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Load distribution in threads of porous metal-ceramic functionally graded composite joints subjected to thermomechanical loading

机译:承受热机械载荷的多孔金属陶瓷功能梯度复合材料接头在螺纹中的载荷分布

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摘要

Metal-ceramic functionally graded materials (FGMs) have been extensively used in aerospace engineering where high strength and excellent heat insulation materials are desired. In this paper, load distribution in threads of the Thermal Protection System used bolted joint made up of porous ZrO2/(ZrO2 + Ni) FGMs is investigated by ABAQUS codes. The bolted joint is subjected to reentry heating corresponding to the Access to Space Vehicle. Effects of bolt-nut parameters including thread tooth profile, thread pitch, and modulus ratio of bolt to nut on load distribution in threads are analyzed in detail. It is found that uneven load distribution in threads occurs at elevated temperature, which mainly focuses on the first two threads closest to the nut bearing surface, with the first thread carrying 74% of the total load. Bolt-nut parameters have great effects on load distribution in threads, with trapezoidal thread, extra fine thread and greater modulus ratio of bolt to nut leading to more evenly distributed load. Further studies show that nut shape has significant effects on load distribution in threads, the optimized nut is designed to make the maximum load bearing ratio of the thread decrease to 30.21%, and thus the service reliability of the bolted joint is greatly improved. (C) 2015 Elsevier Ltd. All rights reserved.
机译:金属陶瓷功能梯度材料(FGM)已广泛用于需要高强度和出色隔热材料的航空航天工程中。本文通过ABAQUS代码研究了由多孔ZrO2 /(ZrO2 + Ni)FGM组成的螺栓连接的热保护系统的螺纹中的载荷分布。螺栓连接受到与进入太空飞行器对应的再进入加热。详细分析了螺栓螺母参数,包括螺纹齿廓,螺距和螺栓螺母的模数比,对螺纹载荷分布的影响。发现在高温下,螺纹中的载荷分布不均匀,这主要集中在最靠近螺母轴承表面的前两个螺纹上,而第一个螺纹承担了总载荷的74%。螺栓螺母参数对螺纹中的载荷分布有很大的影响,梯形螺纹,超细螺纹以及螺栓与螺母的模数比更大,导致载荷分布更均匀。进一步的研究表明,螺母的形状对螺纹的载荷分布有很大的影响,优化的螺母被设计为使螺纹的最大承载率降低到30.21%,从而大大提高了螺栓连接的使用寿命。 (C)2015 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Composite Structures》 |2015年第12期|680-688|共9页
  • 作者单位

    Peking Univ, Coll Engn, State Key Lab Turbulence & Complex Syst, Beijing 100871, Peoples R China;

    Beijing Jiaotong Univ, Dept Mech, Beijing 100044, Peoples R China;

    Beijing Jiaotong Univ, Dept Mech, Beijing 100044, Peoples R China;

    Peking Univ, Coll Engn, State Key Lab Turbulence & Complex Syst, Beijing 100871, Peoples R China;

    Peking Univ, Coll Engn, State Key Lab Turbulence & Complex Syst, Beijing 100871, Peoples R China;

    Peking Univ, Coll Engn, State Key Lab Turbulence & Complex Syst, Beijing 100871, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Functionally graded composite joints; Thermomechanical; Finite element modeling; Load distribution;

    机译:功能梯度复合材料接头;热机械;有限元建模;载荷分布;

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