Article
Engineering, Mechanical
Maria Pilar Valles Gonzalez, Alejandro Gonzalez Meije, Ana Pastor Muro, Maria Garcia-Martinez, Beatriz Gonzalez Caballero
Summary: The study analyzed multiple fracture cases of fuel control pressure tubes from aircraft engines, finding that the fractures originated from defects in the outer wall of the tube and ultimately resulted in overload fracture.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Manufacturing
Sheng Wang, Mehmet Cagatay Akbolat, Oguzcan Inal, Kali Babu Katnam, Zhenmin Zou, Prasad Potluri, James Taylor
Summary: This study investigates the effect of short micro-fibre-based veils on the fracture energies and R-curves of composite laminates, with a focus on the role of veil binders. The results show that the binders used in the manufacturing of veils have a considerable impact on fracture energy, crack path, and R-curve behavior, with a more pronounced effect in the laminates with carbon veils.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Mechanics
Natalia Ribeiro Marinho, Mariano Andres Arbelo, Geraldo Mauricio Candido, Rita de Cassia Mendonca Sales, Mauricio Vicente Donadon
Summary: This study investigated the Mode I delamination fatigue crack growth behavior in a carbon-epoxy prepreg fabric laminate by evaluating the mean load effects. Results showed that the fatigue crack growth rate was determined as a function of the maximum Mode I strain energy release rate, while the delamination growth rate curve was strongly affected by the applied mean load.
COMPOSITE STRUCTURES
(2021)
Article
Polymer Science
George Irven, Declan Carolan, Alexander Fergusson, John P. Dear
Summary: Epoxy foams with densities ranging from 180 to 500 kg/m3 were mechanically tested and a transition in fracture behavior at a critical density was observed. Lower density foams exhibited lower toughness and fracture energy, while higher density foams showed higher values. Stress-intensity factor increased monotonically with density. The distribution of cell size varied between lower and higher density foams. This study suggests the potential use of higher density foams in composite sandwich structures to achieve increased fracture energy.
Article
Materials Science, Composites
Amit Ramji, Yigeng Xu, Marzio Grasso, Mehdi Yasaee, Philip Webb
Summary: The experimental study found that the delamination resistance of 5-harness satin woven laminates is influenced by both interfacial fiber orientation and veil density, with the 90/45 fiber orientation bias exhibiting the greatest resistance, while increasing veil density has limited additional benefits on resistance enhancement.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
Roberto Ferreira Motta Jr, Rene Alderliesten, Dimitrios Zarouchas, Marcos Yutaka Shiino, Maria Odila Hilario Cioffi, Herman Jacobus Cornelis Voorwald
Summary: This research investigates strain energy release within fatigue load cycle using acoustic emission and formulates the correlation between measured strain energy release and acoustic emission energy. The distribution of strain energy release within the loading cycle indicates activation of different damage mechanisms at different energy thresholds. The presence of multiple energy thresholds suggests distinct resistances to damage propagation depending on the applied loading cycle.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Engineering, Multidisciplinary
Christopher Meninno, Vijaya Chalivendra
Summary: The study investigated the impact of different laminate orientations on mode-I and mode-II fracture toughness, as well as the correlation between fracture toughness values and scanning electron microscopy images. The results showed that C-0-G-90 composites exhibited higher mode-I fracture toughness, while G-0-C-90 composites showed higher mode-II fracture toughness. The electrical response was found to be closely related to crack dynamics.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Mechanics
Renata Latypova, Oskari Seppala, Tun Tun Nyo, Timo Kauppi, Saara Mehtonen, Hannu Hanninen, Jukka Ko Komi, Sakari Pallaspuro
Summary: Suppressing hydrogen embrittlement in martensitic steels is a challenge. This study investigates the effects of prior austenite grain (PAG) shape and size on hydrogen embrittlement resistance in 0.25C steel. Anisotropic elongated PAG structure enhances resistance to hydrogen embrittlement, while larger elongated grains are prone to intergranular fracture. Reaustenitised equiaxed PAGs fail with intergranular cracking, accelerating crack propagation rate compared to quasi-cleavage. PAG boundaries mitigate susceptibility to intergranular cracking.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
S. S. M. Tavares, N. M. Mota, H. R. da Igreja, C. Barbosa, J. M. Pardal
Summary: Nickel aluminum bronzes (NAB) are corrosion resistant alloys commonly used in seawater environments for various components, but there are reported corrosion problems that need to be addressed. This study investigated the mechanical behavior of a cast NAB alloy, revealing the micro-mechanisms of brittle fractures and successfully modeling the true stress-strain curve of the tensile test. These findings are valuable for the application of cast NAB UNS C95800 alloy.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Mechanics
Luis Felipe de Paula Santos, Francisco Maciel Monticeli, Bruno Ribeiro, Michelle Leali Costa, Rene Alderliesten, Edson Cocchieri Botelho
Summary: Carbon nanotube buckypaper (BP) is added into CFR thermoplastic composites as an interlayer to enhance the interlaminar strength. However, the delamination behavior is influenced differently in mode-I and mode-II, with a decrease in interlaminar strength in mode-I and a slight improvement in mode-II.
