C/SiC复合材料螺钉拉伸强度分布模型  

Tensile Strength Distribution Model of C/SiC Composite Material Bolts

作　　者：袁建宇[1] 逄锦程[1] 王影[1] 谢国君[1] 卢克非 YUAN Jianyu;PANG Jincheng;WANG Ying;XIE Guojun;LU Kefei(Aerospace Research Institute of Materials & Processing Technology,Beijing 100076)

机构地区：[1]航天材料及工艺研究所

出　　处：《宇航材料工艺》2019年第5期74-78,共5页Aerospace Materials & Technology

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。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 distributionmodel,witha characteristic strengthβ212 MPa and a shape parameterα9.45.Moreover,the allowable strength design can be realized based on the present Weibull distribution.

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 

分 类 号：TB33[一般工业技术—材料科学与工程]