Article
Mechanics
Sneha B. Cheryala, Chandra S. Yerramalli
Summary: The effect of hybridization on the growth of interface crack along the fiber is predicted. The study shows an enhancement in the compressive splitting strength with hybridization due to the lateral confinement effect on the interfacial crack.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2024)
Article
Chemistry, Multidisciplinary
Kunal Mishra, Raman P. Singh
Summary: Polyhedral oligomeric silsesquioxane (POSS) is a nanoscale reinforcement that can modify the mechanical, thermal, and chemical properties of thermosetting polymers, such as epoxy resin systems. The inclusion of POSS in epoxy resin at higher loading introduces ductility in the fracture behavior of nanocomposites. The J-integral is used to quantify the fracture behavior and characterizes the crack growth resistance curve. Different nanocomposites are prepared by adding varying amounts of glycidyl POSS into DGEBF epoxy resin, and the fracture toughness experiments show that the addition of POSS improves crack initiation toughness and changes the failure behavior due to the development of POSS-POSS compliant domains. The increase in fracture resistance at higher POSS loading is due to shear yielding, while the increased fracture toughness at lower POSS loading is due to crack pinning and deflection.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Composites
Jatupol Surakarnkha, Leong Zhaoyuan, Peng Gong, William Holmes, Pratik Desai, Joel Foreman, Nicola Morley
Summary: Carbon fibre reinforced polymer composites have superior properties and are increasingly used in industries like aerospace. Structural health monitoring is necessary due to their complex failure mechanisms. Magnetostrictive materials have been effective in damage detection but need improvement in spatial sensitivity. It is important to demonstrate ease of fabrication, damage detectability, and maintain a good weight-to-cost trade-off.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Review
Optics
J. Zhu, Z. Li, S. T. Yang, Y. R. Zhao, F. C. Lang, Y. M. Xing
Summary: In this study, the meso and nanoscopic deformation behavior of carbon-fiber reinforced resin matrix composites under tensile loading was investigated. In situ scanning electron microscopy combined with electron beam moire and geometric phase analysis techniques were used to measure and analyze the strain field distribution. A cross-grating with a pitch of 359 nm was fabricated on the surface of the composite material using electron beam lithography. The strain field distribution around different types of cracks and the ineffective length of broken fibers were characterized using geometric phase analysis.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Matthew J. Shafaq, Matthew J. Donough, Ashleigh L. Farnsworth, Andrew W. Phillips, Nigel A. St John, B. Gangadhara Prusty
Summary: Innovations in recycling, automated and out-of-autoclave processes have renewed significant interests in carbon fibre-polyether ether ketone (CF/PEEK) thermoplastic composites. The cooling rates during processing affect the crystallinity and fracture toughness of semi-crystalline thermoplastics. This study examines the influence of automated fibre placement (AFP) deposition rates on the crystallinity and fracture toughness of CF/PEEK composites and highlights the importance of good consolidation in improving fracture toughness performance.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Materials Science, Composites
Rui He, Longfei Cheng, Yidi Gao, Hao Cui, Yulong Li
Summary: This paper investigates the effect of in-plane shear stress on the fiber kinking compressive fracture toughness of laminates using compact compression specimens with off-axis fibers. The results show that in-plane shear stress increases the values of the R-curves, leading to an increase in energy dissipation. Microscopic morphology reveals the increasing splitting of fiber bundles and subsequent fiber compression failure as the off-axis angle of the fibers increases.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Composites
Sourav Kumar Mahapatra, Alok Satapathy
Summary: This investigation develops and characterizes a type of multi-phase hybrid composites made of bi-directional ramie fibers, epoxy resin, and micro-sized titania particles in different proportions. The composites are fabricated using the hand layup technique and subjected to physical, compositional, and mechanical characterization tests. The results show that the inclusion of titania particles improves the mechanical properties and hardness of the composites, making them potentially useful as functional materials in wear-prone situations.
POLYMER COMPOSITES
(2023)
Article
Engineering, Mechanical
Karolina Olszowska, Marcin Godzierz, Slawomira Pusz, Jerzy Myalski, Anastasiia Kobyliukh, Georgi Georgiev, Andrzej Posmyk, Boyko Tsyntsarski, Urszula Szeluga
Summary: The study investigated the influence of graphene nanoplatelets (GNPs) and carbon foam (CF) micrograins on the morphology and thermomechanical and tribological properties of epoxy composites. Binary composites containing either CF grains or GNPs and multiphase composites with CF particles and GNPs together were prepared using two different procedures. CF, when combined with GNPs, significantly improved the storage modulus, hardness, thermal stability, and reduced the friction coefficient and wear rate compared to the epoxy matrix. Among the two methods, the composite fabricated by the first method demonstrated superior tribological properties, especially under higher wear loads.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Mariana G. M. de Carvalho, Marcella Araujo Lage, Daniela de Figueiredo Cavalcante, Kioshy Santos de Assis, Andre Luiz Pinto, Cilene Labre, Fabio P. Alves, Oscar Rosa Mattos
Summary: The resistance of dissimilar joints to hydrogen was evaluated using fracture toughness and slow strain rate tests. The study found that the susceptibility to hydrogen embrittlement is directly linked to the fraction of discontinuous regions along the dissimilar interface.
