Article
Materials Science, Ceramics
Haopeng Cai, Yinglong Wei, Baoguo Wang, Kun Jiang
Summary: In this study, SiC/Al2O3/TiB2 ceramic composites were prepared by spark plasma discharge sintering, and cracks were introduced on the surface of the polished specimens. It was found that the surface cracks of the material were completely filled and healed by oxidation products after heat treatment at 700 degrees C for 60 min, and the highest healing efficiency exceeded 95% for both specimens with different crack lengths. The main mechanism of crack healing was the reaction of TiB2 and a small amount of SiC with oxygen to produce oxides and glass powder.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Engineering, Marine
Qin Dong, Geng Xu, Yaoyu Hu, Ziya Peng
Summary: The main objective of this paper is to investigate the residual strength of a cracked plate considering fatigue crack propagation under cyclic loading. Factors such as crack length, number of cycles, tensile/compressive cyclic loads, and out-of-plane deformation are considered in the study of residual strength. The numerical results provide insight into the effect of crack propagation on structural residual strength, aiming to guide the evaluation of residual strength in cracked components.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Materials Science, Ceramics
Yang Liu, Hanlian Liu, Chuanzhen Huang, Lianggang Ji, Limei Wang, Yulan Yuan, Qian Liu, Quanquan Han
Summary: A new alumina-based ceramic material with excellent crack healing ability was successfully fabricated by incorporating SiC whiskers and TiSi2 particles. The healing behavior of different sizes of cracks was studied under high temperature oxidation experiments, and the influences of healing temperature, healing time, and crack size on the material's surface morphology and flexural strength were investigated. The crack healing primarily relied on the high temperature oxidation reactions of Ti5Si3 and SiC whiskers, and a new crack healing mechanism involving local crack bridging and liquid phase filling was revealed. This research finding has significant implications for repairing and remanufacturing ceramic materials with crack defects.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Xinyao Cui, Chuanzhen Huang, Zhenyu Shi, Hanlian Liu, Shijie Li, Youlong Han, Lianggang Ji, Zhen Wang, Longhua Xu, Shuiquan Huang
Summary: By studying the air and vacuum heat treatments, it was found that Ti(C,N)-TiSi2-WC composite ceramic tools have crack-healing ability under certain conditions, which can significantly improve the tool life of ceramic tools.
CERAMICS INTERNATIONAL
(2023)
Article
Dentistry, Oral Surgery & Medicine
Ke Ning, Fang Yang, Ewald Bronkhorst, Jan Ruben, Liebert Nogueira, Havard Haugen, Bas Loomans, Sander Leeuwenburgh
Summary: This study investigated the fatigue behavior and aging process of self-healing composites containing microcapsules. The results showed that the self-healing composites exhibited improved fatigue resistance compared to the composites without microcapsules.
Article
Chemistry, Physical
De Lu, Min Niu, Lei Zhuang, Lei Su, Pengfei Guo, Hongfei Gao, Liang Xu, Zhixin Cai, Mingzhu Li, Kang Peng, Hongjie Wang
Summary: We report a SiC@ PyC nanofiber aerogel with superelasticity and mechanical strength, which can stably sense pressure and absorb organic solvents, showing promising applications.
Article
Chemistry, Physical
Baoguo Wang, Rong Tu, Yinglong Wei, Haopeng Cai
Summary: In this study, a self-healing ceramic composite was prepared using spark plasma sintering at lower temperatures, and it was found that cracks could be completely healed in air above 700 degrees C.
Article
Nanoscience & Nanotechnology
Yubo Gao, Yanxin Ge, Peng Xu, Wei Zhang, Xuanming Cai, Jianjun Zhang
Summary: The study found that the dynamic strength of the Al2O3/SiC composite is sensitive to strain rate and is controlled by its microstructure. The microfracture mechanism of the composite varies with the location and stress state of the specimen.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Ceramics
Zicheng Meng, Tae Woo Kim, Sung Min Lee, Kee Sung Lee
Summary: In this study, crack healing behavior of SiC-SiC ceramic matrix composite (CMC) samples prepared by different methods was investigated. It was found that cracks in CVI-prepared samples healed at 1500 degrees C, while those in LMI-prepared samples healed at a lower temperature of 1400 degrees C. The four-point bending test confirmed the healing in LMI-prepared samples at room temperature and 1200 degrees C.
