Accession Number : ADA135874

Title :   Reanalysis Methods for Structures with Laser Induced Damage.

Descriptive Note : Master's thesis,

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

Personal Author(s) : Bryan,S K

PDF Url : ADA135874

Report Date : Mar 1983

Pagination or Media Count : 118

Abstract : A reanalysis method to analyze the strength of a structure which has encountered a laser strike is developed. The method accounts for the following types of laser induced damage: (1) loss of structure due to melting; (2) change of material properties due to temperature changes; and (3) addition of load due to thermal stress. The program uses heat balance calculations over successive finite time increments on an array of finite elements bisecting the laser beam spot to determine the temperature distribution. These results are then converted to structural stiffness parameters and the structural analysis is performed using a finite element based reanalysis method. The reanalysis method predicts the damage effects from the initial undamaged solution. The program was found to give good results consistent with results obtained from a separate analysis for each damage condition, but with less computer time and manhours. (Author)

Descriptors :   *COMPUTER PROGRAMS, *COMPUTATIONS, *STRUCTURAL RESPONSE, *LASER DAMAGE, *DAMAGE ASSESSMENT, STRENGTH(GENERAL), LASER WEAPONS, HEAT BALANCE, FINITE ELEMENT ANALYSIS, MELTING, TEMPERATURE, THERMAL STRESSES, AIRCRAFT DEFENSE SYSTEMS, MATHEMATICAL MODELS, THESES

Subject Categories : Lasers and Masers
      Numerical Mathematics
      Computer Programming and Software
      Structural Engineering and Building Technology

Distribution Statement : APPROVED FOR PUBLIC RELEASE