Uncertainty in the determination of elastic modulus by tensile testing

The paper presents the results of theoretical and experimental research related to the uncertainty in the elastic modulus measurement on different types of tensile testing devices and their comparison. Factors that affect the uncertainty in the measurement of the elastic modulus were defined. Analytical limits of the uncertainty in the elastic modulus, i.e. the limits of acceptable uncertainties, were determined. The mean values of the uncertainties in the elastic modulus are 1.97% on a conventional tensile testing device with an extensometer and 1.56% on a small laboratory tensile testing device. In the region of lower forces and small elongations, the uncertainty in the elastic modulus measurement has higher values, which is primarily caused by the imperfections of measuring instrumentation. (C) 2021 Karabuk University. Publishing services by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

This paper presents the results of theoretical and experimental research on the uncertainty in elastic modulus measurement using different types of tensile testing devices, and compares their results. Factors affecting the uncertainty in elastic modulus measurement are defined, and analytical limits for acceptable uncertainties are determined. The average uncertainties in elastic modulus are found to be 1.97% on a conventional tensile testing device with an extensometer, and 1.56% on a small laboratory tensile testing device. It is observed that the uncertainty in elastic modulus measurement is higher in the region of lower forces and small elongations, mainly due to imperfections in measuring instrumentation.