Research Equipment for Damage Characterization in Structural Solids

Abstract

(1) Theoretical modeling of some of the problems associated with the above described topics presented a challenge. The complex nature of the geometry as well as the materials involved precluded the application of purely analytical methods for their solution. We were able to use conventional BEM for topic #2 and a hybrid form of the FEM for topic//4, but these methods did not work well for the other topics. A new numerical technique, called the volume integral equation method (VIEM), was developed to calculate the elastostatic as well as elastodynamic fields in structural components of large lateral extent containing localized multiple inclusions and flaws. The technique has clear advantages in accuracy and efficiency over conventional FEM and BEM in calculating the effects of local "microstructure" under remote loading. This is considered to be a major contribution to the literature in structural and solid mechanics. (2) A detailed study of the mechanisms for the degradation of SiC/Ti composites under fatigue loading was carried out leading to the following accomplishments.

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Document Details

Document Type
Technical Report
Publication Date
Oct 09, 2000
Accession Number
ADA383915

Entities

People

  • Ajit K. Mal

Organizations

  • University of California, Los Angeles

Tags

Communities of Interest

  • Air Platforms
  • Sensors
  • Space

DTIC Thesaurus Topics

  • Composite Materials
  • Integral Equations
  • Integrals
  • Jet Propulsion
  • Laminates
  • Laser Peening
  • Material Degradation Processes
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Mechanical Properties
  • Mechanics
  • Micromechanics
  • Structural Components
  • Wave Propagation

Readers

  • Materials Science (Mechanical Engineering).
  • Reinforced Composite Materials
  • Structural Dynamics.