Article
Chemistry, Physical
Liping Xue, Zhaofeng Chen, Jiahao Liao, Qiqiao Xiao, Yuanhao Li
Summary: The 3D needle-punched carbon fiber preform was densified by PCS infiltration pyrolysis and Al alloy vacuum pressure infiltration to prepare C-f/SiC-Al composites, which exhibited high compressive strength and density, as well as low porosity mainly due to pores filled with Al alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Mechanical
Longbiao Li, Yufeng Liu, Yalei Wang
Summary: In this paper, a hysteresis-based micromechanical method was used to obtain the constituent properties of four different types of 3D needle-punched C/SiC composites. By analyzing the experimental monotonic tensile and cyclic hysteresis curves, the relationship between the composite's constituent properties and mechanical properties were established.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Ceramics
Longbiao Li, Yufeng Liu, Yalei Wang
Summary: This study investigates the effects of ply structure on the mechanical hysteresis behavior of 3D needle-punch C/SiC composites fabricated using CVD and RI methods. Hysteresis-based damage parameters were derived and analyzed, showing the evolution of damage with increasing peak stress. Comparison analysis of the mechanical hysteresis behavior between composites with different ply structures was conducted. The hysteresis-based damage parameters reflect the severity of internal damages in the composites.
CERAMICS INTERNATIONAL
(2023)
Article
Mechanics
Yang Liu, Haitao Zhao, Shun Dong, Xiaoguang Zhao, Yahui Peng, Ji'an Chen
Summary: In this study, a multiscale model combining the finite element method was established to analyze the progressive failure of needle-punched C/SiC composites. Microscopic failure modes under different loads were first analyzed using Micro-RVE, and then coupled with a damage evolution model to calculate the stress-strain relationship and macroscopic failure mode. The strength reduction of the composite under tensile-torsional coupling load was also analyzed. This study effectively revealed the damage evolution process, the relationship between macroscopic load and microscopic failure, and the tensile-torsional coupling failure mechanism of needle-punched C/SiC composites.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Ceramics
Yuanhao Li, Zhaofeng Chen, Lixia Yang, Jiahao Liao, Tianru Guan, Qiqiao Xiao
Summary: The study examined the tensile behavior and failure mechanism of 3D needle-punched Cf/SiC-Al composites, showing that Al alloy successfully prepared between carbon fiber bundles resulted in lower porosity. Cf/SiC-Al composites exhibited higher tensile strength and modulus compared to Cf/SiC composites.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Yufeng Liu, Longbiao Li, Zhongwei Zhang, Xiang Xiong
Summary: This study investigated the monotonic and cyclic loading/unloading tensile behavior of four different 3D needle-punched C/SiC composites, revealing that an increase in fiber volume fraction results in higher initial tangent modulus, tensile strength, and fracture strain, while decreasing unloading residual strain, peak strain, hysteresis width, and hysteresis area in the composite materials.
Article
Materials Science, Ceramics
Haodong Sun, Shangwu Fan, Le Wang, Xu Ma, Juanli Deng, Laifei Cheng, Litong Zhang
Summary: A new preparation method was proposed to improve the wear resistance and stability of C/C?SiC brake materials using SiC ceramics and composite materials, effectively extending their service life.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Guangjun Chen, Jinkai Xu, Jingdong Wang, Ying Li, Jiaqi Wang, Zhanjiang Yu, Huadong Yu
Summary: In the machining of C-f/SiC composites, ultrasonic vibration-assisted milling can improve the machining quality. This study investigated the effect of ultrasonic amplitude on the machining characteristics under different fiber cutting angles, and found that reasonable control of ultrasonic parameters and fiber cutting angles significantly improves the machining quality.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Rong Xue, Zixuan Wang, Zhejian Zhang, Nanlong Zhang, Yonghui Zhang, Hongyan Xia, Zhichao Xiao, Jiping Wang
Summary: Cf/C-SiC composites were fabricated via liquid silicon infiltration and the effect of surface topography and carbon content on their tribological properties was investigated. The results showed that different fiber layers and cross-sections have significant effects on friction and wear properties.
CERAMICS INTERNATIONAL
(2022)
Article
Green & Sustainable Science & Technology
Pablo Monreal-Perez, Daniel Elduque, David Lopez, Iranzu Sola, Javier Yaben, Isabel Claveria
Summary: The main objective of this study is to investigate the effects of incorporating natural sheep wool into railway brake blocks and compare it with commonly used organic fibers. The results show that organic fibers contribute to a more stable braking performance and lower friction in wet conditions. Sheep wool performs better than cellulose in terms of wear rates. However, no conclusive findings can be drawn regarding metal pick-up. Life Cycle Assessment indicates that sheep wool brake blocks have lower environmental impacts compared to the base material or aramid fibers. Overall, sheep wool offers a good balance between cost, wear rates, and environmental impact, making it a viable substitute for cellulose fibers.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Environmental
Eon S. Lee, Keshav Sahay, Edward O'Neil, Subhasis Biswas, Inna Dzhema, Shiou-Mei Huang, Peng Lin, Ming-Chih Oliver Chang, Tao Huai
Summary: Automotive brake-wear emissions, especially from heavy-duty vehicles equipped with drum brakes, are an important contributor to on-road particulate matter (PM) emission inventory. This study developed a novel method and evaluated four heavy-duty vehicles, finding that braking events significantly increase PM concentrations and brake-wear PM also resuspends during acceleration.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Brenda Lopez, Kent Johnson, Heejung Jung
Summary: Decades of regulations have reduced tailpipe PM emissions, but non-tailpipe PM emissions are not regulated and are expected to become a significant source of traffic-related PM emissions. This study aims to establish a test method and analysis for measuring brake activity of heavy-duty vehicles. The results provide critical information for accurately estimating emission inventory.
JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION
(2023)
Article
Mechanics
Guoqiang Wang, Chuwei Zhou, Jian Yu, Yang Ni, Xin Li, Zhongxiao Zhang
Summary: The NP C/C composites are widely used in aerospace sector due to their strong load-bearing capacity in ultra-high temperature environments. The NP preform overcomes the disadvantage of delamination in C/C composites by transferring the fibers from the XY plane to the Z direction through the NP process. However, the stiffness and strength in the layers of C/C composites are reduced by introducing defects. In this paper, a mesoscale mechanical model is proposed to accurately characterize the mechanical behavior of NP C/C composites.
COMPOSITE STRUCTURES
(2023)
Article
Thermodynamics
Jian Yin, Qiang Hao, Yu Liu, Shengfang Zhang, Zhihua Sha
Summary: This paper proposes new internal and surface structures for brake discs through the equivalent moving load (EML) topology optimization method and topography optimization method oriented to displacement and stress control. The mechanical properties of the brake discs are improved, and the effectiveness of the proposed optimization methods is demonstrated.
ADVANCES IN MECHANICAL ENGINEERING
(2022)
Article
Chemistry, Multidisciplinary
Jungmin Lee, Hyung Ik Lee, Jong Gyu Paik
Summary: The study focuses on measuring the 3D thermal conductivities of C/C up to 2000 degrees C using a laser flash method. The research suggests conducting more heat through the mono-axial direction to improve the thermal stability of C/C in harsh environments.