SINGLE SPECIMEN DETERMINATION OF YOUNGS AND BULK MODULI

A new method is presented for the rapid and consecutive determination of the Young's and bulk moduli of polymeric materials. Usually these properties are determined by separate measurements. However, by using an undersized specimen in a standard compressibility device it has been found possible consecutively to determine both moduli on the same specimen in a single test procedure. The initial loading of the undersized specimen results in a decrease in length and an increased diameter. From these changes Young's modulus may be calculated. Once the bore of the tester is filled, the application of additional pressure results in a decrease in the volume of the polymer, from which the bulk modulus may be calculated. Both of these determinations may be made within minutes, and the values of the moduli are in agreement with published values. Copyright © 1968 John Wiley & Sons, Inc.