摘要
提出基于光纤布拉格光栅(FBG)传感器和三点弯曲测试法测量金属梁杨氏模量的新方法。将FBG粘贴在待测金属梁上,采用三点弯曲测试法对待测金属梁进行负荷,推导出了一个具有普适性的,可以测量任意片状刚性固体材料的杨氏模量的公式,利用该公式分别对铁梁和铜梁的杨氏模量测量进行了实验研究。结果表明,采用FBG传感器测得的结果与标称值的误差分别为0.5%和0.6%,并且FBG的反射中心波长与负荷具有良好的线性关系。另外,FBG粘贴位置对测量结果影响不大。该方法在刚性固体材料杨氏模量的测量中有着潜在的应用前景。
A novel technique for measuring Young′s modulus of metal beams based on fiber Bragg gratings（FGBs）and three-point bend test is proposed. The FBG is sticked on the target metal beam and the three-point bend test method is used to load the force on the sheet. A universal formula for measuring Young′s modulus of various sheetshaped solid materials is derived, which is used for the experimental measurement of the Young′s modulus of iron and copper sheets. Experimental results show that the measurement errors of the two metal beams are 0.5% and 0.6%comparing to the nominal Young′s modulus, and the relationship between the reflected central wavelength and the loaded force is a good linearity. Moreover, the stick location of FBG has a negligible impact on the measurement precision. The proposed method has a potential application prospect in the field of Young′s modulus measurement of solid materials.
出处
《激光与光电子学进展》
CSCD
北大核心
2016年第4期52-57,共6页
Laser & Optoelectronics Progress
基金
国家自然科学基金(61307096)
广西省自然科学基金(2014GXNSFBA118282)
广西省高校科学技术重点项目(ZD20140213)
