非接触式激光测微法测定炭纤维单丝拉伸应变及模量  

Non-contact Measurement of Tensile Strain and Modulus for Single Filament of Carbon Fibers by Laser Micrometry Method

作　　者：费又庆[1,2] 宁晓魏 欧阳婷[1] 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082 [2]湖南大学汽车车身先进设计制造国家重点实验室,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2017年第6期57-62,共6页Journal of Hunan University:Natural Sciences

基　　金：中央高校基本科研业务费专项资金资助项目(531107022124);湖南大学汽车车身先进设计制造国家重点实验室课题(734215002)~~

摘　　要：本研究在常规强伸仪上引入了非接触式激光测微模块直接测量单丝炭纤维拉伸时标记物的微小位移,使得新测试系统可以同时准确地测量炭纤维单丝的强度、模量和断裂应变,而无需常规方法中复杂的系统校正.通过对炭纤维T300试样的测试可知,激光测微法的准确性和稳定性优于常规测试方法,并且能清晰地检测到炭纤维在受力过程中存在的非虎克行为.结果表明,激光测微法中标记物作为纤维变形的载体成为准确测量的关键标记,应选择有较好遮光性的材料并且垂直于纤维轴粘贴,标记的测量边最好为线性,在保证一定测量范围的前提下尽可能减小标记尺寸.A non-contact laser micrometer was introduced to a conventional single filament tensile tes- ting instrument to directly measure small displacement of stiff fiber samples, allowing strength, modulus and strain of single filaments to be measured simultaneously and accurately. Complicated system corrections were eliminated by using this laser micrometry method. Experimental results obtained from T300 carbon fibers agreed well with the data provided by manufacturer in term of accuracy, a nonlinearity in modulus for the carbon fiber sample was observed during extension, further indicating that laser mi- crometry method is capable of measuring strain and modulus directly and accurately, especially for high modulus materials.The markers attached to the fiber specimen appeared to be the key to accurate measure- ments, the effects of the shape, size and material of markers were experimentally studied. It is showed that markers should be ooaaue with straight parallel sides and perpendicular to the fiber axis.

关 键 词：炭纤维 模量 激光测微法 单丝 

分 类 号：TB302.3[一般工业技术—材料科学与工程]