Reanalysis Methods for Structures with Laser Induced Damage.

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)

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1983
Accession Number
ADA135874

Entities

People

  • S. K. Bryan

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Aircrafts
  • Energy
  • Engineering
  • Finite Element Analysis
  • Heat Balance
  • Heat Energy
  • Heat Transfer
  • Laser Beams
  • Lasers
  • Material Degradation Processes
  • Materials
  • Modulus Of Elasticity
  • Stress Strain Relations
  • Stresses
  • Structural Analysis
  • Thermal Stresses

Fields of Study

  • Engineering
  • Physics

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Pulsed Power and Plasma Physics.
  • Structural Health Monitoring of Composite Structures.

Technology Areas

  • Directed Energy