Article
Engineering, Multidisciplinary
Zhongbin Tang, Chunyang Chen, Aijia Li, Yong Deng, Chao Zhang, Yulong Li
Summary: This study investigates the tensile failure behaviors of PEEK, short carbon, and glass-fiber-reinforced PEEK composites at different temperatures and strain rates. Quasi-static and dynamic tensile tests are conducted, and the fracture morphology is characterized by scanning electron microscopy. The results show that the tensile strength is highly influenced by temperature and strain rate. The failure strain of the composites is less sensitive to strain rate at -30 degrees C and 100 degrees C. Additionally, the energy absorptivity of PEEK composites decreases at extreme temperatures.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Engineering, Multidisciplinary
Thanasis Chatziathanasiou, Jeroen Soete, Johan Vanhulst, Delphine Carrella-Payan, Larissa Gorbatikh, Mahoor Mehdikhani
Summary: This paper reports the implementation of a methodology for in-situ 3D characterisation of the crack front in a double cantilever beam test using microfocus X-ray computed tomography. The crack initiation and propagation inside the bulk were determined through crack segmentation in the in-situ tomograms, allowing quantification of the fracture toughness without the need for artificially imposed initiation criteria such as the non-linearity.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Chemistry, Physical
Lucia Lattanzi, Andrea Etienne, Ziyu Li, Tushar Manjunath, Nirmal Nixon, Anders Eric Wollmar Jarfors, Samuel Ayowole Awe
Summary: This study investigates the effect of different additions of nickel and zirconium on the matrix alloy of Al-SiC metal matrix composites to enhance their high-temperature performance. The addition of nickel led to a continuous improvement in the mechanical response, while the addition of zirconium did not have the same effect.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Mechanics
Simon Laliberte-Riverin, Myriam Brochu
Summary: In this article, a novel method for measuring the stress intensity threshold for hydrogen embrittlement (K-th) in industrial plating conditions was developed. The method involved plating side-grooved CT samples in industrial plating baths and measuring K-th using an incremental step loading methodology. The method was validated with a benchmark case and used on a test case to quantify hydrogen embrittlement. The study concluded that delaying the post-plating bake did not cause hydrogen embrittlement in the studied conditions. The presence of side grooves on CT samples increased the sensitivity to hydrogen embrittlement compared to smooth samples.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Materials Science, Composites
Masao Kimura, Toshiki Watanabe, Sota Oshima, Yasuo Takeichi, Yasuhiro Niwa, Yuji Seryo, Masaki Hojo
Summary: This study investigates the nanoscale fracture mechanism in CFRPs using nanoscopic synchrotron radiation X-ray computed tomography. The results reveal the three steps involved in crack formation and the influence of fiber geometrical distributions on the resulting microstructures of cracks at the nanoscale.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Seyed Ali Delbari, Abbas Sabahi Namini, Maziyar Azadbeh, Zohre Ahmadi, Van-Huy Nguyen, Quyet Van Le, Mohammadreza Shokouhimehr, Mehdi Shahedi Asl, Mohsen Mohammadi
Summary: This study fabricated Ti-10 wt% Mo-1 wt% B4C composites using the SPS technique and investigated the effects of sintering temperature and dwell time on their microstructure and mechanical properties. A high relative density of 99.92% was achieved for the composites sintered at 1450 degrees C and further hot-rolled at 900 degrees C. X-ray analysis illustrated the formation of in-situ phases during the SPS process, while microstructural investigation confirmed the influence of sintering temperature and holding time on reducing porosity. Additionally, the post hot rolling at 900 degrees C was shown to modify the microstructure and activate the strengthening mechanism in the prepared composites.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Mechanics
Muhammad Akhsin Muflikhun, Ryo Higuchi, Tomohiro Yokozeki, Takahira Aoki
COMPOSITE STRUCTURES
(2020)
Article
Engineering, Multidisciplinary
Muhammad Akhsin Muflikhun, Ryo Higuchi, Tomohiro Yokozeki, Takahira Aoki
COMPOSITES PART B-ENGINEERING
(2020)
Article
Mechanics
Hitoshi Hamori, Hisashi Kumazawa, Ryo Higuchi, Tomohiro Yokozeki
COMPOSITE STRUCTURES
(2020)
Article
Materials Science, Composites
R. Higuchi, S. Warabi, W. Ishibashi, T. Okabe
COMPOSITES SCIENCE AND TECHNOLOGY
(2020)
Article
Engineering, Mechanical
Ryoma Aoki, Ryo Higuchi, Tomohiro Yokozeki
Summary: This study proposes a simulation method to evaluate fatigue progressive damage in composite laminates using intra-laminar and inter-laminar damage models, and the results show that the method can accurately predict stiffness degradation and the number of final failure cycles.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Manufacturing
Mio Sato, Kodai Hasegawa, Jun Koyanagi, Ryo Higuchi, Yuichi Ishida
Summary: A viscoelastic/plastic constitutive equation was proposed for viscoelastic media based on irreversible thermodynamics and viscoelastic theory. Uniaxial tensile tests on TriA-X polyimide resin at different temperatures and strain rates were conducted to determine material parameters. The proposed equation was applied to matrix resin using the FORTRAN programming language for numerical analysis, and transverse tensile failure analysis was performed on unidirectional CFRP under constant strain rate condition.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Engineering, Aerospace
Ibuki Hayashi, Ryo Higuchi, Tomohiro Yokozeki, Takahira Aoki
Summary: This study investigates the feasibility of an ultralight antenna structure for a preliminary radar satellite, focusing on thermal deformation and its impact on electromagnetic performance. By combining different theoretical models and methods, the effects of the geometry and structure of antenna components on the deformation of the entire antenna structure were studied, and design guidelines were proposed.
