Accession Number : AD0657181

Title :   THE GENERATION OF THERMOELASTIC STRESS WAVES BY IMPULSIVE ELECTROMAGNETIC RADIATION.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF THE AEROSPACE AND MECHANICAL ENGINEERING SCIENCES

Personal Author(s) : Morland,L. W.

Report Date : JUL 1967

Pagination or Media Count : 31

Abstract : The absorption of electromagnetic radiation within a thin, but finite, surface layer of an elastic half-space provides a sudden heat source distribution through the layer, and stress waves are generated. A solution for uni-axial motion is given in the limit situation when the pulse duration approaches zero in comparison with the wave travel time through the layer, together with the neglect of thermal diffusion on this time scale. The radiation absorption is assumed to decay exponentially with depth. These simplifying features lead to stress wave profiles which clearly illustrate the effective nature of the solution. In the case when the surface is stress free, after the initial build-up (here instantaneous) of compressive stress within the layer, a tensile wave propagates out of the layer. Numerical data are presented to show that the peak tensile stress can attain significant levels within a few layer thicknesses of the surface. (Author)

Descriptors :   (*ELECTROMAGNETIC RADIATION, ABSORPTION), (*STRESSES, ELECTROMAGNETIC RADIATION), SURFACE PROPERTIES, INTERACTIONS, HEAT TRANSFER, ELASTIC PROPERTIES, ELECTROMAGNETIC PULSES, LASERS, MATHEMATICAL ANALYSIS, BOUNDARY VALUE PROBLEMS, SOLIDS

Subject Categories : Mechanics
      Electromagnetic Pulses

Distribution Statement : APPROVED FOR PUBLIC RELEASE