Acoustic Emission as an Index of Submarine Hull Integrity.
Abstract
Two large flat steel plates (one 6X20 ft., 2 in. thick of HY-80; the other 8X18 ft., 2-1/2 in. thick of HY-140) are used as test specimens to realistically evaluate with respect to size the wave propagation characteristics of acoustic emissions. Wide band transducers, amplifiers and video-tape recorders are used to capture and store the acoustic signals generated by various means. The video-tapes are then analyzed by replay to an oscilloscope and a spectrum analyzer. Preliminary data reduction indicates that sound propagates faithfully over appreciable distances. However a distinction is not apparent, in the frequency domain, between emissions from crack extension and signals from other sources not related to this phenomenon. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1974
- Accession Number
- AD0774490
Entities
People
- H. H. Chaskelis
Organizations
- United States Naval Research Laboratory