SURFACE CRACKING CAUSED BY ELECTROMAGNETIC WAVE ABSORPTION
Abstract
An Exploding Wire Facility has been used to irradiate glass disks to determine any damaging effects. At power levels of 10 to the 7th power watts deposited in the wire, the glass surface became crazed. Photo-micrographs and profilometer measurements of the surface are presented to support the following conjectures as to the cause of cracking: the energy radiated by the hot wire is absorbed by a thin surface layer of the glass, the temperature rises creating thermal stresses, flaws below the glass surface form stress raisers according to the Griffith crack theory, and the cracks propagate to the surface. The theoretical derivation of the adapted thermoelastic stress theory predicts the dimensions of the cracks and the power levels required if the absorption coefficient is at least 10 to the 3rd power reciprocal centimeters.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 28, 1962
- Accession Number
- AD0273970
Entities
People
- R. C. Good Jr.
Organizations
- General Electric