摘要
面向SiO2编织纤维增强SiO2(WFSiO2/SiO2)复合材料在胞体层面的表面形貌测量工程,提出了一种三维测量方法.针对采样参数设置不合理,会造成测量结果失真的问题,设计开发了一种确定最大采样步长的方法.该方法利用误差估计的统计学原理,建立了任意采样参数下获得的测量结果与准确测量值之间的误差的概率密度关系,并在此基础上提出了判断特定采样步长得到的测量结果是否可靠的准则,进而可以确定使测量结果符合工程要求的最大采样步长,从而将由采样引起的测量结果误差控制在最大残差的15%范围内.应用本文提出的方法确定了3种WFSiO2/SiO2复合材料的胞体最大采样步长,数值分别为7μm、6μm和8μm.研究了WFSiO2/SiO2复合材料的微观组织结构对其胞体层面的最大采样步长的影响,注意到材料所用的编织纤维直径在6~8μm之间.根据纤维直径与胞体最大采样步长之间的数值关系可以判明:在胞体层面,WFSiO2/SiO2复合材料的最大采样步长与其微观重复性特征具有密切关系,数值上约等于其微观的增强纤维直径;利用本方法确定的最大采样步长,可以实现WFSiO2/SiO2复合材料胞体表面不失真的采样与测量分析.该研究成果作为编织纤维增强复合材料纤维束-胞体-全表面测量评价体系的一个环节,为该种材料更可靠的表面质量检测和工程应用奠定了基础.
A three-dimensional measurement method was proposed for the surface topographical measurement engineering of SiO2 woven,fiber reinforced SiO2 matrix(WFSiO2/SiO2)composite on the cell body scale.In order to solve the problem of improperly set sampling parameters,the measurement result may be distorted.Thus,a method to determine the maximum sampling step(Max SS)was designed.The method was based on the statistical principle of error estimation.It established the probability density of the error between the measurement results obtained under random sampling parameters and the accurate values.A criterion was then put forward to judge whether the measurement results of the specific sampling step length were reliable.Eventually,the Max SS could be determined by making the measurement results meet the requirements of the project.This method could control the measurement error caused by sampling within 15%of the maximum residual.The MaxSS of three WFSiO2/SiO2 composites were determined using the proposed method,with values of 7μm,6μm,and 8μm respectively.The influence of the microstructure of WFSiO2/SiO2 composite on the MaxSS of the cell body scale was studied,noting that the diameters of the fibers were 6-8μm.The numerical relationship between the fiber diameter and the MaxSS could show that,on this scale,the MaxSS of a WFSiO2/SiO2 composite material was closely related to its microscopic repeatability,and was approximately equal to the diameter of its microscopic reinforcing fiber.The Max SS determined by this method can be used to achieve undistorted sampling and measurement of the WFSiO2/SiO2 composite cell body.As a part of the measurement and evaluation system of the fiber bundle,cell body,and whole surface of the woven,fiber-reinforced composites,the results of this research can lay a foundation for more reliable surface quality detection and engineering applications of these types of materials.
作者
王玉果
王皓吉
林彬
魏金花
方胜
Wang Yuguo;Wang Haoji;Lin Bin;Wei Jinhua;Fang Sheng(Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education,Tianjin University,Tianjin 300072,China;Key Laboratory of Advanced Functional Composites,CASC,Beijing 101312,China)
出处
《天津大学学报（自然科学与工程技术版）》
EI
CSCD
北大核心
2020年第6期609-616,共8页
Journal of Tianjin University：Science and Technology
基金
国家自然科学基金资助项目(51375333,51305296).
关键词
长纤维编织增强复合材料
表面测量
最大采样步长
石英纤维
long fiber reinforced woven composites
surface measurement
maximum sampling step
quartz fiber
