Accession Number : AD0447218


Title :   ELASTIC MODULUS OF POLYMERS FROM RESONANT FLEXURE OF CLAMPED DISKS,


Corporate Author : EXPLOSIVES RESEARCH AND DEVELOPMENT ESTABLISHMENT WALTHAM ABBEY (UNITED KINGD OM)


Personal Author(s) : Roberts, J


Report Date : 18 Feb 1964


Pagination or Media Count : 1


Abstract : An electrostatic technique which utilizes the electrostatic charge on the surface of a polymer is used to detect the vibrations of a centrally clamped disk in forced vibration. An advantage of the technique is that is measures velocity resonance, and hence the natural frequency from which flexural modulus is calculated. Values of specific loss are obtained by extending the method to measure the phase difference between the applied force and the deformation. In this paper experiments using thin disks vibrating with a single nodal diameter at room temperature are described. The polymers tested are poly(methyl methacrylate) and four types of polyethylene. It is suggested that the technique will have other applications, one example being the flexural testing of metals, which is briefly described. (Author)


Descriptors :   *POLYMERS , *ACRYLIC RESINS , DETERMINATION , VIBRATION , DEFORMATION , RESONANCE , UNITED KINGDOM


Distribution Statement : APPROVED FOR PUBLIC RELEASE