Article
Polymer Science
Aldobenedetto Zotti, Simona Zuppolini, Anna Borriello, Valeria Vinti, Luigi Trinchillo, Domenico Borrelli, Antonio Caraviello, Mauro Zarrelli
Summary: This study investigates the effect of different mixing techniques on the thermal and mechanical properties of graphene nanoplatelets and graphene nanofibers loaded epoxy nanocomposites. Results show that ultrasonication and fluidized bed method achieve the most suitable dispersion, resulting in nanocomposites with the largest increase in glass transition temperature. The fracture toughness of the nanocomposites is improved due to the homogeneity and low scale dispersion of the carbonaceous nanostructures. The fluidized bed method is found to be the most suitable for high volume industrial production. Carbon fiber reinforced composites manufactured using this method demonstrate improved tensile, flexural, and interlaminar fracture toughness properties.
Article
Mechanics
C. Kostagiannakopoulou, T. H. Loutas, G. Sotiriadis, V Kostopoulos
Summary: This research paper investigates the impact of aspect ratio and specific surface area of Graphene Nano-Platelets on the interlaminar fracture behavior of carbon fiber-reinforced polymer composites. The study found that GNPs with higher aspect ratios and specific surface areas lead to improved interlaminar fracture toughness under both Mode I and Mode II loading compared to unmodified composites.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Multidisciplinary
Daniel W. Mulqueen, Siavash Sattar, Oleksandr G. Kravchenko
Summary: In this study, the mechanisms of graphene reinforcement in CFRP and its effects on mechanical strength, resistance to crack propagation, and thermal conductivity at elevated temperatures were examined. Plant-based graphene nanoplatelets (pGNP) were applied to unidirectional carbon fiber/epoxy prepreg, resulting in an interlaminar nanocomposite. The restrictions on polymer side chain movement due to crosslinking with graphene surface groups improved the composite performance, extending the damage process zone and increasing fracture toughness. Interlaminar pGNP significantly improved fracture toughness under Mode I and Mode II conditions at elevated temperatures.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Materials Science, Composites
Jalal Nasser, Lisha Zhang, Henry Sodano
Summary: The introduction of vertically aligned, laser-induced graphene (LIG) forests has been shown to significantly improve the interlaminar properties of carbon fiber reinforced composites, enhancing their fracture toughness. This improvement method is simple and convenient, effectively enhancing the performance of carbon fiber composites.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Polymer Science
Evanthia J. Pappa, James A. Quinn, James J. Murray, James R. Davidson, Conchur M. Bradaigh, Edward D. McCarthy
Summary: In this study, single polymer films of thermoplastic polyurethane (PU) and adhesive epoxy featuring a polyester net were inserted into a composite laminate to examine their toughening effects on mechanical properties. The introduction of a single PU film resulted in a significant increase of approximately 290% in mode I toughness and 50% in mode II toughness. Similarly, the epoxy film improved interlaminar fracture properties, with the CC process showing a 175% increase and the SB adhesive film showing a 75% increase in mode II toughness.
Article
Materials Science, Composites
M. A. Umarfarooq, P. S. Shivakumar Gouda, N. R. Banapurmath, M. I. Kittur, Tabrej Khan, Bisma Parveez, Tamer A. Sebaey, Irfan Anjum Badruddin
Summary: Failure by delamination is a significant concern in laminated composites, as it leads to degradation of stiffness and potential structural failure. Knowledge of delamination resistance and influencing factors is crucial for material selection. This study investigates the effect of fiber hybridization and post-curing on the interlaminar fracture toughness of Glass/Carbon/Epoxy composites. The hybrid GCE laminates exhibit higher fracture toughness, attributed to the synergistic effect of Carbon and Glass fibers. Post-curing at 180 degrees C also improves fracture toughness.
POLYMER COMPOSITES
(2023)
Article
Chemistry, Multidisciplinary
Burak Yenigun, Muhammad Salman Chaudhry, Elli Gkouti, Aleksander Czekanski
Summary: This study investigates the influence of temperature and loading rate on the interlaminar fracture behavior of CNT-CFRP. The results show that the fracture toughness of CNT-CFRP increases with increasing amount of CNT, but decreases at higher CNT amounts. The fracture toughness also increases with the loading rate in both Mode I and Mode II. As for temperature, Mode I fracture toughness increases with temperature while Mode II fracture toughness increases up to room temperature and then decreases.
Article
Materials Science, Multidisciplinary
Milad Kheyrollazadeh, Zohre Balak, Mahdi Azizieh, Mehdi Shahedi Asl
Summary: This experiment investigates the effect of TaC addition on the microstructure, densification, and mechanical properties of ZrB2 composites reinforced with graphene nanoplatelets (GNP). The results show that the presence of GNP, alone and combined with TaC, significantly increases the relative density. Full densification is achieved by adding 10 and 20 vol% TaC. ZrB2-GNP and ZrB2-GNP doped with 10 vol% TaC exhibit high flexural strength and fracture toughness.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Construction & Building Technology
Sreekumaran Sreenath, Kaliyaperumal Saravana Raja Mohan, Gunasekaran Murali
Summary: This study investigates the effect of GGBS on the fracture toughness of RPCs under different fracture modes, and finds that incorporating GGBS and fibers can significantly improve the fracture toughness of RPCs.
