6Xue T, Lord W, Udpa S. Numerical analysis of the radiated fields of ultrasonic transducers[J]. Journal of Nondestructive Evaluation, 1995,14 (3) : 137 -146.
7Datta D, Kishore N N. Features of ultrasonic wave propagation to identify defects in composite materials modeled by finite element method[J]. NDT&E International, 1996,29 (4) :213-223.
8Kishore N N, Sridhar I, Iyengr N G R. Finite element modeling of ultrasonic waves by isolated flaws [J]. NDT&E International, 2000,33 (5) : 297-305.
9Joseph L Rose. Ultrasonic Wave in Solid Media[M]. Cambridge: Cambridge University Press,1999.