JOURNAL OF THE KOREAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Le Wang, Shangwu Fan, Shaobo Yang, Biao Ji, Chenghua Luan, Bohan Zheng, Juanli Deng, Laifei Cheng
Summary: The study investigated the joining performance of CYAS glass powder sintered under different temperature conditions with SiCf/SiC composites. The joint prepared under 1400 degrees C/30 min condition was the densest, defect-free, with the highest shear strength.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Huanxiang Lv, Qi Zhou, Yunfeng Su, Shuna Chen, Hengzhong Fan, Junjie Song, Yongsheng Zhang, Litian Hu
Summary: A series of Al2O3 composite ceramics were developed with short Al2O3 fibers and a compound interface phase, which improved the damage tolerance and overcame the brittleness of ceramic materials.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Renato S. M. Almeida, Si'an Chen, Benjamin Besser, Kamen Tushtev, Yang Li, Kurosch Rezwan
Summary: In this study, the fatigue behavior of a C/SiC composite produced by polymer infiltration and pyrolysis was investigated. The results showed that most of the damage occurred in the first cycle, but the samples survived 1,000,000 cycles and exhibited an increase in tensile strength.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Engineering, Mechanical
Jiacheng Qi, Caiyan Deng, Yong Liu, Baoming Gong, Dongpo Wang
Summary: In this study, the Chapetti cyclic resistance curve is modified using an R-dependence model based on the cyclic strain energy density to account for the effects of mean stress on crack propagation threshold and fatigue limit. As a result, a crack growth model for the modified NASGRO with mechanically short crack extension and Kitagawa-Takahashi diagram are derived with mean stress sensitivity. The modified approach shows good accuracy in predicting near-threshold crack propagation behavior and S-N curves for engineering aluminum alloys and titanium alloys in the high cycle regime.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Geng Hou, De-Guang Shang, Lin-Xuan Zuo, Lin-Feng Qu, Ming Xia, Yi-Er Guo, Xiang Yin, Shao-Dong Wu
Summary: The fatigue test of a needled C/SiC composite with a notch under tension-tension cyclic loading was completed, and the main fatigue crack propagation curve of the needled composite was obtained through in situ observation. By analyzing the influence of failure number and distribution on the tensile loading of 0 degrees fiber bundles, the relationship between main fatigue crack propagation and the distribution of 0 degrees fiber bundles in the needled composite was established. The reasons for the varying fatigue resistance of different notched specimens were also explained by observing the fracture microstructure, especially the distribution of 0 degrees fiber bundles, through scanning electron microscopy. In addition, acoustic emission (AE) was used to analyze the AE energy characteristics during the fatigue crack propagation process of the needled composite.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Ales Buyakov, Vasiliy Shmakov, Svetlana Buyakova
Summary: This study examines the impact of structural architecture on the fracture toughness and self-healing ability of ZrB2-SiC-TaB2 composites. It is found that the dual composite architecture enhances the fracture toughness through crack arrest and elastic microstress fields. Additionally, the SiC component enables the composites to self-heal surface defects at high temperatures, thereby preventing crack initiation. The analysis of residual strength after self-healing helps determine the optimal matrix-inclusion ratio for minimizing reliability loss.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Ryutaro Fueki, Koji Takahashi, Mitsuru Handa
Article
Engineering, Mechanical
Koji Takahashi, Yuta Kogishi, Norihito Shibuya, Fumiaki Kumeno
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2020)
Article
Materials Science, Multidisciplinary
Yoshitomi Yamada, Eto Hirohito, Koji Takahashi
Article
Optics
Ryutaro Fueki, Koji Takahashi
Summary: The research found that laser peening significantly improves the fatigue strength and reliability of high strength steel welded joints. Even defects of limited depth can be rendered harmless through LP treatment. The key factor contributing to the improvement in fatigue limit is the introduction of compressive residual stress by LP.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Engineering, Mechanical
Ki-Woo Nam, Kotoji Ando, Min-Heon Kim, Koji Takahashi
Summary: Research has determined key characteristics for high-strength steel equipment designed against fatigue limit using surface crack nondamaging technology, including the aspect ratio of surface cracks, the relationship between maximum harmless crack depth and maximum allowable crack depth, as well as the importance of nondestructive inspection in detecting crack depth.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Takehiro Ishii, Koji Takahashi
Summary: Surface defects have a negative impact on the fatigue limit of metals, as demonstrated in a study on high-strength spring steel specimens; Experimental results show that the fatigue limit decreases with an increase in slit depth; Predictions based on the modified El-Haddad model are in good agreement with the experimental data, proving the model's reliability in evaluating fatigue limits of high-strength steels containing small surface defects with different stress ratios.
