INVERSE MODELING OF 3D HALF-SPACE SURFACE CRACK
碩士 === 國立臺灣大學 === 應用力學研究所 === 85 === This paper outlines the inverse modeling of a 3D half-space surface crack. The arrival time of the first diffractive wave is employed to distinguish the differences of the diffractive location of the wave through surface cracks...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
1997
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| Online Access: | http://ndltd.ncl.edu.tw/handle/11789427552874469453 |
| Summary: | 碩士 === 國立臺灣大學 === 應用力學研究所 === 85 === This paper outlines the inverse modeling of a 3D half-space surface crack.
The arrival time of the first diffractive wave is employed to distinguish the
differences of the diffractive location of the wave through surface cracks
with uniform depth and nonuniform depth. We further introduce the inversion
concept of the crack function to avoid the unfeasibility of tip-by-tip
inversion in nonuniform depth and with obliquity. The depth and obliquity of
cracks are evaluated by the crack function and the inclination, which are
based on the numerical optimization. The numerical optimization takes
advantage of adaptive simulated annealing method incorporated with simplex
method. This kind of method is demonstrated to be applicable to depict the
shape of the tips of a surface crack, and the depth and the obliquity of the
surface crack could thus be identified.
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