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C/SiC复合材料螺钉拉伸强度分布模型
袁建宇1,逄锦程1,王影1,谢国君1,卢克非1
航天材料及工艺研究所,北京 100076
摘要:
C/SiC复合材料螺钉是在高超声速飞行器上应用越来越广泛的一类重要紧固件,但其拉伸性能存在较大散差,分布规律尚不明确,给材料选用和结构设计带来了很大困难。本文采用电子万能试验机对M8、M10、M12三种规格的平头C/SiC复合材料螺钉进行力学性能试验,并分析了拉伸强度的分布规律。在此基础上应用双参数Weibull模型对统计数据进行拟合,并对拟合结果进行了柯尔莫哥洛夫检验。结果表明:C/SiC复合材料螺钉的拉伸性能分布满足双参数Weibull模型,其特征强度β为212 MPa,形状参数α为9.45,可以据此进行复合材料许用强度设计。
关键词:  C/SiC复合材料  螺钉  拉伸强度  Weibull模型  柯尔莫哥洛夫检验
DOI:10.12044/j.issn.1007-2330.2019.05.015
分类号:TB33
基金项目:
Tensile Strength Distribution Model of C/SiC Composite Material Bolts
YUAN Jianyu1,PANG Jincheng1,WANG Ying1,XIE Guojun1,LU Kefei1
Aerospace Research Institute of Materials & Processing Technology,Beijing 100076
Abstract:
C/SiC composite material bolt was a kind of important fastener that applied in hypersonic vehicles widely.However,the mechanical properties of this material had a relatively large amount of scatter while the distribution pattern still remained in blurry, resulting in significant difficulty in material selection and structure design.In this paper,tensile strength testing experiments were conducted using three kinds of C/SiC composite material bolts (M8,M10,M12) on an electronic-controlled universal testing machine.The probability distribution pattern of tensile strength was obtained.The two-parameter Weibull distribution model was fitted based on the statistical data,and the Kolmogorov-Smirnove test was conducted.The results indicate that the tensile strength distribution of C/SiC composite material bolts accords with the Weibull distribution model,with a characteristic strength β 212 MPa and a shape parameter α 9.45.Moreover,the allowable strength design can be realized based on the present Weibull distribution.
Key words:  C/SiC composite material  Bolts  Tensile strength  Weibull distribution model  Kolmogorov-Smirnove test