COMPOSITE STRUCTURES
(2023)
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
Engineering, Multidisciplinary
George Irven, Declan Carolan, Alexander Fergusson, John P. Dear
Summary: Low density aramid and carbon fibre-reinforced epoxy foam was synthesized to improve mechanical properties, especially fracture performance. Fracture energy, compressive strength, and density of the foam were measured. The study investigated the influence of fibre type, loading, and length. The addition of fibres improved mechanical performance, with a significant increase in fracture energy and face-sheet bond propagation fracture toughness.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Mechanics
Abouzar Jafari, Lingyue Ma, Amir Ali Shahmansouri, Roberto Dugnani
Summary: Quantitative fractography is important in analyzing the failure of brittle materials, but its application is limited due to unknown factors. Artificial neural networks (ANNs) were used to analyze the fracture strength of glasses and ceramics. The developed ANN models outperformed empirical relations in predicting fracture strength and could be extended to a broader range of brittle materials.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Manufacturing
K. B. N. V. S. Ganesh Gupta, Satyaroop Patnaik, Rajesh Kumar Prusty, Bankim Chandra Ray
Summary: Simultaneous implementation of IPN formation and nano Al2O3 addition significantly improved the mechanical performance of GFRP composites. The nano Al2O3 modified composites showed improvements in flexural strength, tensile strength, ILSS, G(IC), and G(IIC) of approximately 18%, 8%, 14%, 19%, and 29% respectively, compared to composites without nano Al2O3. The composite with 0.1 wt% nano Al2O3 exhibited the highest mechanical properties in all testing modes except for mode-II ILFT testing, where the composite with 0.4 wt% nano Al2O3 showed the highest G(IIC) value. The synergy between constituents and the thermal stability of the composites were analyzed using Fourier transform infrared spectroscopy and differential scanning calorimetry respectively. Fractography was performed to understand the failure criteria and toughening mechanisms of the composites.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Ali Narjabadifam, Babak Abazadeh, Mir Masoud Seyyed Fakhrabadi
Summary: This paper investigates the mechanical behavior of nano-spirals made of different graphyne structures under tension using molecular dynamics simulation, comparing the results with graphene nano-spirals. Five distinct deformation stages are observed, with the effects of various base structures on superelastic deformation capabilities and fracture mechanisms analyzed. It is found that the stretchability of nano-spirals increases with outer radius up to a maximum threshold, then decreases, with graphene and gamma-graphyne spirals showing clearer decrease compared to alpha- and beta-graphyne spirals.
MECHANICS OF MATERIALS
(2022)
Article
Engineering, Manufacturing
Wenwu Zhang, Helezi Zhou, Bin Huang, Huamin Zhou, Xiongqi Peng
Summary: This paper investigates the tool-ply friction behavior of jute/PLA biocomposites in thermoforming. A pull-through friction testing device was developed to characterize the tool-ply friction behavior of jute/PLA prepreg at elevated temperature. The effects of alkali treatment, fiber orientation, normal force, and slipping velocity were studied, and a quantitative definition of tool-ply friction behavior was achieved. The results indicate a strong relationship between tool-ply friction behavior and woven and fiber structures, indicating hydrodynamic lubrication.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2024)
Article
Engineering, Manufacturing
Stephen Clay, Wesley Ault, Alex Faupel, Caglar Oskay, Philip Knoth, Noam N. Y. Shemesh, Rami Haj-Ali, Uri Breiman, Ido Meshi, Ofir Shor
Summary: This paper presents an experimental investigation on the compression failure mechanisms of laminated carbon fiber reinforced composites under non-standard quasi-static loading. The results demonstrate the presence of interior kink bands, surface ply splitting, and delaminations, with each failure mechanism associated with different stress levels.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2024)
Article
Engineering, Manufacturing
Bowen Zeng, Jinlong Yang, Zhi Ni, Yucheng Fan, Ziyan Hang, Chuang Feng
Summary: This study successfully improved the pyroelectric properties of PVDF films by preparing functionally graded graphene nanoplatelet (FG-GNP) reinforced PVDF composite films. The increase in the number of layers and the concentration of GNP near the surface of the composite film were found to enhance the pyroelectric properties and temperature stability.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2024)
Article
Engineering, Manufacturing
Shenghe Zhang, Fukai Chu, Weizhao Hu, Bibo Wang, Richard K. K. Yuen, Yuan Hu
Summary: This study improves the flame retardancy and mechanical properties of PBAT by synthesizing a phosphorus-containing intercalator and mixing it into the PBAT matrix.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2024)
Article
Engineering, Manufacturing
Tharan Gordon, Michael R. Wisnom, Byung Chul Kim
Summary: Thickness tapering is a common strategy for efficient and lightweight composite structures, but it can introduce delamination sites. This study investigated the use of ply scarfing method to improve the compressive failure stress of tapered laminates made from thick unidirectional non-crimp fabrics. The results showed that ply scarfing suppressed delamination and increased the failure stress by 60%.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2024)
Article
Engineering, Manufacturing
Xin Wang, Yiting Qu, Junlei Bai, Fujun Xu, Bin Ding, Xiaohua Zhang
Summary: A solution-based strategy is proposed to achieve a strong bond between fibers and matrix in powder materials, resulting in improved mechanical properties, thermal conductivity, and fracture strain of the composites. The method also offers advantages such as enhanced powder flowability and thermal stability.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2024)
Article
Engineering, Manufacturing
Xing Zhou, Guosheng Wang, Dexiang Li, Qi Wang, Keming Zhu, Yaya Hao, Yueyang Xu, Neng Li
Summary: This study successfully synthesized polyurethane elastomer by using degraded products from waste PET, and fabricated composites with carbon nanotubes for strain sensors. The composites showed good mechanical and durability performance, indicating a potential method for recycling waste PET into valuable and functional materials.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2024)
Article
Engineering, Manufacturing
Fei Peng, Tingting Shan, Rongrui Chen, Jiulong Shi, Di Liu, Guoqiang Zheng, Chaojun Gao, Kun Dai, Chuntai Liu, Changyu Shen
Summary: Janus polymer films with distinct surface performance and potential applications were successfully prepared by vacuum-assisted hot-compressing method and spray coating. These films exhibit decent actuation performance and rapid selfpowered sensing property, and can be used for real-time acetone monitoring system.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2024)
Article
Engineering, Manufacturing
Biao Cheng, Huafeng Quan, Yuefeng Zhang, Dong Huang, Tongqi Li, Chong Ye, Xingming Zhou, Zhen Fan, Yafang Zhang, Ting Ouyang, Fei Han, Hongbo Liu, Jinshui Liu
Summary: In this study, a binary graphite network was constructed to improve the thermal conductivity and control the formation of micrometer-scale open pores in phase change composites. The developed composites showed a high thermal conductivity and phase change enthalpy, making them promising for thermal control in space optical-mechanical systems and other critical aerospace components.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2024)
Article
Engineering, Manufacturing
Shihao Zuo, Fei Cheng, Guangming Yang, Jiangzhou Li, Yongjun Deng, Guangjun Gou, Xuejun Cui, Yunsen Hu, Xiaozhi Hu
Summary: Micro-arc oxidation (MAO) treatment was used to modify aluminum (Al) alloys in order to improve bond strength with carbon fiber reinforced polymer (CFRP). The treatment successfully created a porous surface with better hardness, roughness, and wetting, and introduced resin pre-coating (RPC) and carbon nanotube (CNT) fiber bridging to improve the bonding interface. The combined treatments significantly increased the bond strength by up to 156.1%, indicating the feasibility of MAO as an alternative method for manufacturing high-performance Al-CFRP composites in industrial production.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2024)
Article
Engineering, Manufacturing
James Kratz, Christophe Paris, Karolina Gaska, Vincent Maes, Ivana Partridge, Philippe Olivier
Summary: Faster heating rates and higher process temperatures can reduce the total process time while achieving the same degree-of-cure. Thermal analysis shows that thermoplastic interleaf particles melt at the recommended curing temperature. A short dwell at a lower temperature can prevent the mixing of thermoplastic particles and thermoset pre-polymer.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2024)
Article
Engineering, Manufacturing
Thomas Maierhofer, Evripides G. Loukaides, Craig Carr, Chiara Bisagni, Richard Butler
Summary: Joining thermoset composites via resistance welding provides an efficient method for aerospace structures with benefits such as high-volume manufacturing and simplified surface preparation. The influence of welding parameters on joint performance is assessed using Mode I fracture toughness testing. A Bayesian approach is employed to select high-performance parameters.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2024)
Article
Engineering, Manufacturing
Jiangan You, Ling Cai, Ronghua Yu, Haiping Xing, Jian Xue, Ying Li, Zhiwei Jiang, Dongmei Cui, Tao Tang
Summary: In response to the global environmental pollution crisis caused by waste plastics, recyclable design is an effective solution. A CPVC/PUA nanocomposite foam was developed using the plasticizing-foaming-reinforcing strategy, combined with catalytic carbonization. The foam exhibited high expansion ratio, robustness, solvent resistance, flame-triggered shape memory effect, and ablation resistance. The foam could be directly upcycled into functional carbon foam with attractive electromagnetic interference shielding performance.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2024)
Article
Engineering, Manufacturing
Siyao Chen, Zhiyu Chen, Yangling Ou, Junwei Lyu, Junning Li, Xiangyang Liu, Yang Liu
Summary: In this study, we demonstrated the significant effect of composite interface on temperature increase in electrical heaters. By selectively fluorinating the outer walls of carbon nanotubes and compositing them with cellulose nanofibers, improved interfacial phonon diffusion was achieved, leading to a higher temperature increase rate.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2024)
Article
Engineering, Manufacturing
Yanjun He, Agnieszka Suliga, Alex Brinkmeyer, Mark Schenk, Ian Hamerton
Summary: A new thermoset resin system based on a polybenzoxazine blend showed good performance under high ATOX irradiation. It reduced erosion yield by forming a silicon-rich surface layer and improved the mechanical properties of CFRP laminates.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2024)