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21 to 28 of 28 Results
Piezopumps Using no Physically Moving Parts
Jul 21, 1999
Chang, Z.; Bar-Cohen, Y., 1999, "Piezopumps Using no Physically Moving Parts", https://hdl.handle.net/2014/17811, ['NASA/JPL Workshop on Miniature Vacuum Pump Tech.', 'Glendale, CA, USA'], JPL Open Repository
No abstract provided
Composite Materials NDE Using Enhanced Leaky Lamb Wave Dispersion Data Acquisition Method
Mar 22, 1999
Bar-Cohen, Y.; Mal, A.; Lih, S. S.; Chang, Z., 1999, "Composite Materials NDE Using Enhanced Leaky Lamb Wave Dispersion Data Acquisition Method", https://hdl.handle.net/2014/16620, ['8th ASNT Research Symposium', 'Orlando, Florida, USA'], JPL Open Repository
No abstract provided
System Modelling of Rotary Ultrasonic Motors
Mar 1, 1999
Bar-Cohen, Y.; Bao, X.; Chang, Z., 1999, "System Modelling of Rotary Ultrasonic Motors", https://hdl.handle.net/2014/20195, Newport Beach, CA, U.S.A., JPL Open Repository
No abstract provided
Composite Materials Stiffness Determination and Defects Characterization Using Enhanced Leaky Lamb Wave Dispersion Data Acquisition
Mar 1, 1999
Bar-Cohen, Y.; Lih, Shyh-Shiuh; Chang, Z.; Mal, A. K., 1999, "Composite Materials Stiffness Determination and Defects Characterization Using Enhanced Leaky Lamb Wave Dispersion Data Acquisition", https://hdl.handle.net/2014/20196, ['SPIE Annual International Symposium', 'Newport Beach, CA, U.S.A.'], JPL Open Repository
No abstract provided
Composite Materials Stiffness Determination and Defects Characterization Using Enhanced Leaky Lamb Wave Dispersion Data Aquisition Method
Mar 1, 1999
Bar-Cohen, Y.; Mal, A. K.; Lih, S. S.; Chang, Z., 1999, "Composite Materials Stiffness Determination and Defects Characterization Using Enhanced Leaky Lamb Wave Dispersion Data Aquisition Method", https://hdl.handle.net/2014/20706, ['SPIE Annual International Symposium', 'Newport Beach, CA, U.S.A.'], JPL Open Repository
The leaky Lamb waves (LLW) technique is approaching a maturity level that is making it attractive quantitative NDE tool for composites and bonded joints.
Characterization of Defects in Composite Material Using Rapidly Acquired Leaky Lamb Wave Dispersion Data
May 25, 1998
Bar-Cohen, Y.; Mal, A.; Chang, Z., 1998, "Characterization of Defects in Composite Material Using Rapidly Acquired Leaky Lamb Wave Dispersion Data", https://hdl.handle.net/2014/18994, ['European Conference on NDE', 'Copenhagen, Denmark'], JPL Open Repository
The phenomenon of Leaky Lamb Wave (LLW) in composite materials was first observed in 1982 using a Schlieren system. It has been studied extensively by numerous investigators and successfully shown to be an effective quantitative NDE tool.
Material Properties and Defects Characterization Using LLW Data
Mar 31, 1998
Bar-Cohen, Y.; Mal, A.; Chang, Z., 1998, "Material Properties and Defects Characterization Using LLW Data", https://hdl.handle.net/2014/18935, ["MFG: SPIE's NDE for Aging Structures & Manufacturing", 'San Antonio, Texas, USA'], JPL Open Repository
Leaky Lamb Wave (LLW) propagation in composite materials has been studied extensively since it was first observed in 1982. The wave is induced using a pitch-catch arrangement and the plate wave modes are detected by identifying minima in the reflected spectra to obtain the disper...
Defects Detection and Characterization Using Leaky Lamb Wave (LLW) Dispersion Data
Mar 24, 1998
Bar-Cohen, Y.; Mal, A.; Chang, Z., 1998, "Defects Detection and Characterization Using Leaky Lamb Wave (LLW) Dispersion Data", https://hdl.handle.net/2014/19033, ['MTG: ANST Spring Conference', 'Anaheim, California, USA'], JPL Open Repository
Composite materials are being used at a significant level of usage for flaw critical structures and they are taking a growing percentage of the makeup of aircraft and spacecraft. Composite structues are now reaching service duration, for which the issue of aging is requiring adqu...
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