Modeling the interaction of ultrasound with poresFactors that affect ultrasonic velocity sensing of density during consolidation of metal powders are examined. A comparison is made between experimental results obtained during the final stage of densification and the predictions of models that assume either a spherical or a spheroidal pore shape. It is found that for measurements made at low frequencies during the final stage of densification, relative density (pore fraction) and pore shape are the two most important factors determining the ultrasonic velocity, the effect of pore size is negligible.
Document ID
19930054969
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Lu, Yichi (NASA Headquarters Washington, DC United States)
Wadley, Haydn N. G. (NASA Headquarters Washington, DC United States)
Parthasarathi, Sanjai (Virginia Univ. Charlottesville, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: Nondestructive evaluation and material properties of advanced materials; Proceedings of the Symposium, TMS Annual Meeting, New Orleans, LA, Feb. 17-21, 1991 (A93-38964 15-38)