The effect of carbon concentration and plastic deformation on ultrasonic higher order elastic properties of steelThe behavior of higher order elastic properties, which are much more sensitive to material state than are second order properties, has been studied for steel alloys AISI 1016, 1045, 1095, and 8620 by measuring the stress derivative of the acoustic natural velocity to determine the stress acoustic constants (SAC's). Results of these tests show a 20 percent linear variation of SAC's with carbon content as well as even larger variations with prestrain (plastic deformation). The use of higher order elastic characterization permits quantitative evaluation of solids and may prove useful in studies of fatigue and fracture.
Document ID
19850059187
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Heyman, J. S. (NASA Langley Research Center Hampton, VA, United States)
Allison, S. G. (NASA Langley Research Center Hampton, VA, United States)
Salama, K. (Houston, University TX, United States)