| 热膨胀系数异性轴夹角优化分析 |
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| 引用本文： | 耿湘人,桂业伟,唐伟,贺立新,刘磊. 热膨胀系数异性轴夹角优化分析[J]. 工程热物理学报, 2008, 29(12) |
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| 作者姓名： | 耿湘人 桂业伟 唐伟 贺立新 刘磊 |
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| 作者单位： | 中国空气动力研究与发展中心,四川,绵阳,621000 |
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| 摘 要： | 高超声速飞行器需要先进的材料进行热防护,比如增强碳/碳材料.有两种将碳纤维制作成碳/碳球锥外形的工艺,研究表明在每种工艺中,碳/碳块体或碳纤维热膨胀系数异性轴角度对结构热应力影响很大,为此本文发展了一套优化设计方法,对给定的对流加热温度场可以实现球锥热应力的最小化.分析结果表明对于热膨胀系数异性轴角度,存在某些取值点,那时结构热应力分别达到最大和最小值.在异性轴模晕小于同性平面模量的条件下,对于工艺1,如果将球锥对称轴设置成垂直于碳/碳块体的同性平面,可以将热应力减至最小;对于工艺2,如果能将编制面内的碳纤维束异性轴角度取成负值(即指向来流方向),则球锥热应力也可以得到相当程度的减小.
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| 关 键 词： | 热膨胀系数 热应力 优化设计 C/C复合材料 |
OPTIMIZATION ON ANISOTROPIC AXIS ANGLE OF THERMAL EXPANSION COEFFICIENT OF NOSE CONE |
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| GENG Xiang-Ren,GUI Ye-Wei,TANG Wei,HE Li-Xin,LIU Lei. OPTIMIZATION ON ANISOTROPIC AXIS ANGLE OF THERMAL EXPANSION COEFFICIENT OF NOSE CONE[J]. Journal of Engineering Thermophysics, 2008, 29(12) |
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| Authors: | GENG Xiang-Ren GUI Ye-Wei TANG Wei HE Li-Xin LIU Lei |
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| Affiliation: | GENG Xiang-Ren GUI Ye-Wei TANG Wei HE Li-Xin LIU Lei (China Aerodynamics Research , Development Center,Mianyang 621000,China) |
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| Abstract: | Advanced heat-shield materials,such as reinforced carbon/carbon,are needed to protect the hypersonic vehicles from being damaged by convective heating.Generally there are two techniques to weave and fabricate the C/C fibers into a nose cone.It has been found that the anisotropic axis angle of thermal expansion coefficient of C/C block or fibers can influence the thermal stress greatly. Therefore,an optimization method has been developed to minimize the thermal stress of nose cone based upon the temperature ... |
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| Keywords: | coefficient of thermal expansion thermal stress optimization C/C composites |
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