Article
Mechanics
Ryo Higuchi, Ibuki Hayashi, Tomohiro Yokozeki, Takahira Aoki
Summary: This study proposes a theory for predicting the deformation of laminates embedded or mounted with multiple inhomogeneous inclusions, combining Eshelby's equivalent inclusion method and Mori-Tanaka's mean-field method. The effectiveness of the proposed method is verified through analysis of a simple problem.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Mechanics
R. Higuchi, R. Aoki, S. Onodera, X. Lu, J. Zhi, K. H. Leong, T. Yokozeki, T. Okabe, T. E. Tay
Summary: In this study, a multi-fidelity fracture simulation scheme is developed for composite laminates. The scheme combines smeared crack models (SCMs) and discrete crack models (DCMs) to achieve a seamless transition and reduce computational cost while maintaining prediction accuracy. The proposed scheme is validated through simulation of open-hole tensile tests and comparison with experimental results.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Engineering, Manufacturing
Sota Oshima, Ryo Higuchi, Masaya Kato, Shu Minakuchi, Tomohiro Yokozeki, Takahira Aoki
Summary: This study investigated the effect of cooling rates on the crystallization, thermomechanical, and fracture properties of PPS and CF/PPS. The results showed that slow cooling rates led to high crystallinity, increasing the elastic modulus and yield stress but decreasing strength and fracture toughness. In neat resin, a transition from brittle to ductile fractures occurred between 1 and 10 degrees C/min, significantly increasing fracture toughness. However, CF/PPS fracture toughness was less affected by cooling rate and significantly lower than that of neat PPS due to weak fiber/matrix bonding.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Engineering, Mechanical
Jun Koyanagi, Asa Mochizuki, Ryo Higuchi, V. B. C. Tan, T. E. Tay
Summary: In this study, a novel model is developed to simulate the reductions in strength and fracture energy for carbon-fiber-reinforced plastic (CFRP) plies, allowing for comprehensive simulation of various failures. The model defines reductions in strength and fracture energy as functions of entropy generation, and incorporates them into the conventional Hashin's criterion for validation.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Multidisciplinary Sciences
Sota Oshima, Ryo Higuchi, Masaya Kato, Shu Minakuchi, Tomohiro Yokozeki, Takahira Aoki
Summary: This study presents the cooling rate-dependent properties of polyphenylene sulfide (PPS) and carbon fiber reinforced PPS (CF/PPS) fabricated under different cooling rates (1, 5, and 10 °C/min). The densities of PPS and CF/PPS were determined based on Archimedes' principle. The coefficients of thermal expansion (CTEs) were measured using a thermomechanical analyzer. Stress-strain curves under different cooling rates were obtained for PPS, and R curves and load-displacement curves were presented for CF/PPS under mode I and mode II loading. The experimental data provide valuable information for the development of numerical models and the evaluation of the properties and quality of carbon fiber reinforced thermoplastic components.
Article
Materials Science, Composites
R. Higuchi, R. Aoki, T. Yokozeki, T. Okabe
ADVANCED COMPOSITE MATERIALS
(2020)
Article
Astronomy & Astrophysics
Ryo Higuchi, Masami Ouchi, Yoshiaki Ono, Takatoshi Shibuya, Jun Toshikawa, Yuichi Harikane, Takashi Kojima, Yi-Kuan Chiang, Eiichi Egami, Nobunari Kashikawa, Roderik Overzier, Akira Konno, Akio K. Inoue, Kenji Hasegawa, Seiji Fujimoto, Tomotsugu Goto, Shogo Ishikawa, Kei Ito, Yutaka Komiyama, Masayuki Tanaka
ASTROPHYSICAL JOURNAL
(2019)
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)
