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Measurement of physical characteristics of materials by ultrasonic methods

United States Patent

*** EXPIRED ***
September 8, 1998
View the Complete Patent at the US Patent & Trademark Office
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A method is described for determining and evaluating physical characteristics of a material. In particular, the present invention provides for determining and evaluating the anisotropic characteristics of materials, especially those resulting from such manufacturing processes as rolling, forming, extruding, drawing, forging, etc. In operation, a complex ultrasonic wave is created in the material of interest by any method. The wave form may be any combination of wave types and modes and is not limited to fundamental plate modes. The velocity of propagation of selected components which make up the complex ultrasonic wave are measured and evaluated to determine the physical characteristics of the material including, texture, strain/stress, grain size, crystal structure, etc.
Lu; Wei-yang (Pleasanton, CA), Min; Shermann (Livermore, CA)
Sandia Corporation (Livermore, CA)
08/ 522,682
September 1, 1995
STATEMENT OF GOVERNMENT INTEREST This invention was made with Government support under contract no. DE-AC04-94AL8500 awarded by the U. S. Department of Energy to Sandia Corporation. The Government has certain rights in the invention.