Article
Engineering, Mechanical
Min-Heon Kim, Won-Gu Lee, Cheol-Su Kim, Koji Takahashi, Mitsuru Handa, Ki-Woo Nam
Summary: The study found that after needle peening on DNV F690 offshore structural steel, compressive residual stress can increase fatigue limit, especially effective for specimens with smaller crack sizes.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Physical
Kazuya Saigusa, Joji Yamamoto, Koji Takahashi, Fumiaki Kumeno, Norihito Shibuya
Summary: This study aimed to improve the bending strength and reliability of ceramics using laser peening. LP without coating (LPwC) and with coating (LPC) were applied to silicon nitride (Si3N4) under various conditions. The results showed that the LPwC specimen had a greater surface roughness but introduced larger and deeper compressive residual stress, resulting in higher bending strength and less scatter compared with the non-LP and LPC specimens.
Article
Materials Science, Multidisciplinary
Shiori Tsuchiya, Koji Takahashi
Summary: This study investigates the effect of laser peening on the fatigue strength of additive-manufactured metals, and finds that laser peening can improve fatigue limit and render surface defects harmless.
Article
Materials Science, Multidisciplinary
Misato Nakamura, Koji Takahashi, Yuta Saito
Summary: The effects of shot peening and laser peening on the fatigue strength of additively manufactured aluminum alloy specimens were investigated. The results showed that both treatments significantly improved the fatigue strength and altered the surface roughness and waviness of the specimens. Fatigue cracks originated from defects and concave areas on the surface. Furthermore, the introduction of deep compressive residual stress by laser peening further increased the fatigue strength of the specimens.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Toshiya Tsuji, Masashi Fujino, Koji Takahashi
Summary: This study investigates the effects of shot peening as a means of remanufacturing gears. Shot peening was used to render artificial defects harmless and increase the fatigue strength of carburized steel specimens. The results show that shot peening can effectively repair defects and improve the performance of gears as a remanufacturing method.
Article
Engineering, Mechanical
Yasuhiro Ashiba, Yuu Koizumi, Koji Takahashi, Akihiko Hirano, Tsuneo Takayamagi, Yoshizumi Fukuhara, Fuminori Iwamatsu
MECHANICAL ENGINEERING JOURNAL
(2020)
Proceedings Paper
Engineering, Mechanical
Y. Yamada, H. Eto, J. Konya, K. Takahashi
2018 INTERNATIONAL CONFERENCE ON MATERIAL STRENGTH AND APPLIED MECHANICS (MSAM 2018)
(2018)
Proceedings Paper
Engineering, Mechanical
K. Takahashi, T. Oki
2018 INTERNATIONAL CONFERENCE ON MATERIAL STRENGTH AND APPLIED MECHANICS (MSAM 2018)
(2018)
Article
Engineering, Multidisciplinary
Ryutaro Fueki, Koji Takahashi
INTERNATIONAL JOURNAL OF STRUCTURAL INTEGRITY
(2018)
