Simulations of surface waves generated using laser ultrasonics

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Computer programs for solving the thermoplastic equations describing wave generation and propagation caused by the interaction of a laser pulse with a metal surface have been developed over the last several years. One approach is to manipulate the thermoelastic equations using transform techniques and then use numerical methods to invert the equations and solve for wave displacements. Another approach is to spatially discretize the geometry of the model using finite elements and integrate the equations of motion through time. The finite element formulation may be fully coupled or as a further approximation the thermal problem can be solved separately from ... continued below

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10 p.

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J. J. Dike, SNL /CA & T. M. Sanderson, Georgia Institute of Technology July 20, 1998.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Computer programs for solving the thermoplastic equations describing wave generation and propagation caused by the interaction of a laser pulse with a metal surface have been developed over the last several years. One approach is to manipulate the thermoelastic equations using transform techniques and then use numerical methods to invert the equations and solve for wave displacements. Another approach is to spatially discretize the geometry of the model using finite elements and integrate the equations of motion through time. The finite element formulation may be fully coupled or as a further approximation the thermal problem can be solved separately from the mechanical problem. The work reported here sought to develop a technique to use a commercial finite element code (ABAQUS [4]) to simulate surface waves generated in laser ultrasonics. A general purpose finite element code provides the advantages of large element and material libraries and the ability to consider complex geometries and boundary conditions. Sanderson's computer code, which solves the coupled thermoplastic problem using numerical transform techniques, was used to validate the finite element model developed. Validation was performed using simple models and boundary conditions. Subsequent finite element simulations were used to examine the effects of simulated stress gradients (in-plane and through-thickness) on waveforms. Temperature dependent properties and the effect of including an elastic-plastic constitutive material model in the mechanical analysis were also briefly examined.

Physical Description

10 p.

Notes

OSTI as DE00755825

Medium: P; Size: 10 pages

Source

  • Quantitative Nondestructive Evaluation '98, Snowbird, UT (US), 07/20/1998--07/24/1998

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  • Report No.: SAND98-8658C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 755825
  • Archival Resource Key: ark:/67531/metadc710498

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • July 20, 1998

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 6, 2017, 7:06 p.m.

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J. J. Dike, SNL /CA & T. M. Sanderson, Georgia Institute of Technology. Simulations of surface waves generated using laser ultrasonics, article, July 20, 1998; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc710498/: accessed July 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.