Article
Chemistry, Physical
Phani Prasanthi, Sivaji Babu Kondapalli, Niranjan Kumar Sita Rama Morampudi, Venkata Venu Madhav Vallabhaneni, Kuldeep Kumar Saxena, Kahtan Adnan Mohammed, Emanoil Linul, Chander Prakash, Dharam Buddhi
Summary: A two-stage micromechanics technique was used to predict the elastic modulus and Poisson's ratio of unidirectional natural fiber reinforced composites. The study emphasized the importance of considering the real microstructure of natural fibers in the design of composites, particularly at higher volume fractions. The results showed the significance of hierarchical structures of fibers in determining the elastic properties of the composite materials.
Article
Construction & Building Technology
Chuntao Zhang, Yanyan Li, Junjie Wu
Summary: A study was conducted on the mechanical properties of nanometer montmorillonite composite fiber material at high temperatures. The results showed that elevated temperatures significantly affected the residual mechanical properties of fiber-reinforced polymer composites, with a noticeable decrease above 200 degrees C. Additionally, the ultimate load of the composites significantly increased between 200 and 300 degrees C.
Review
Engineering, Multidisciplinary
Janet Wong, Abdulmajeed Altassan, David W. Rosen
Summary: Additive manufacturing (AM) of fiber-reinforced composites is an important technology for producing complex and customized structures. AM processes allow for the fabrication of 3D structures with control over fiber position and orientation. However, there are design difficulties that need to be considered, such as manufacturing constraints and limitations on fiber placement and orientation. This paper provides a survey on the advances in multi-scale topology optimization, fiber orientation parameterization, micromechanics of fiber-matrix interactions, and process planning specific to the AM of complex fiber reinforced composites, summarizing recent research and outlining future directions.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Engineering, Civil
Alessio Cascardi, Francesco Micelli, Maria Antonietta Aiello
Summary: This research proposes an innovative construction method for strengthening existing arches to prevent collapse under static or seismic force. The method utilizes fiber-reinforced polymer (FRP) to connect the blocks that form the arch. Experimental results demonstrate that the novel technique significantly enhances the loadbearing capacity compared to traditional reinforced arches.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2023)
Review
Engineering, Multidisciplinary
Wenqin Han, Jinyu Zhou, Qinghe Shi
Summary: This review summarizes recent advancements in mechanical properties of fiber-reinforced polymer composites using graphene and carbon nanotubes (CNTs). The synthesis methods for incorporating graphene and CNTs into the composites are discussed, along with their effects on interfacial shear strength, interlaminar shear strength, interlaminar fracture toughness, and fatigue characteristics. Various reinforcement mechanisms, including wettability, mechanical interlocking, chemical bonding, and transition layer, are analyzed. The review also covers modeling and analysis tools used for studying these materials, such as molecular dynamics and finite element methods.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Materials Science, Composites
D. Mocerino, M. Bruno, M. A. Monclus, D. Garoz Gomez, M. Rueda-Ruiz, J. M. Molina-Aldareguia, M. Flores, C. Gonzalez
Summary: This paper proposes a novel in-situ experimental approach using micro-cantilever tests to characterize the interface of a carbon-epoxy unidirectional composite system. Computational models were implemented to validate the experimental results and investigate the interface debonding behavior under different damage modes. The validated model can effectively assess the proposed experimental approach in interface characterization. Overall, this approach provides a valuable tool for studying fiber-reinforced polymers and contributes to the development of more accurate predictive models.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Qinglin Gao, Haohui Xin, Ayman S. Mosallam, Filippo Berto, Jose A. F. O. Correia
Summary: This paper focuses on the impact of mean stress on fatigue life in the design of FRP structures. A revision term is proposed to consider the effects of mean stress, and a probability evaluation method is introduced using Markov chain Monte Carlo and Bayesian inference to predict the probabilistic fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Mechanics
Ahmed Elmasry, Wiyao Azoti, Ahmed Elmarakbi
Summary: Light-weighting for energy efficiency without sacrificing safety and performance is a key focus in the automotive industry. This study develops a method to study the application of hierarchical fibres/graphene nanoplatelets-reinforced polymer matrix composites using both one-site and multi-site modelling. The applicability of these models is assessed for automotive crashworthiness under mechanical and rate-dependent plasticity or viscoplasticity behaviors.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Civil
Shahzad Saleem, Amorn Pimanmas, Muhammad Irshad Qureshi, Winyu Rattanapitikon
Summary: The study aims to observe the influence of internal steel bars on the axial compressive response of noncircular RC column specimens confined with PET FRP. Test results show that the strength and deformation capacities of the confined specimens were significantly affected by the parameters considered, and PET FRP effectively restrained stress concentrations at the corners of bar buckling.
