Accession Number:

ADA305938

Title:

Stress Wave Attenuation in Thin Structures by Ultrasonic Through-Transmission.

Descriptive Note:

Contract rept.,

Corporate Author:

MASSACHUSETTS INST OF TECH CAMBRIDGE

Report Date:

1980-01-01

Pagination or Media Count:

34.0

Abstract:

The steady-state amplitude of the output of an ultrasonic through-trans mission measurement is analyzed and the result is given in closed form. Provided that the product of the input and output transduction ratios the specimen-transducer reflection coefficient the specimen-transducer phase shift parameter and the material phase velocity are known, this analysis gives a means for determining the through-thickness attenuation of an individual thin sample. Multiple stress wave reflections are taken into account and so signal echoes do not represent a difficulty. An example is presented for a graphite fiber epoxy composite Hercules As3501-6. Thus, the technique provides a direct method for continuous or intermittent monitoring of through-thickness attenuation of plate structures which may be subject to service structural degradation. MM

Subject Categories:

  • Laminates and Composite Materials
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE