Accession Number : AD0774490
Title : Acoustic Emission as an Index of Submarine Hull Integrity.
Descriptive Note : Memorandum rept.,
Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C
Personal Author(s) : Chaskelis,H. H.
Report Date : JAN 1974
Pagination or Media Count : 22
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)
Descriptors : *Submarine hulls, *Nondestructive testing, *Acoustic emissions, Acoustic waves, Metal plates, Steel, Cracks, Sound transmission
Subject Categories : Fabrication Metallurgy
Test Facilities, Equipment and Methods
Distribution Statement : APPROVED FOR PUBLIC RELEASE