Abstract：The elastic modulus of metal materials was measured by the static method and the resonance method, respectively. In the static method, an electronic universal testing machine and extensometer were used for the tensile test of dumbbell-shaped bar samples, and the slope of the elastic section of the engineering stress-engineering strain curve was used to calculate the elastic modulus. In the resonance method, the bending resonance test of rectangular free beam sample was carried out by using dynamic elastic modulus and damping analyzer, and the elastic modulus was indirectly measured according to the relationship between the elastic modulus and the fundamental bending frequency. According to the standard for evaluation and expression of uncertainty in measurement, the measurement uncertainty of elastic modulus by static method and resonance method was compared using 7075 aviation aluminum alloy as an example. The results showed that the maximum uncertainty of static method was the deformation error measured by extensometer, and the maximum uncertainty of resonance method was the thickness measurement error. The measurement results by resonance method were better than those by static method. The measurement uncertainty analysis could provide reference for the selection of measurement methods and evaluation of results of elastic modulus.
ASTM International. ASTM E1876-2022 Standard Test Method for Dynamic Young′s Modulus, Shear Modulus, and Poisson′s Ratio by Impulse Excitation of Vibration[S]. West Conshohocken, PA, 2022.
ISO/TC 164/SC 1 Uniaxial testing technical committee. Metallic materials-Tensile testing-Part 1: Method of test at room temperature: ISO 6892-1:2019[S].[S.1.]:[s. n.],2019.
[16]
Lord J D, Morrell R. Measurement Good Practice Guide No. 98 Elastic Modulus Measurement[M]. UK: National Physical Laboratory, 2006.
2023, Vol. 41 
