Bulk Modulus of Elasticity of Various Elastomers: Theory and Experiment

Abstract

A simple theoretical model for the bulk modulus of elastomers based upon the free volume concept is described. It gives a static (zero frequency) bulk modulus which exhibits a temperature dependence similar to chain theories of shear and Young's moduli. At higher temperatures, the model gives an Arrhenius-type behavior. The frequency dependence is developed from generalization of a single relaxation time hereditary model using the method bolic functional dependencies of the storage and loss moduli upon frequency. These function are consistent with the time-temperature superposition principle and can be used to construct master curves using the WLF frequency shift method. Experimental data have been obtained for a number of rubbery elastomers using an acoustic coupler method. Details of the experimental arrangement are described together with results obtained. Generally, values of the bulk modulus are found to closely resemble those of typical organic liquids. Recent data have permitted construction of master curves for several samples, and the parameters for these curves are given.

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Document Details

Document Type
Technical Report
Publication Date
Jun 05, 1987
Accession Number
ADA183259

Entities

People

  • Jay Burns
  • Pieter S. Dubbelday
  • Robert Y. Ting

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Energy and Power Technologies
  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Accuracy
  • Bulk Modulus
  • Elastic Properties
  • Elastomers
  • Experimental Data
  • Frequency
  • Frequency Shift
  • Glass Transition Temperature
  • High Temperature
  • Materials
  • Measurement
  • Modulus Of Elasticity
  • Molecules
  • Phase Transformations
  • Polymers
  • Relaxation Time
  • Transition Temperature

Readers

  • Aerospace Test and Evaluation
  • Materials Science and Engineering.
  • Mechanical Engineering/Mechanics of Materials.