共查询到20条相似文献,搜索用时 15 毫秒
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Automating aerospace composites production with fibre placement 总被引:2,自引:0,他引:2
George Marsh 《Reinforced Plastics》2011,55(3):32
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Design and development of ceramic-based composites with tailored properties for cutting tool inserts
Taha Waqar Syed Sohail Akhtar Abul Fazal M. Arif Abbas Saeed Hakeem 《Ceramics International》2018,44(18):22421-22431
A successful approach to the development of tailored cutting tool materials requires the development of innovative concepts at each step of manufacturing, from the material design, synthesis of composite powders, to their processing and sintering. In this paper, a computational design approach is applied in the development of reinforced ceramic-based cutting tool inserts with tailored structural and thermal properties. Several potential filler materials are considered at the material design stage for the improvement of structural and thermal properties of a selected matrix material. Properties, such as an improved thermal conductivity and reduced coefficient of thermal expansion are essential for an effective cutting tool insert to absorb thermal shock at varying temperatures. In addition, structural properties such as elastic modulus have to be maintained within a moderate range. A mean-field homogenization theory and effective medium approximation using an in-house code are applied for predicting potential optimum structural and thermal properties for the required application. This is done by considering the effect of inclusions as a function of volume fraction and particle size in the ceramic base matrix. Single inclusion composites such as alumina-silicon (Al2O3-SiC) and alumina-cubic boron nitride (Al2O3-cBN) as well as hybrid composite such as alumina-silicon-cubic boron nitride (Al2O3-SiC-cBN) are developed using the Spark Plasma Sintering (SPS) process in line with the designed range of filler size and volume fraction to validate the computational results. It is found that the computational material design approach is precise enough in predicting the target properties of a designed hybrid composite material for cutting tool inserts. 相似文献
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Changtai Zhai Jinkai Xu Xiaoyu Nie Jiwen Tian Huadong Yu 《International Journal of Applied Ceramic Technology》2021,18(6):2273-2283
Based on the response surface methodology (RSM), laser-assisted micromachining (LAMM) experiments of carbon fiber reinforced silicon carbide matrix(C/SiC) composites have been carried out to obtain the data of three-direction cutting forces Fx, Fy, Fz, and result-force F in the cutting process. A stepwise regression method is used to screen out the factors that significantly affected the cutting force, and hence a multivariate nonlinear mathematical regression model has been established. Through the analysis of variance and regression analysis, the R2 of the regression model is the cutting force Fx: 0.975, the cutting force Fy: 0.970, the cutting force Fz: 0.972, the resultant force F: 0.987, and the probability p > F-values are all less than 0.001. The model analysis results show that the main effects and interactions of the three factors of laser power, cutting speed, and cutting depth significantly influence the cutting force. The main effect of the most considerable influence on the resultant F is cutting depth, followed by cutting speed and laser power, and the interactive effect is cutting speed and cutting depth. The experimental results show that the model prediction results are in good agreement with the experimental results. 相似文献
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Glass and Ceramics - 相似文献
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《Ceramics International》2020,46(12):20463-20471
The lifetime of ceramic tool is decreased because of the extension of cracks, and it will be prolonged if the cracks can be self healed. The healing ability of laminated Al2O3 cutting tool composites (Al2O3-(WC-Co)-MgO/Al2O3–TiC–MgO) were assessed. For determining which laminated structure and the healing condition was the best for the composite, the flexural strength and recovery rates were measured and different healing condition were used. XRD, EDS and SEM technology were carried out to identify their compositions and microstructures after the healing. The number of cracks filled with TiO2, crack size and the oxide content effect were utilized to explain why the flexural strength and recovery rates of laminated Al2O3 cutting tool composite after the healing were different. A single particle model was utilized to identify the relation between the threshold time, grain size and the self healing temperature of the composites. 相似文献
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