Method and apparatus for measuring stress

Patent · Tue Jun 11 00:00:00 EDT 1985

OSTI ID:865473

Thompson, R Bruce ^[1]

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1. Ames, IA

A method and apparatus for determining stress in a material independent of micro-structural variations and anisotropies. The method comprises comparing the velocities of two horizontally polarized and horizontally propagating ultrasonic shear waves with interchanged directions of propagation and polarization. The apparatus for carrying out the method comprises periodic permanent magnet-electromagnetic acoustic transducers for generating and detecting the shear waves and means for determining the wave velocities.

• Research Organization: Ames Laboratory (AMES), Ames, IA; Iowa State Univ., Ames, IA (United States)
• DOE Contract Number: W-7405-ENG-82
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4522071
• Application Number: 06/518,243
• OSTI ID: 865473
• Country of Publication: United States
• Language: English

Related Subjects

method
apparatus
measuring
stress
determining
material
independent
micro-structural
variations
anisotropies
comprises
comparing
velocities
horizontally
polarized
propagating
ultrasonic
shear
waves
interchanged
directions
propagation
polarization
carrying
periodic
permanent
magnet-electromagnetic
acoustic
transducers
generating
detecting
means
wave
ultrasonic shear
acoustic transducer
shear waves
shear wave
method comprises
permanent magnet
method comprise
acoustic transducers
electromagnetic acoustic
measuring stress
horizontally polarized
structural variations
/73/