| 梯度功能陶瓷圆球的抗热震性 |
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| 引用本文： | 赵军,艾兴,李艳征.梯度功能陶瓷圆球的抗热震性[J].硅酸盐学报,2006,34(11):1362-1366. |
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| 作者姓名： | 赵军 艾兴 李艳征 |
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| 作者单位： | 山东大学机械工程学院,济南,250061 |
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| 基金项目： | 国家自然科学基金
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高等学校博士学科点专项科研项目
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高等学校博士学科点专项科研项目 |
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| 摘 要： | 推导和提出了第三类边界条件下梯度功能材料(functionally gradient materials,FGM)圆球的瞬态温度场及瞬态热应力场表达式.基于陶瓷材料的临界应力断裂判据,通过求解梯度功能陶瓷圆球表面达到其局部断裂强度的时间,建立了引起其表面临界热应力的临界温差△Tc的表达式,并以此作为梯度功能陶瓷圆球的抗热震参数.通过计算实例并与均质陶瓷圆球对比,分析了材料的热-物理性能分布规律对其抗热震性的影响,并提出了高抗热震性FGM陶瓷圆球的设计原则:线膨胀系数和热扩散率应由表及里增大,而弹性模量应由表及里减小.
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| 关 键 词： | 梯度功能材料 抗热震性 临界温差 非稳态热应力 |
| 文章编号： | 0454-5648(2006)11-1362-05 |
| 收稿时间： | 06 20 2006 12:00AM |
| 修稿时间： | 08 10 2006 12:00AM |
THERMAL SHOCK RESISTANCE OF FUNCTIONAL LY GRADIENT CERAMIC SPHERES |
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| ZHAO Jun,AI Xing,LI Yanzheng.THERMAL SHOCK RESISTANCE OF FUNCTIONAL LY GRADIENT CERAMIC SPHERES[J].Journal of The Chinese Ceramic Society,2006,34(11):1362-1366. |
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| Authors: | ZHAO Jun AI Xing LI Yanzheng |
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| Affiliation: | School of Mechanical Engineering, Shandong University, Jinan 250061, China |
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| Abstract: | The formulae of the unsteady temperature field and thermal stress field for functionally gradient material (FGM) spheres under convective boundary conditions were derived. Based on the critical stress fracture criterion and by means of the calculation of the time for the surface of FGM ceramic spheres to attain their local fracture strength, the expression of the critical temperature dif-ference ?Tc leading to the critical thermal stress at the surface as the thermal shock resistance parameter for FGM ceramic spheres was obtained. The effects of the thermo-physical properties on the thermal shock resistance of FGM spheres were analyzed via nu-merical calculations in contrast to homogeneous ceramic spheres, from which some design principles for FGM spheres with high thermal shock resistance were proposed. |
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| Keywords: | functionally gradient materials thermal shock resistance critical temperature difference unsteady thermal stresses |
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