Accession Number : AD0775707

Title :   Thermal Response Calculations and Their Role in the Design of Experiments.

Descriptive Note : Technical rept.,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING

Personal Author(s) : Torvik,Peter J.

Report Date : DEC 1973

Pagination or Media Count : 54

Abstract : The prediction of temperatures and the times required for complete melt through in metal sheets subjected to continuous laser irradiation is considered. Analytical and numerical methods for predicting the thermal responses are discussed and applied so as to obtain general conclusions on the influence of radial conduction, vaporization, and melt removal mechanisms on the melt through time. Some results from a recent series of experiments are presented and interpreted. Absorptivities of bare titanium and stainless steel at two intensities, together with the absorptivities of painted samples of titanium, stainless steel, magnesium and aluminum are all determined by two methods and the results compared. A comparison between experimental and computed data suggests the presence of several interesting phenomena, worthy of further study. The data also suggests the possibility of sufficient energy being released due to the burning of paint to be of significance at laser intensities of one kilowatt per square centimeter, or less. (Modified author abstract)

Descriptors :   *Metals, Heating, Sheets, Melting, Thermal properties, Stainless steel, Titanium, Magnesium, Aluminum, Paints, Thermal radiation, Energy, Numerical analysis, Experimental design, Lasers

Subject Categories : Physical Chemistry
      Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE