to support specified point forces and avoid certain obstacles. By approximating the obstacles, the problem can be reduced to a linear programming problem. The paper focuses on the two-dimensional case, studying the forces at the vertices of convex polygons and considering both single and multiple obstacles, as well as the case of reactive forces.
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Review
Nanoscience & Nanotechnology
Anastasiia O. Krushynska, Daniel Torrent, Alejandro M. Aragon, Raffaele Ardito, Osama R. Bilal, Bernard Bonello, Federico Bosia, Yi Chen, Johan Christensen, Andrea Colombi, Steven A. Cummer, Bahram Djafari-Rouhani, Fernando Fraternali, Pavel I. Galich, Pedro David Garcia, Jean-Philippe Groby, Sebastien Guenneau, Michael R. Haberman, Mahmoud I. Hussein, Shahram Janbaz, Noe Jimenez, Abdelkrim Khelif, Vincent Laude, Mohammad J. Mirzaali, Pawel Packo, Antonio Palermo, Yan Pennec, Ruben Pico, Maria Rosendo Lopez, Stephan Rudykh, Marc Serra-Garcia, Clivia M. Sotomayor Torres, Timothy A. Starkey, Vincent Tournat, Oliver B. Wright
Summary: This review article provides a summary of recent advances and hot research topics in nanophononics and elastic, acoustic, and mechanical metamaterials based on the authors' presentations at the EUROMECH 610 Colloquium. Unlike a conventional review, it focuses on the state-of-the-art and emerging research directions in these fields rather than historical viewpoints. The article covers basic definitions, design strategies, analysis techniques, and discussions of challenges and applications in each topic, offering valuable insights for early-career researchers and others interested in these areas.
Article
Chemistry, Physical
Francesco Todaro, Francesco Colangelo, Sabino De Gisi, Ilenia Farina, Claudio Ferone, Claudia Labianca, Andrea Petrella, Raffaele Cioffi, Michele Notarnicola
Summary: This research proposes a cement-free cold granulation process for the remediation of contaminated marine sediments and the production of low-cost aggregates for civil engineering. The use of industrial by-products, coal fly ash and Blast Furnace Slag, as geopolymer precursors in the granulation process was investigated. The results showed that sediments treated with a specific mix design had optimal metal leachability and meet the technical requirements for pavement construction. Cold granulation was found to be a sustainable solution for recycling contaminated sediments and industrial by-products into lightweight artificial aggregates.
Article
Mechanics
Fernando Fraternali, Julia de Castro Motta
Summary: This study focuses on the use of tensegrity bracing systems as energy dissipation devices in earthquake-proof timber buildings. The structures consist of lightweight and high-strength timber members and pretensioned elements with a superelastic response. The results show the bi-directional response and the effects of pretension on the mechanical response of the structure, with a comparison of different bracing systems in a full-scale glued laminated timber frame.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Editorial Material
Mechanics
Fernando Fraternali, Anthony D. Rosato
MECHANICS RESEARCH COMMUNICATIONS
(2023)
Review
Green & Sustainable Science & Technology
Narinder Singh, Francesco Colangelo, Ilenia Farina
Summary: This review article discusses the system materials for concrete 2D printing and various aspects related to sustainable construction. The article highlights the potential of 3D printing in reducing waste generation and compares the cost and effectiveness of conventional and non-conventional construction methods. It also explores the application of 3D printing in the building sector and discusses the challenges and future prospects of this technology.
Article
Construction & Building Technology
Saeedeh Qaderi, Valentina Adinolfi, Giovanni Germano, Gianmario Benzoni, Raimondo Luciano, Fernando Fraternali
Summary: This paper presents a novel two-layer sliding-stretching isolator that can protect buildings and infrastructure from seismic waves. By adjusting the elongation and contraction of tendons, the device can recenter the system and avoid resonance with earthquake frequencies. Shake-table tests on prototypes demonstrate the potential of this two-layer device for real-life applications in multistory buildings.
Article
Engineering, Civil
Giovanni Germano, Saeedeh Qaderi, Valentina Adinolfi, Julia De Castro Motta, Gianmario Benzoni, Ada Amendola, Massimo Ruzzene, Fernando Fraternali
Summary: This work presents procedures and methods for designing, assembling, modeling, and validating a shake-table setup built in-house at the University of Salerno. The setup allows for experimental characterization of seismic protection devices and studies on earthquake-proof structures. Its unique features include the ability to apply various large lateral displacement histories, high vertical loads, and achieve high peak velocities of horizontal motion.
INGEGNERIA SISMICA
(2023)
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)