Article
Materials Science, Characterization & Testing
Chenglin Han, Hongxing Zhao, Tianzhi Yang, Xueqing Liu, Mingchi Yu, Gong-Dong Wang
Summary: This study utilizes machine learning to build a fast and accurate predictive model, assessing the extent to which key features affect performance and providing ideas for designing new materials and improving efficiency.
Article
Mechanics
A. Gliszczynski, N. Wiacek
Summary: This paper discusses experimental and numerical analysis of the ENF test of GRFP unidirectional laminates. The use of VCCT and CZM methods for modelling the fracture zone under mode II shear loading has shown the superiority of CZM over VCCT in terms of applicability for coarse meshes, convergence of results, shorter CPU time, and no need for initial delamination front assumption.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Composites
Kanokporn Tangthana-umrung, Matthieu Gresil
Summary: Healable and recyclable fibre reinforced vitrimer composites have been developed, which exhibit superior mechanical and interlaminar fracture properties. The findings reveal the potential for further development of vitrimer CFRP composites for advanced applications.
COMPOSITES COMMUNICATIONS
(2022)
Article
Engineering, Multidisciplinary
Jiahe Ma, Qiang Xu, Weidong Zhu, Yinglin Ke
Summary: This study introduces a low-cost and high-performance reinforcement method for CFRP products. By using a translaminar enveloping technique, interlocking and binding actions are introduced into conventional lay-ups. Experimental results show significant improvements in fracture toughness in both mode I and mode II. The study also reveals the evolution of interlaminar toughening behaviors.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Engineering, Chemical
Jojibabu Panta, Y. X. Zhang, Andrew N. Rider, John Wang
Summary: In this study, the mechanical and fracture performance of a newly developed high-performance nano composite adhesive was experimentally characterized. The results showed that the addition of ozone-functionalized graphene nanoplatelets and triblock copolymers greatly improved the lap shear strength and ultimate shear strain of the adhesive joints, while slightly reducing the tensile butt joint strength. Furthermore, the incorporation of nanomaterials significantly increased the fracture toughness of the adhesive.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2022)
Article
Chemistry, Analytical
Panagiota T. Dalla, Ilias K. Tragazikis, George Trakakis, Costas Galiotis, Konstantinos G. Dassios, Theodore E. Matikas
Summary: Recent findings suggest that carbon nano-species, such as nanotubes and graphene, have the potential to improve the multifunctional properties of cement, including mechanical, fracture mechanical, and electrical properties. Testing on mortars modified with graphene nanoplatelets and carbon nanotubes showed significant improvements in fracture behavior at specific nanofiller concentrations, indicating great potential for smart construction applications.
Article
Engineering, Mechanical
Zohreh Asaee, Farid Taheri
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2019)
Review
Chemistry, Multidisciplinary
Davide De Cicco, Zohreh Asaee, Farid Taheri
Article
Materials Science, Multidisciplinary
Zohreh Asaee, Farid Taheri
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2020)
Article
Engineering, Mechanical
Davide De Cicco, Farid Taheri
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2020)
Article
Engineering, Mechanical
Mbarka Mohamed, Farid Taheri
JOURNAL OF STRAIN ANALYSIS FOR ENGINEERING DESIGN
(2018)
Article
Chemistry, Multidisciplinary
Davide De Cicco, Farid Taheri
APPLIED SCIENCES-BASEL
(2018)
Article
Metallurgy & Metallurgical Engineering
Davide De Cicco, Farid Taheri
JOURNAL OF MAGNESIUM AND ALLOYS
(2019)
Article
Chemistry, Multidisciplinary
Davide De Cicco, Farid Taheri
Article
Mechanics
Davide De Cicco, Farid Taheri
COMPOSITE STRUCTURES
(2019)
Article
Engineering, Mechanical
B. Soltannia, P. Mertiny, F. Taheri
Summary: The research aims to explore the parameters affecting the frequency response of three-dimensional fiber metal laminates and experimentally investigates the vibration characteristics of different configurations. Results show that adding nanocarbon particles can improve material damping significantly.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2021)
Article
Engineering, Multidisciplinary
Fatemeh Mottaghian, Hessameddin Yaghoobi, Farid Taheri
COMPOSITES PART B-ENGINEERING
(2020)
Article
Engineering, Mechanical
Hessameddin Yaghoobi, Farid Taheri
Summary: The study analyzed the free vibration, buckling, and deformation responses of simply-supported sandwich plates constructed with graphene-reinforced polymer composite face sheets. The temperature-dependent material properties of the face sheets were estimated using a modified micromechanical model, and the governing differential equations were solved analytically. Numerical case studies revealed significant influences of parameters such as core to face sheet thickness ratio, temperature variation, foundation type, and graphene volume fraction on the plate responses.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
B. Soltannia, K. Duke, F. Taheri, P. Mertiny
REVIEWS OF ADHESION AND ADHESIVES
(2020)
Article
Mechanics
Hessameddin Yaghoobi, Farid Taheri
COMPOSITE STRUCTURES
(2020)
Article
Materials Science, Multidisciplinary
Davide De Cicco, Farid Taheri
Article
Mechanics
Xiaolong Liu, Kelian Luo, Pengcheng Gao, Tao Cong, Xi Wang, Wenjing Wang
