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C/SiC复合材料螺栓螺牙承载能力
引用本文:卢子兴,廖强,杨振宇,俸翔,张中伟,冯志海.C/SiC复合材料螺栓螺牙承载能力[J].复合材料学报,2015,32(1):182-187.
作者姓名:卢子兴  廖强  杨振宇  俸翔  张中伟  冯志海
作者单位:1. 北京航空航天大学 航空科学与工程学院, 北京 100191; 2. 航天材料及工艺研究所, 北京 100076
摘    要:为了对C/SiC复合材料螺栓螺牙的承载能力进行评估, 采用有限元法和刚度折减方法对C/SiC复合材料螺牙抵抗拉脱的能力进行了研究。结果表明: 当齿合螺牙数大于6时, 再增加齿合螺牙数已不能有效地提高螺牙的初始拉脱载荷;增大螺距会降低螺牙初始拉脱强度, 因而也不能显著地提高螺牙的初始拉脱载荷;在螺距与螺栓直径之比保持常数的情况下, 螺牙的初始拉脱载荷与螺栓直径的平方成正比;而螺牙的极限拉脱载荷则近似正比于齿合螺牙数、螺距及螺栓直径。

关 键 词:C/SiC复合材料螺栓  螺牙拉脱失效  刚度折减方法  初始拉脱载荷  极限拉脱载荷  
收稿时间:2014-01-20

Load bearing capability of thread teeth of C/SiC composite bolts
LU Zixing,LIAO Qiang,YANG Zhenyu,FENG Xiang,ZHANG Zhongwei,FENG Zhihai.Load bearing capability of thread teeth of C/SiC composite bolts[J].Acta Materiae Compositae Sinica,2015,32(1):182-187.
Authors:LU Zixing  LIAO Qiang  YANG Zhenyu  FENG Xiang  ZHANG Zhongwei  FENG Zhihai
Institution:1. School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China; 2. Institute of Space Material Technology, Beijing 100076, China
Abstract:In order to evaluate the load bearing capability of thread teeth of C/SiC composite bolts, finite element method and stiffness degradation method were used to study the load bearing capability of the thread teeth of C/SiC composite bolts. The results show that when the number of teeth engaged is more than six, the initial pull-off load of thread teeth almost does not increase with the number of teeth engaged increasing, and it also can not be increased significantly by solely increasing the pitch of thread for this will decrease the initial pull-off strength of thread teeth; when the ratio of thread teeth to bolt diameter is constant, the initial pull-off load of thread teeth is proportional to the square of bolt diameter; however, the ultimate pull-off load of the thread teeth is nearly proportional to the number of teeth engaged, the pitch of thread and bolt diameter.
Keywords:C/SiC composite bolt  thread teeth pull-off damage  stiffness degradation method  initial pull-off load  ultimate pull-off load
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