Title page for ETD etd-011899-160431


Type of Document Dissertation
Author Rezaizadeh, Mohammad Ali
Author's Email Address mzadeh@vt.edu
URN etd-011899-160431
Title Pulsed-Laser Ultrasound Generation in Fiber-Reinforced Composite Material
Degree PhD
Department Engineering Mechanics
Advisory Committee
Advisor Name Title
Duke, John C. Jr. Committee Chair
Hasselman, D. P. H. Committee Member
Kriz, Ronald D. Committee Member
Mook, Dean T. Committee Member
Reifsnider, Kenneth L. Committee Member
Keywords
  • Laser
  • Composite
  • NDE
  • Ultrasound
  • Pulsed
Date of Defense 1998-11-03
Availability unrestricted
Abstract
A laser-based ultrasonic technique using a pulsed laser for stimulating ultrasonic waves in fiber-reinforced composite materials is the subject of investigation. For convenience, the material is chosen to be homogeneous transversely isotropic. The study is strictly limited to the laser power regimes that are suitable for nondestructive evaluation. An elastodynamic methodology is presented based on integral formulation in order to develop a representation for the dynamic responses in terms of the characteristics of the source that originated the motion. This requires a computation of elastodynamic Green function which represents the displacement field from the idealized synthetic sources localized precisely in both space and time. A two-dimensional numerical analysis utilizing a finite difference method for computation of the Green function in a finite plate is developed which provides the basis for quantitative nondestructive evaluation of fiber reinforced composite materials. Numerical results are presented for the surface displacement at the epicenter. Prediction based on numerical simulations are compared with experimental results.

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