Evaluation of Three Methods for Dynamic Elastic Modulus of Steel

Authors: A. Wolfenden, W. Schwanz, Texas A & M University, Mechanical Engineering Dept. (1995)

Abstract

An evaluation is made of three methods used to determine the dynamic elastic modulus of steel. The three methods make use of the Grindo-Sonic machine, the Modul-r machine, and the Piezoelectric Ultrasonic Composite Oscillator Technique. Testing of specimens, all from the same piece of stock, was done using each method and a comparison was performed. Since the assumption that all specimens had the same elastic modulus was not valid, a comprehensive statistical comparison could not be done. Still, all methods produced results that were highly repeatable. In addition, it was determined that long thin specimens did not vibrate in their fundamental mode when tested with the Grindo-Sonic machine and that testing specimens with the Modul-r machine heats the internal coils of the machine which affects the determined modulus values. The width tolerance needed for the Modul-r specimens could not be maintained, and the results of tests on these specimens are not completely valid. The overall mean elastic modulus was 207.1 Gpa with a standard deviation of 2.75 GPa.

More info here: https://doi.org/10.1520/JTE10407J