抗氧化碳/碳复合材料螺钉设计方法研究  

Design method of anti-oxidation C/C composite screw

作　　者：常园园 王捷冰 董耀军 王乾 冯韶伟 CHANG Yuanyuan;WANG Jiebing;DONG Yaojun;WANG Qian;FENG Shaowei(Beijing Institute of Astronautical Systems Engineering,Beijing 100076,China;Science and Technology on Space Physics Laboratory,Beijing 100076,China)

机构地区：[1]北京宇航系统工程研究所,北京100076 [2]空间物理重点实验室,北京100076

出　　处：《哈尔滨工程大学学报》2022年第7期1006-1012,共7页Journal of Harbin Engineering University

基　　金：钱学森青年创新基金项目。

摘　　要：针对C/C复合材料紧固件失效模式多、承载低且无设计标准的特点,本文对影响沉头螺钉承力的公称直径D、钉头高度H、钉头角度α、螺纹啮合深度h等4个设计变量进行分析,结合抗氧化C/C复合材料力学性能特点,提出抗氧化C/C复合材料螺钉的设计方法,分析涂层对螺钉承载的影响,给出设计变量与材料性能之间关系:H>D×σ_(t)/(4×ζ)、α>ctan(ζ/σ_(c))、h>3H(螺牙进行抗氧化涂层处理后可稍微减小h,但也需大于2H)。该设计方法消除螺纹拉脱、钉头拉脱/压溃等C/C复合材料螺钉的失效模式,大幅度提升螺钉承载能力。设计验证实验,通过实验考核螺钉结构形式及设计方法的正确性,验证抗氧化涂层工艺对螺钉承载的影响。In light of many failure modes,low bearing capacity,and lack of a design standard for C/C composite fasteners,this paper analyzes the four design variables of countersunk head screws-nominal diameter D,nailhead height H,countersunk head angleα,and length of thread engagement h,considers the mechanical performance characteristics of anti-oxidation C/C composite,and proposes a design method of anti-oxidation C/C composite screw.The effect of anti-oxidant coating on the screw bearing is analyzed,and the relationship between design vari-ables and material properties is given:H>D×σ_(t)/(4×ζ);α>ctan(ζ/σ_(c));h>3H(h can slightly be reduced after anti-oxidation coating treatment of thread,but it also needs to be greater than 2H).The design method eliminates the failure modes of C/C composite screws,such as thread pulling off and nail head pulling off/squashing to collapse,significantly improving the bearing capacity of the screws.The design verification test verifies the correct-ness of the screw structure and design method,as well as the influence of the anti-oxidation coating process on screw load.

关 键 词：C/C复合材料 抗氧化涂层 螺纹连接件 设计方法 设计变量 螺纹拉脱 钉头拉脱 失效模式 

分 类 号：TB332[一般工业技术—材料科学与工程]