Damping in Porcelain Enamel Coatings.
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 Young's 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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1976
- Accession Number
- ADA031774
Entities
People
- Prabha Iyengar Sridharan
Organizations
- University of Minnesota