JOURNAL OF COMPOSITES FOR CONSTRUCTION
(2021)
Article
Materials Science, Composites
Ravi Shankar Rai, Vivek Bajpai
Summary: Hydrothermal technique was used to deposit CuO nanostructures on woven carbon fibers (WCF) to enhance the mechanical properties of epoxy resin composites. The results indicated that the CuO-coated WCF reinforced epoxy resin composites exhibited improved impact strength, tensile strength, and in-plane shear strength.
POLYMER COMPOSITES
(2023)
Article
Mechanics
Cheng Chen, Xue Li, Caiwei Li, Yingwu Zhou, Lili Sui
Summary: This study proposed a novel method to optimize flax fiber reinforced polymer (FRP) production and its application in reinforced concrete (RC) beams, showing that optimized flax FRP stirrups can reduce environmental impact intensity, while partially bonded flax FRP stirrups demonstrate significant improvements in most environmental impact categories.
COMPOSITE STRUCTURES
(2022)
Article
Polymer Science
Maojun Duan, Yu Tang, Yusheng Wang, Yang Wei, Jiaqing Wang
Summary: This study found that the post-yield stiffness of SFCBs is higher when confined with high elastic modulus CFRP composite. Decreasing confinement spacing did not significantly improve the compressive strength of SFCBs in concrete cylinders. Design equations should consider the actual compressive stress of SFCBs to provide the most accurate prediction of load-carrying capacity.
Article
Construction & Building Technology
Yang Yang, Cheng Xu, Liujia Xia, Qiyu Tao
Summary: The main objective of this research was to address the issue of closed-loop created in the steel truss of the ballastless track slab by proposing and fabricating a new type of FRP truss. However, the mechanical performance of the sleepers reinforced by this new truss under the stacking condition was uncertain. To investigate this, five different types of truss reinforced sleepers were fabricated and tested in a compressive test. The results showed that the new FRP truss reinforced sleepers still possessed sufficient stiffness and bearing capacity compared to traditional sleepers, with the hand-made FRP joints offering both high strength and early warning of joint failure.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Multidisciplinary
Yan-Ni Rao, Qi He, Hong-Liang Dai
Summary: This paper presents a novel prediction scheme for effective stiffness, coefficient of thermal expansions (CTEs), and coefficient of moisture expansions (CMEs) of FRCs with functionally graded interphase (FGI). Multiple methods and analytical expressions were used, and a two-step homogenization technique was performed for filler distribution consideration in the analysis.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Mechanics
Li Tian, Guannan Wang, Haitao Zhao, Mingqing Yuan, Yahui Peng, Ji'an Chen
Summary: A novel multiscale semi-analytical model is proposed to study the thermal conductive behaviors of carbon nanotube-reinforced composites, demonstrating significant enhancement of transverse thermal conductivity in CFRCs and minimal impact on longitudinal thermal conductivity due to CNT coating. The model is validated against available simulations and finite element method, and localized heat-flux/temperature distributions are recovered to predict crack initiations within microstructures.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Ceramics
Markos Petousis, Nectarios Vidakis, Nikolaos Mountakis, Amalia Moutsopoulou, Vassilis Papadakis, Emmanuel Maravelakis
Summary: Titanium nitride (TiN) nanoparticles were introduced into polylactic acid (PLA) thermoplastic through a thermomechanical process to produce nanocomposites for MEX 3DP 3D printing. The addition of 4 wt% TiN resulted in a significant improvement in the mechanical properties of PLA, with a 43.4% increase in tensile strength and a 51.5% increase in flexural strength. The cost-effectiveness of the process was also evaluated and found to be favorable.
CERAMICS INTERNATIONAL
(2023)
Article
Automation & Control Systems
Nectarios Vidakis, Markos Petousis, Nikolaos Mountakis, John D. D. Kechagias
Summary: This study investigates the weldability of Polyamide 6 (PA6) plates, produced by 3D printing using material extrusion (MEX), with Friction Stir Welding (FSW). The feasibility of joining 3D printed PA6 with FSW was confirmed through experimental optimization and analysis. The results of this study provide valuable insights and advantages for welding processes in various industrial applications.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Polymer Science
Nectarios Vidakis, Markos Petousis, Nikolaos Mountakis, Constantine N. David, Dimitrios Sagris, Subrata C. Das
Summary: Sustainability is crucial in today's world due to the rising usage of polymers. Mechanical recycling of polymers, involving grinding/shredding and thermal extrusion, can negatively impact the mechanical performance and introduce contamination. This study investigates the response of Thermoplastic Polyurethane (TPU) in material extrusion (MEX) 3D printing after multiple recycling cycles. The results show that TPU mechanical recycling is a viable option, with the highest tensile strength observed in the sixth repetition of thermal reprocessing.
POLYMER DEGRADATION AND STABILITY
(2023)
Article
Engineering, Manufacturing
Nectarios Vidakis, Markos Petousis, Constantine N. David, Dimitrios Sagris, Nikolaos Mountakis, Emmanuel Karapidakis
Summary: This paper investigates the impact of seven control parameters on the energy consumption and compressive performance of polycarbonates in material extrusion additive manufacturing. The study identifies the most significant factors affecting energy consumption and compressive strength, and establishes quadratic regression models for each response metric.
JOURNAL OF MANUFACTURING AND MATERIALS PROCESSING
(2023)
Article
Mechanics
Nectarios Vidakis, Markos Petousis, Emmanuel Velidakis, Nikolaos Mountakis, Sotirios Grammatikos, Lazaros Tzounis
Summary: Carbon black modified polyamide 12 nanocomposites were prepared with different filler weight ratios. The filaments obtained through thermomechanical extrusion were used to fabricate electrothermally conductive nanocomposites via 3D printing. Mechanical properties, electrical conductivity, fracture mechanisms, and antibacterial response were investigated. The nanocomposites showed multifunctional behavior suitable for various applications.
COMPOSITE STRUCTURES
(2023)
Article
Automation & Control Systems
Markos Petousis, Nectarios Vidakis, Nikolaos Mountakis, Emmanuel Karapidakis, Amalia Moutsopoulou
Summary: This study investigates the effect of seven generic control parameters on the performance and energy consumption of 3D-printed ABS parts. The layer thickness is found to be the most critical parameter, while nozzle temperature and raster deposition angle are less critical. This research provides reliable information with significant technological and industrial impact.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Engineering, Biomedical
Nectarios Vidakis, Markos Petousis, Nikolaos Mountakis, Vassilis Papadakis, Amalia Moutsopoulou
Summary: The efficacy of three modeling methods (full factorial, Taguchi, Box-Behnken) on the performance of MEX 3D printed nanocomposites was investigated in order to reduce experimental effort. The results showed that a mixture of 3% CNF, 270°C nozzle temperature, and 80°C bed temperature led to a 24% increase in tensile strength in the medical-grade PA12 reinforced with CNF. The Taguchi and Box-Behnken methods required only 7.4% and 11.8% of the experimental effort of the full factorial method, respectively.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Markos Petousis, Nikolaos Michailidis, Vassilis M. Papadakis, Apostolos Korlos, Nikolaos Mountakis, Apostolos Argyros, Evgenia Dimitriou, Chrysa Charou, Amalia Moutsopoulou, Nectarios Vidakis
Summary: The aim of this research was to investigate the thermomechanical properties of new nanocomposites in additive manufacturing (AM). Material extrusion (MEX) 3D printing was used to fabricate ABS nanocomposites with silicon nitride nano-inclusions. Standard tests were conducted to evaluate the influence of Si3N4 nanofiller content on the mechanical and thermal response of the printed samples. The results showed that silicon nitride nanoparticles significantly enhanced the mechanical properties of the polymer matrix.
