Ultrasonic characterization of plastic deformation in metalsAcoustic tone burst spectroscopy is used to examine the effect of plastic deformation on higher order elastic properties of specimens of AISI 1016, 1045, 1095 and 8620 steel rods by measuring the stress acoustic constants (SACs). The SAC is found to be influenced by prestraining, and prestrain SAC measurements on 8620 steel demonstrate similar behavior to previously measured steels even though the composition of 8620 steel is significantly different. It is suggested from bias stress measurements that the stress acoustic response of prestrained 8620 steel is sensitive to the sign of the applied stress due to the different directions is which dislocations move under tension as opposed to compression, providing an approach to nondestructive testing of residual stress in steels.
Document ID
19870023519
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Allison, S. G. (NASA Langley Research Center Hampton, VA, United States)
Heyman, J. S. (NASA Langley Research Center Hampton, VA, United States)
Salama, K. (Houston, University TX, United States)