STRUCTURAL RESPONSE TO INTENSE ELECTROMAGNETIC RADIATION
Abstract
An Exploding Wire Facility was used as the source of electro-magnetic radiation. Power levels of 10 to the 7th power watts were deposited in the wire and the radiation pulse was focused on small specimens of selected materials through reflection in an ellipsoidal mirror. For glass samples, the surface crazed to a depth of 1/1000 cm. 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 associated temperature rise generates thermal stresses, flaws below the glass surface form stress raisers according to the Griffith crack theory, and the cracks subsequently 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 1000 reciprocal centimeters. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 28, 1962
- Accession Number
- AD0275042
Entities
People
- Robert C. Jr. Good
Organizations
- General Electric