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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 new method of measuring Young’s modulus of metal beam based on fiber Bragg grating (FBG) sensor and three-point bending test is proposed. The FBG is pasted on the metal beam to be tested, and the load on the metal beam to be tested is measured by three-point bending test. A universal formula for measuring the Young’s modulus of any rigid solid material in sheet form is derived. The formulas are respectively used for the Young’s modulus measurement of iron beam and copper beam. The results show that the error between the measured value and the nominal value obtained by the FBG sensor is 0.5% and 0.6%, respectively, and the reflected center wavelength of the FBG has a good linear relationship with the load. In addition, FBG paste location has little effect on the measurement results. This method has potential application in the measurement of Young’s modulus of rigid solid materials.