By Glen Wade (auth.), Yu Wei, Dr. Benli Gu (eds.)
The one zero five theses contained during this publication are chosen from these whose authors have been current on the twentieth overseas Symposium on Acoustical Imaging. held at Southeast collage. Nanjing. China. in the course of September 12-14. 1992. It was once the 1st time that the symposium have been held in China. Our efforts to host the convention is going again to the fifteenth foreign Symposium on Acoustical Imaging held in Halifax. Canada. in 1986. we're completely happy that the 20 th symposium has been effectively held ultimately. we're ardent for the symposium not just simply because we connect a lot significance to the sector of acoustical imaging. but in addition simply because we respect the culture of the intense educational exploration and pleasant cooperation of the students attending the symposium. The theses during this ebook are from 21 nations and people through Mr. G. Wade. Takuso Sato. J. F. Greenleaf. ok. J. Langenberg. and Wencai Yang are the specifically invited papers. those theses conceal such very important fields of acoustical imaging as follows: 1. arithmetic and physics of acoustical imaging; 2. elements and program; three. functions in drugs and biology; four. functions in nondestructive trying out; five. functions in geophysics; 6. Underwater acoustical imaging. these kind of theses mirror the newest development in idea and expertise. we're very thankful to all of the authors who've supplied those theses.
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1 Introduction Nondestructive estimation of the stress condition in metal is required in many field. The conditions may be expressed as the existence of residual stress from the manufacturing processes such as rolling and welding processes, or as the magnitude of the stress value to give the limit of the elastic deformation. In this chapter, first the 6130 ------~---------, nonlinear dependency of sound I Al (A~052) I! cr t.. ·· .. and its expression by using high 6125 .............. · .... % order elastic constants is given.
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Icr4 6110L---~~-~~~~-~~~-~ 0 20 40 60 80 100 Compressional Stress [MPa] Fig. 2 Measurement of Nonlinear Dependence of Ultrasonjc Sound Velocity on Stress A result of the sound velocity change measurement under applied stress is as shown in Fig. 7. 0 x 10-4 . After the limit value LlC changes to decrease. We are going to use this characteristics with proper stress perturbation Llcr as is also shown in the figure. 3 Expression of Nonlinear Dependence by usin~ hi~h order Elastic Constants Let us assume that the relation between stress T and strain S is given as follows where = Tyy T5 = Txz T2 and f, g and h are 1st, 2nd and 3rd order elastic constants, respectively.
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