Item Details

Correlation of Stress-Wave-Emission Characteristics With Fracture Aluminum Alloys

C.E. Hartbower ... [et al.]
Format
Book; Government Document; Online; EBook
Published
Washington, D.C. : National Aeronautics and Space Administration ; Springfield, Va. : For sale by the National Technical Information Service [distributor], 1972.
Language
English
Series
NASA Contractor Report
Summary
A 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.
Description
xiv, 201, A1-A18 p. : ill. ; 27 cm.
Mode of access: Internet.
Notes
  • "NASA CR-2072."
  • "July 1972."
  • Cover title.
  • Includes bibliographical references (p. A1-A18).
Series Statement
NASA contractor report ; NASA CR-2072
Other Forms
Also available via Internet from the NASA Technical Reports Server (http://ntrs.nasa.gov/). Address as of 6/22/06: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720022820%5f1972022820.pdf.
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Technical Details

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    a| Correlation of stress-wave-emission characteristics with fracture aluminum alloys / c| C.E. Hartbower ... [et al.].
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    a| Washington, D.C. : b| National Aeronautics and Space Administration ; a| Springfield, Va. : b| For sale by the National Technical Information Service [distributor], c| 1972.
    300
      
      
    a| xiv, 201, A1-A18 p. : b| ill. ; c| 27 cm.
    490
      
    0
    a| NASA contractor report ; v| NASA CR-2072
    500
      
      
    a| "NASA CR-2072."
    500
      
      
    a| "July 1972."
    500
      
      
    a| Cover title.
    504
      
      
    a| Includes bibliographical references (p. A1-A18).
    520
      
      
    a| A 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.
    530
      
      
    a| Also available via Internet from the NASA Technical Reports Server (http://ntrs.nasa.gov/). Address as of 6/22/06: http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19720022820%5f1972022820.pdf.
    536
      
      
    a| Prepared by Advanced Technology, Aerojet Solid Propulsion Company, Sacramento, Calif. for National Aeronautics and Space Administration b| NAS 8-21405
    538
      
      
    a| Mode of access: Internet.
    650
      
    0
    a| Stress waves.
    650
      
    0
    a| Aluminum alloys x| Fracture.
    650
      
    7
    a| Welding. 2| nasat
    650
      
    7
    a| Wave propagation. 2| nasat
    650
      
    7
    a| Structural failure. 2| nasat
    650
      
    7
    a| Stress waves. 2| nasat
    650
      
    7
    a| Fatigue tests. 2| nasat
    650
      
    7
    a| Cracking (fracturing) 2| nasat
    650
      
    7
    a| Aluminum alloys. 2| nasat
    650
      
    7
    a| Acoustic measurement. 2| nasat
    700
    1
      
    a| Hartbower, Carl E.
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    2
      
    a| Advanced Technology. b| Aerojet Solid Propulsion Company.
    974
      
      
    b| UIU c| UIUC d| 20141113 s| google u| uiug.30112106860031 y| 1972 r| pd q| bib

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