Title: Measurement of physical characteristics of materials by ultrasonic methods

Abstract

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.

Inventors:

Lu, Wei-yang ^[1]; Min, Shermann ^[2]

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+ Show Inventor Affiliations

1. Pleasanton, CA
2. Livermore, CA

Issue Date:

Thu Jan 01 00:00:00 EST 1998

Research Org.:

Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA (United States)

OSTI Identifier:

871824

Patent Number(s):

5804727

Assignee:

Sandia Corporation (Livermore, CA)

Patent Classifications (CPCs):

G - PHYSICS G01 - MEASURING G01H - MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES

G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES

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G - PHYSICS G01 - MEASURING G01H - MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES

G01H5/00 - Measuring propagation velocity of ultrasonic, sonic or infrasonic waves {, e.g. of pressure waves}

G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES

G01N2291/0234 - Metals, e.g. steel
G01N2291/0235 - Plastics
G01N2291/02827 - Elastic parameters, strength or force
G01N2291/0289 - Internal structure, e.g. defects, grain size, texture
G01N2291/0421 - Longitudinal waves
G01N2291/0422 - Shear waves, transverse waves, horizontally polarised waves
G01N2291/0423 - Surface waves, e.g. Rayleigh waves, Love waves
G01N2291/0427 - Flexural waves, plate waves, e.g. Lamb waves, tuning fork, cantilever
G01N29/07 - by measuring propagation velocity or propagation time of acoustic waves
G01N29/2418 - {using optoacoustic interaction with the material, e.g. laser radiation, photoacoustics
G01N29/38 - by time filtering, e.g. using time gates
G01N29/40 - by amplitude filtering, e.g. by applying a threshold {or by gain control}
G01N29/449 - {Statistical methods not provided for in G01N29/4409, e.g. averaging, smoothing and interpolation}

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DOE Contract Number:  

AC04-94AL85000

Resource Type:

Patent

Country of Publication:

United States

Language:

English

Subject:

measurement; physical; characteristics; materials; ultrasonic; methods; method; described; determining; evaluating; material; particular; provides; anisotropic; especially; resulting; manufacturing; processes; rolling; forming; extruding; drawing; forging; etc; operation; complex; wave; created; form; combination; types; modes; limited; fundamental; plate; velocity; propagation; selected; components; measured; evaluated; determine; including; texture; strain; stress; grain; size; crystal; structure; ultrasonic wave; plate modes; wave form; manufacturing process; physical characteristics; grain size; material including; crystal structure; selected components; plate mode; ultrasonic method; selected component; physical characteristic; manufacturing processes; /73/