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Correlation of stress-wave-emission characteristics with fracture aluminum alloysA study to correlate stress wave emission characteristics with fracture in welded and unwelded aluminum alloys tested at room and cryogenic temperature is reported. The stress wave emission characteristics investigated were those which serve to presage crack instability; viz., a marked increase in:(1) signal amplitude; (2) signal repetition rate; and (3) the slope of cumulative count plotted versus load. The alloys were 7075-T73, 2219-T87 and 2014-T651, welded with MIG and TIG using 2319 and 4043 filler wire. The testing was done with both unnotched and part-through-crack (PTC) tension specimens and with 18-in.-dia subscale pressure vessels. In the latter testing, a real time, acoustic emission, triangulation system was used to locate the source of each stress wave emission. With such a system, multiple emissions from a given location were correlated with defects found by conventional nondestructive inspection.
Document ID
19720022820
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Hartbower, C. E. (Aerojet Solid Propulsion Co. Sacramento, CA, United States)
Reuter, W. G. (Aerojet Solid Propulsion Co. Sacramento, CA, United States)
Morais, C. F. (Aerojet Solid Propulsion Co. Sacramento, CA, United States)
Crimmins, P. P. (Aerojet Solid Propulsion Co. Sacramento, CA, United States)
Date Acquired
September 2, 2013
Publication Date
July 1, 1972
Publication Information
Publisher: NASA
Subject Category
Materials, Metallic
Report/Patent Number
NASA-CR-2072
Accession Number
72N30470
Funding Number(s)
CONTRACT_GRANT: NAS8-21405
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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