| Summary: | 碩士 === 國立中山大學 === 機械工程研究所 === 83 ===
In this paper, a hybrid method combines finite element method, optimum theory, and holographic interferometry is introduced. Then the position and size of a defect contained inside a plate can be determined quantitatively from the loaded plate's fringe pattern produced by using holographic interferometry.
The rectangular aluminum plate is adopted for the test specimen, and an unpenetrative cylindrical hole is used to simulate the internal defect. The holographic interference pattern induced by tension is obtained first, then a theoretically pattern obtained by the finite element analysis incorporating with optimization is compared with the holographic interference pattern. The softwares PATRAN3 and ABAQUS are applied for the theoretical analysis, and the iterative theoretical analysis is repeated until both experimental and theoretical patterns fit each other. Then the position and size of the defect are obtained.
Two examples are presented in this paper in order to discuss the suitability of the proposed method. The results shows that if the loading condition is well controled, then the proposed method can predict the position and size of the defect quite accurately.
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