Article
Materials Science, Ceramics
Chihiro Ito, Toshio Osada, Shingo Ozaki
Summary: In this study, the finite element method was used to predict the nonlinear relationship between defect size and fracture strength in ceramics. By considering the competition between surface and internal defects within the linear elastic fracture mechanics framework, the evaluation of strength scatter and allowable crack size was demonstrated.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Gyeongran Shim, Soo-Hyun Kim, Seyoung Kim, In-Sub Han, Hyung-Joon Bang, Young-Hoon Seong, Seulhee Lee, Wan Sik Kim, Kwangbok Shin
Summary: SiCf/SiC composites fabricated through a two-step pyrolysis process and LSI process exhibit increased density, reduced porosity, and higher flexural strength compared to those fabricated through a one-step pyrolysis process. Among specimens processed with the same two-step pyrolysis, those subjected to LSI at 1500 degrees Celsius show significantly higher flexural strength than those at 1450 or 1550 degrees. Additionally, mechanical properties of SiCf/SiC specimens processed at 1500 degrees Celsius are superior to those at 1550 degrees Celsius despite similar porosity and density due to the rapid degradation of Tyranno-S grade SiC fibers at higher LSI process temperatures.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Composites
Hongyan Li, Le Lu, Hongli Liu, Wenjin Yuan, Bo Zhang, Jing Li, Yajing Li, Yongqiang Fu
Summary: This paper investigates the control and influence of electrostatic interaction phase interface in aerogel/polymer composites. It is found that the properties of the composites can be affected by adjusting the characteristics of polymer side chains and charged monomers. The results provide insights into optimizing the thermal stability and thermal conductivity of these composites through molecular chain arrangements and charge distribution.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
Yahui Zhang, Puhui Chen
Summary: An improved methodology of constructing inter-fiber failure criteria based on Mohr's theory and physical mechanisms is proposed in this study. The expression of the failure criteria is a quadratic polynomial, which shows good prediction accuracy compared to theoretical predictions and experimental data.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Materials Science, Ceramics
Igor Pinheiro de Brito, Ester Pires de Almeida, Gelmires de Araujo Neves, Helio de Lucena Lira, Romualdo Rodrigues Menezes, Valmir Jose da Silva, Lisiane Navarro de Lima Santana
Summary: Ceramic composites containing cordierite and mullite were produced for potential use as refractory materials, with formulations characterized for their physical, chemical, and mineralogical properties. Results showed that formulations with higher content of fine kaolin residue have potential for manufacturing refractory materials such as furnace rollers and supports.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
Yutong Fu, Xuefeng Yao, Xuhao Gao
Summary: This paper investigates the void generation in 3D braided composites during RTM process and optimizes its manufacturing technology. By deriving governing equations and simulating the RTM process using FEM, the study analyzes the effects of resin parameters on void distributions and contents in 3D braided composite cells. The results provide a theoretical basis for analyzing void generation and evaluating the quality of 3D braided composites made by RTM technology.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Review
Engineering, Manufacturing
Xiaohong Zhang, Chengying Bai, Yingjie Qiao, Xiaodong Wang, Dechang Jia, Hongqiang Li, Paolo Colombo
Summary: Porous geopolymers have gained attention for their low cost, ease of fabrication, suitable properties, and thermal and chemical stability. Research efforts have been focused on exploring composite materials to enhance their properties and functionalities. This review aims to advance innovative fabrication methods and promote the technological application of porous geopolymer components.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Mechanics
Tianlei Yao, Diansen Li, Lei Jiang
Summary: This paper developed a parametric model for fine weave pierced carbon/carbon composites and studied the mechanical properties of composites with different yarn contents. The results showed that increasing the amount of Z-directional yarns significantly improved the modulus and compressive strength of the composites, while the X/Y-directional performance slightly decreased. The accuracy of the model prediction using Hashin failure criterion was better than that of the Hoffmann criterion. The composite failure mainly occurred in the compressive failure regions of the yarns or fibers.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Xun Wu, Michael R. Wisnom
Summary: One of the major difficulties in determining the compressive strengths of composites is the stress concentration and strain gradient effect. In this study, unconventional flexural tests were conducted on carbon fibre/wood sandwich and monolithic composite beams to obtain reliable compressive failure strains. The results showed high values and low variability, with the compressive strain of IM7/8552 material being 1.36% higher than previously published values and only 3% variability. Additionally, the strain gradient effect on compressive failure strain was analyzed for the first time using different wood core depths, with the effect decreasing with increased beam thickness.
COMPOSITE STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
B. Daum, R. Rolfes
Summary: The paper applies micropolar continuum theory to predict the microbuckling strength of long fiber reinforced composites and extend simulations into the collapse regime. Compared to fine scale micromechanical representation, this approach offers superior numerical efficiency. Micropolar homogenization introduces additional rotational degrees of freedom to address the issue of fiber curvature not being considered.
MECHANICS OF MATERIALS
(2022)
Article
Mechanics
Weizhu Zhou, Weidong Zhu, Qiang Xu, Yinglin Ke
Summary: This study investigates the effect of voids on the damage mechanism of composite materials under out-of-plane tensile load with different lay-up temperature conditions. By establishing micro and macro models, experimental and numerical analyses show that increasing lay-up temperature leads to changes in the types and distribution of voids, resulting in a decrease in the out-of-plane tensile strength of the composite.
COMPOSITE STRUCTURES
(2021)
Article
Nanoscience & Nanotechnology
Sijia Huo, Yujin Wang, Qianqian Chen, Mianyi Yao, Lei Chen, Hui Gu, Limeng Liu, Jiahu Ouyang, Yu Zhou
Summary: (Ti,Ta)(B,C)-(Ta,Ti)C composites were synthesized using commercial TaB2 and TiC powders, resulting in improved microstructure due to reaction and solid solution coupling effect. The mechanical properties of the composites were enhanced with increasing TiC content, showing higher Vickers hardness, flexural strength, and fracture toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Multidisciplinary
Marina Fradin, Guillaume Couegnat, Francis Rebillat, Kevin Haras, Gerard L. Vignoles
Summary: This paper presents a 1D analytical model to describe the oxidation behavior of carbon/carbon composites used in rocket propulsion. The model is validated through comparison with experimental results. Oxidation experiments are conducted using different matrix fractions of the composites, and the morphologies are characterized using X-ray micro-computerized tomography and a 3D-image correlation technique. Guidelines for designing and optimizing porous C/C composites with respect to oxidation resistance are provided.
COMPOSITES PART B-ENGINEERING
(2023)
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, Manufacturing
Bright Asante, Hanzhou Ye, Martin Nopens, Goran Schmidt, Andreas Krause
Summary: Geopolymer wood composites (GWC) serve as a green alternative to Portland cement wood composites in construction, and the wood's initial moisture content affects the material properties of GWC. The study found that using wood with higher moisture content resulted in more structurally bound water in the GWC, while using dry wood led to higher density, compressive strength, and lower porosity in the composites.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2022)
Article
Chemistry, Physical
Yuanping He, Yu-Xiao Cui, Fang-Hong Sun
SURFACE REVIEW AND LETTERS
(2019)
Article
Chemistry, Physical
Yu-Xiao Cui, Yuanping He, Chunhui Ji, Bin Lin, Dawei Zhang
SURFACE REVIEW AND LETTERS
(2020)
Article
Materials Science, Ceramics
Feifei Zhao, Bin Lin, Yuanping He, Tianyi Sui
Summary: The study focused on the material removal mechanism of high-speed cross scratches on quartz glass, showing that the intersection area is more damaged and enters brittle removal earlier. The cutting forces at different points of intersection result in varied fracture morphology. The reflection fracture of stress waves caused by impact load is the crucial factor leading to the cross-point effect of the intersection area.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Aerospace
Feifei Zhao, Bin Lin, Yuanping He, Tianyi Sui
Summary: Precision and low damage grinding is important for improving the efficiency of aviation optical elements. The interaction of abrasive trajectory affects the surface and subsurface morphology and damage. The study explores the interference mechanism and damage accumulation of cross scratches, and finds that the crossing angle, damage radius, and duration of cutting force affect the depth and length of damage.
CHINESE JOURNAL OF AERONAUTICS
(2022)
Article
Engineering, Industrial
Feifei Zhao, Bin Lin, Yuanping He, Tianyi Sui, Helin Li, Pengcheng Zhao
Summary: The study investigated the influence of particle trajectory curvature change on material grinding mechanism through a theoretical model and experiments, finding that an increase in trochoid curvature leads to more significant material damage inside scratches than outside. Numerical simulation and theoretical analysis verified the relationship between damage difference and curvature on both sides of trochoid feed scratches, providing theoretical guidance for efficient and controllable precision grinding of quartz glass.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Engineering, Biomedical
Xiao-Fei Song, Hua-Run Ma, Yuan-Ping He, Ling Yin
Summary: This paper investigates the surface and edge chipping damage induced by diamond machining in two pre-crystallized LS materials. The study finds that Pre-ZLS produces larger surface roughness and deeper edge damage compared to Pre-LS, and has lower machining forces. Increasing material removal rates lead to significantly increased machining forces, surface roughness and damage. Therefore, optimization of soft machining processes is necessary for achieving acceptable surface and edge quality.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2022)
Article
Materials Science, Composites
Yuanping He, Bin Lin, Yaohua Wang, Feifei Zhao, Guochen Ning, Xuan Bao, Tianyi Sui
Summary: This study proposes a method of improving the tribological properties of hexagonal boron nitride/short carbon fibers/polytetrafluoroethylene (h-BN/SCFs/PTFE) composites by adding homologous micropowder (MP1100) with polar groups. Composites of h-BN/SCFs/PTFE with different weight percentages of MP1100 were prepared and evaluated using a pin-on-disc device. The experimental results show that MP1100 micropowder enhances the mechanical properties, friction coefficient, and wear resistance of the composites. A significant decrease in wear rate, up to 78.4%, was observed for composites containing 24 wt% MP1100, which can be attributed to changes in the composite molecular structure, the formation of a transfer film from debris absorption, and the formation of chemically reacted polar group compounds on the steel disc.
POLYMER COMPOSITES
(2023)
