Accession Number : AD0780631

Title :   Pressure Produced by Vaporization as a Mechanism for Removing Melt from a Target Subjected to Laser Radiation.

Descriptive Note : Master's thesis,

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

Personal Author(s) : Bittner,Martin M.

Report Date : MAR 1974

Pagination or Media Count : 138

Abstract : An analysis was made of the effect of pressure generated by vaporization of the surface of a thin slab irradiated with a high intensity laser beam. A finite element analysis was used to obtain numerical solutions of the heat and flow equations, and a computer program was developed to perform the required calculations. Titanium and aluminum slabs 0.08 and 0.127 cm thick were analyzed for response to pressure effects using peak absorbed intensities of 10,000 to 140,000 watts/sq cm. Pressures in the low pressure regime were predicted by the model, and the model predicted that melt removal afrom the area of flux incidence occurred. The most significant effect was a reduction in time required to melt the rear surface of the slab over the time computed on a strictly two dimensional heat flow analysis. Slab thickness, material properties, and peak absorbed intensities all contributed to the overall effect. (Author)

Descriptors :   *Laser beams, *Heating, Titanium, Aluminum, Vaporization, Vapor pressure, Thermophysical properties, Heat transmission, Theses

Subject Categories : Lasers and Masers
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE