INVERSE MODELING OF 3D HALF-SPACE SURFACE CRACK

• Main Authors: HSIEH, FU-PIN, 謝福斌
• Other Authors: MAO-KUEN KUO
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/11789427552874469453

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.