Accession Number:

ADA031774

Title:

Damping in Porcelain Enamel Coatings.

Descriptive Note:

Final rept. Aug 71-Sep 74,

Corporate Author:

MINNESOTA UNIV MINNEAPOLIS DEPT OF AERONAUTICS AND ENGINEERING MECHANICS

Personal Author(s):

Report Date:

1976-07-01

Pagination or Media Count:

224.0

Abstract:

Equipment was developed and tested which was used for measuring the complex elastic moduli of thin porcelain enamel coatings at temperatures where they became very soft. Previous work has been done in glasses, almost exclusively at relatively low temperatures, to measure the effects of ionic diffusion or other chemical activation changes or at high temperatures where one is dealing with a melt. Measurements from ten to the 2nd power to ten to the 12th power Poise have been conducted mainly for production control and have relied on standard tests. The present work shows how the storage and loss portions of the shear and Youngs modulus can be measured directly as functions of temperature and frequency and proposes a general relation which depends only on the room temperature modulus, the activiation energy, the critical temperature and one other parameter which gives the relaxation spectrum bandwidth. Author

Subject Categories:

  • Ceramics, Refractories and Glass
  • Coatings, Colorants and Finishes
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE