Stress Wave Attenuation in Thin Structures by Ultrasonic Through-Transmission.
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 As/3501-6). 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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1980
- Accession Number
- ADA305938
Entities
People
- James H. Williams Jr.
- Samson S. Lee
Organizations
- Massachusetts Institute of Technology