TY - JOUR
T1 - Acoustic Nonlinearity Parameters Due to Microstructural Defects
AU - Gao, Xiang
AU - Qu, Jianmin
N1 - Publisher Copyright:
© 2018, The Chinese Society of Theoretical and Applied Mechanics.
PY - 2018/10/1
Y1 - 2018/10/1
N2 - This study presents a general approach to derive the acoustic nonlinearity parameters induced by various types of dislocation configurations including dislocation strings (monopoles), dislocation dipoles, dislocation pileups and extended dislocations. It is found that expressions of the acoustic nonlinearity parameter induced by such a variety of dislocation configurations share a common mathematical form. They are all scaled with (Lch/b)n, where Lch is a characteristic length of the dislocation configuration, b is the magnitude of the Burgers vector, and n is either 3 or 4. Semiquantitative analysis is presented to compare the magnitudes of the acoustic nonlinearity parameters among different types of dislocation configurations.
AB - This study presents a general approach to derive the acoustic nonlinearity parameters induced by various types of dislocation configurations including dislocation strings (monopoles), dislocation dipoles, dislocation pileups and extended dislocations. It is found that expressions of the acoustic nonlinearity parameter induced by such a variety of dislocation configurations share a common mathematical form. They are all scaled with (Lch/b)n, where Lch is a characteristic length of the dislocation configuration, b is the magnitude of the Burgers vector, and n is either 3 or 4. Semiquantitative analysis is presented to compare the magnitudes of the acoustic nonlinearity parameters among different types of dislocation configurations.
KW - Acoustic nonlinearity parameter
KW - Dislocations
KW - Microstructural defects
KW - Nondestructive evaluation
KW - Nonlinear ultrasound
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U2 - 10.1007/s10338-018-0053-3
DO - 10.1007/s10338-018-0053-3
M3 - Article
AN - SCOPUS:85056449145
SN - 0894-9166
VL - 31
SP - 525
EP - 534
JO - Acta Mechanica Solida Sinica
JF - Acta Mechanica Solida Sinica
IS - 5
ER -