Article
Chemistry, Multidisciplinary
Nectarios Vidakis, Markos Petousis, Nikolaos Mountakis, Vassilis Papadakis, Chrysa Charou, Vasilis Rousos, Pavlos Bastas
Summary: The demand for functional filaments made of bio-sourced, biocompatible, biodegradable, and/or recyclable polymers and composites for 3D printing is increasing in the industry. This study focused on the reinforcement of polylactic acid (PLA) filament with glass fillers in different forms. Various concentrations of glass in powder, beads, and flake forms were used to optimize the composite filaments. The mechanical response of the composites was evaluated through thermogravimetric analysis, Raman spectroscopy, and 3D printing of specimens for testing.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Multidisciplinary
Nectarios Vidakis, Constantine David, Markos Petousis, Dimitrios Sagris, Nikolaos Mountakis
Summary: Additive Manufacturing (AM) is a cost-effective manufacturing process that offers high flexibility and the capability to fabricate complex geometries. This study investigates the impact of six 3D printing control parameters on the quality of printed parts, and provides predictive equations for optimizing these parameters and improving printing quality.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Ceramics
Nectarios Vidakis, Amalia Moutsopoulou, Markos Petousis, Nikolaos Michailidis, Chrysa Charou, Vassilis Papadakis, Nikolaos Mountakis, Evgenia Dimitriou, Apostolos Argyros
Summary: This study investigates the potential of tungsten carbide as a reinforcement and stabilizing agent in material extrusion (MEX) 3D printing. The experiments demonstrate that WC nanoparticles significantly enhance the mechanical performance of nanocomposites, with good thermal stability and processability, making them suitable for applications requiring high wear resistance.
CERAMICS INTERNATIONAL
(2023)
Article
Automation & Control Systems
Nectarios Vidakis, Nikolaos Mountakis, Amalia Moutsopoulou, Constantine David, Nektarios K. Nasikas, Markos Petousis
Summary: This study examines the weldability of 4 mm thick polycarbonate (PC) plates using friction stir welding (FSW). The effect of four control parameters (rotational speed, travel speed, weld tool shoulder, and pin diameter) on the geometrical characteristics and mechanical performance of the weld components is investigated. The results show that samples welded with 4 mm/min travel speed, 10 mm shoulder diameter, 1000 rpm rotational speed, and 3 mm pin diameter exhibit the highest mechanical performance.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Chemistry, Applied
Nectarios Vidakis, Markos Petousis, Nikolaos Michailidis, Nikolaos Mountakis, Vassilis Papadakis, Apostolos Argyros, Chrysa Charou
Summary: Nanocomposites consisting of polyamide 12 and silver nitrate were successfully prepared for additive manufacturing. The nanocomposites showed enhanced mechanical properties and antibacterial performance, making them suitable for medical and culinary applications. The addition of polyethylene glycol and polyvinylpyrrolidone as reduction agents during the chemical reaction improved the material's stiffness and biocidal activity against Escherichia coli and Staphylococcus aureus. The scalable process used in this study has the potential for industrial use.
REACTIVE & FUNCTIONAL POLYMERS
(2023)
Article
Chemistry, Multidisciplinary
Constantine David, Dimitrios Sagris, Markos Petousis, Nektarios K. Nasikas, Amalia Moutsopoulou, Evangelos Sfakiotakis, Nikolaos Mountakis, Chrysa Charou, Nectarios Vidakis
Summary: This study aims to predict and optimize the compressive strength and energy consumption in the material extrusion 3D printing process with Polyamide 6 polymer. The effects of seven control variables on energy demands and compressive responses were examined. The study provides an optimal compromise between mechanical strength and energy efficiency, with significant technological and economic benefits.
APPLIED SCIENCES-BASEL
(2023)
