Interference Contrast Reveals Debonding

Journal Article · Thu Nov 01 00:00:00 EDT 2007 · Advanced Materials and Processes

OSTI ID:931162

Boatner, Lynn A ^[1]; Longmire, Hu Foster ^[1]; Gray, Allison S ^[1]

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1. ORNL

The elastic constants of single crystals can be determined by the high-frequency 'pulse-echo' superposition method, in which a piezoelectric transducer that is bonded to a single crystal sends stress pulses into the sample. The round-trip transit time of these pulses, t, is measured by overlapping the leading cycles of the first two echoes that are reflected back to the transducer. The sound velocity is then found by the relationship V = 2l/t, where l represents the length of the sample. By transmitting the ultrasonic waves along different crystallographic directions, values for the various elastic constants can be calculated by the relationship C = {rho}V{sup 2}.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 931162
• Journal Information: Advanced Materials and Processes, Vol. 165, Issue 11; ISSN 0882-7958
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MONOCRYSTALS
TRANSDUCERS
ULTRASONIC TESTING
PULSES
ELASTICITY
Interference Contrast Reveals Debonding 70Fe-15-Ni-15Cr ternary alloy