AbstractAn ultrasonic interferometer was used to measure the sound velocity at 1.45 Mcycle/sec. and 20°C. in small disk samples of polyethylene. A plot of sound velocity versus density does not conclusively show that the relationship is linear or cubic. The velocities were converted to dynamic Young's moduli by using Poisson's ratios given by Schuyer. Comparison of these results with the lower frequency moduli of Davidse, Waterman, and Westerdijk indicates that the test conditions may well be close to those pertaining when the viscoelastic effects have been more or less eliminated.

The dynamic bulk modulus of polymethylmethacrylate (PMMA) is measured at a frequency of 1 Mc/s using an ultrasonic interferometer. The polymer tested is in the form of a thin disc specimen or a powder.

Australian and New Zealand Journal of SurgeryVolume 24, Issue 4 p. 251-259 CANCER OF THE BREAST IN SYDNEY TEACHING HOSPITALS W. J. Pullen, W. J. Pullen THE ROYAL PRINCE ALFRED HOSPITALSearch for more papers by this authorJ. W. Spence, J. W. Spence THE ROYAL PRINCE ALFRED HOSPITALSearch for more papers by this authorAlan Sharp, Alan Sharp THE SYDNEY HOSPITALSearch for more papers by this authorJ. P. Fleming, J. P. Fleming ST. VINCENT'S HOSPITALSearch for more papers by this authorV. H. Cumberland, V. H. Cumberland THE ROYAL NORTH SHORE HOSPITALSearch for more papers by this author W. J. Pullen, W. J. Pullen THE ROYAL PRINCE ALFRED HOSPITALSearch for more papers by this authorJ. W. Spence, J. W. Spence THE ROYAL PRINCE ALFRED HOSPITALSearch for more papers by this authorAlan Sharp, Alan Sharp THE SYDNEY HOSPITALSearch for more papers by this authorJ. P. Fleming, J. P. Fleming ST. VINCENT'S HOSPITALSearch for more papers by this authorV. H. Cumberland, V. H. Cumberland THE ROYAL NORTH SHORE HOSPITALSearch for more papers by this author First published: May 1955 https://doi.org/10.1111/j.1445-2197.1955.tb06954.xCitations: 4AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinkedInRedditWechat Citing Literature Volume24, Issue4May 1955Pages 251-259 RelatedInformation