Torsional Pendulum Study on Several Rubber Compounds.
Abstract
The goal of this investigation was to determine the shear properties on various rubber compounds using a low frequency (approximately equal to 1 Hz) measurement - torsional pendulum (TP) - to determine the damping and modulus as a function of temperature (-175 to 80 C). By applying WLF shift the damping and modulus were presented as a function of frequency (1 to 100 kHz, 10 C). From this data, the shear sound speed and absorption were calculated. From this investigation the rubber compounds are characterized as follows: The glass transition temperatures were found to be in a relative narrow range between -45 and -33 C. By changing the formulation the damping varied by a factor of 6; the modulus changed as much as a factor of a 330; the sound speed varied by a factor of 16; and finally, the absorption changed by a factor of 10, as a function of frequency. The TP is a good method for determining the acoustic properties of rubber compounds provided the WLF shift constants are known.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 04, 1977
- Accession Number
- ADA038735
Entities
People
- G. F. Lee
Organizations
- Naval Ordnance Laboratory