Summary: This paper investigates the formation mechanisms of the zig-zag crack region on the shattered rim of railway wheels. The zig-zag crack region, identified as a typical region for crack propagation in rolling contact fatigue behavior, was observed using scanning electron microscopy and transmission electron microscopy. The formation of the zig-zag morphology is attributed to the periodic deflection of the propagation path relative to the initial propagation plane, caused by the limited plastic deformation zone at the crack tip. Grain refinement and secondary cracks in the zig-zag crack region are a result of the large compressive and shear stresses induced by rolling contact loading.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Anastasia Iziumova, Aleksei Vshivkov, Ivan Panteleev, Virginia Mubassarova, Oleg Plekhov, Denis Davydov
Summary: The aim of this study was to investigate the correlation between structural, acoustic emission, and thermal characteristics of fatigue crack growth in titanium alloys. Cluster analysis of the acoustic emission signals revealed two different types of signals observed during the fatigue crack development. It was experimentally demonstrated that the stored energy tends to reach an asymptotic value at the final stage of fatigue crack growth and this is correlated with the twinning process intensification in titanium alloy Ti Grade 2. A correlation was assumed between the stages of change in heat flux, the cumulative energy of the first cluster of acoustic emission signals, and the crack length.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
M. Vieira de Carvalho, I. A. Rodrigues Lopes, F. M. Andrade Pires
Summary: This study investigates the numerical challenges of fracture mechanics models within implicit quasi-static frameworks and proposes an instability criterion. The ratio of cohesive to internal power is identified as a crucial factor. Two strategies for handling fracture problems with instabilities are discussed and a comparative assessment is performed. The study also examines more complex material responses, including transformation-induced plasticity effects.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Thomas Duminy, Aurelien Doitrand, Sylvain Meille
Summary: This study conducted in situ wedge splitting tests on millimeter-size PMMA samples and proposed a method to determine the material tensile strength and critical energy release rate using digital image correlation and a full finite element implementation of the coupled criterion.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Xin Chang, Xingyi Wang, Chunhe Yang, Yintong Guo, Yanghui Wan
Summary: The influence of cyclic thermal shock and high-temperature acid etching on the Mode I fracture of shale was investigated in this study. It was found that cyclic thermal shock severely degrades the strength and fracture toughness of shale, while high-temperature acid etching treatment improves the fracture toughness. These findings are valuable for optimizing process parameters to reduce initiation pressure in deep shale formations.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Liaojun Yao, Mingyue Chuai, Zhangming Lyu, Xiangming Chen, Licheng Guo, R. C. Alderliesten
Summary: Methods based on fracture mechanics have been widely used in fatigue delamination growth (FDG) characterization of composite laminates. This study proposes appropriate similitude parameters to represent FDG behavior with different R-ratios.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Zesheng Zang, Zhonghui Li, Yue Niu, Shan Yin
Summary: This study conducted experiments and recorded signals to investigate the fracture behavior and damage evolution characteristics of coal samples. The results showed that as loading proceeds, the stress, electric potential (EP), and acoustic emission (AE) values increase, and EP and AE signals are excited when stress drops. The fracture behavior of coal samples is altered by flaw inclination, and the destruction mode becomes increasingly complicated. The damage evolution characteristics of coal samples can be evaluated and analyzed by defining the coefficient of variation (CV value) of EP and the b value of AE.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Clotilde Berdin, Nathalie Prud'homme
Summary: In this study, zirconia layers with different fractions of tetragonal phase and thicknesses were tested for multi-cracking behavior. Cracks perpendicular to the tensile direction were observed, showing a blunting effect into the substrate. The ratio of crack spacing at saturation to layer thickness decreased as the layer thickness increased. Unit cell modeling was used to establish a relationship between crack spacing and layer strength, which fell within the bounds of Hu and Evans model and was found to be insensitive to the tetragonal zirconia fraction.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Huadong Zhang, Weichen Kong, Y. H. Liu, Yuh J. Chao
Summary: Williams' series expansion crack tip solution in linear elasticity is modified to include a uniform crack face pressure. Practical methods to calculate T-stress from near crack tip stresses are outlined. The analytical results are consistent with numerical results.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Jiahao Kong, Haoyue Han, Tao Wang, Guangyan Huang, Zhuo Zhuang
Summary: This paper introduces a phase-field model for polymer foam materials by combining the phase-field method with the crushable foam model. The model is calibrated using experimental data and successfully simulates the fracture processes of polyurethane under different loading conditions. The study is important for the engineering applications of polymer foam materials.
ENGINEERING FRACTURE MECHANICS
(2024)
