A general model for dislocation contribution to acoustic nonlinearity
School of Mechanical and Power Engineering, East China University of Science and Technology Shanghai 200237, PRC
Received: 3 February 2014
Accepted: 3 March 2014
A general model considering the nonlinear stress-strain relationship of the bowed-out dislocation line with arbitrary orientation is proposed for the generation of acoustic nonlinearity of the mixed dislocation. Results show that the acoustic nonlinearity depends on the orientation of the dislocation line and exhibits a significant nonlinearity with the fraction of screw dislocation. This indicates that the traditional linear weighted method may cause an overestimation of acoustic nonlinearity. The proposed model is further validated by the experimental measurements of the cold rolled plate of 304 stainless steel (SS).
PACS: 43.25.+y – Nonlinear acoustics / 81.40.Ef – Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization / 61.72.Ff – Direct observation of dislocations and other defects (etch pits, decoration, electron microscopy, x-ray topography, etc.)
© EPLA, 2014