| Summary: | 碩士 === 中原大學 === 機械工程研究所 === 89 ===
ABSTRACT
The natural frequency of the rectangular plate with a straight crack analysis is investigated in this study. Using ANSYS5.5 software to build two dimensional finite element mesh of the rectangular plate, and selection the geometry of element mesh around crack tip, the natural frequency of the rectangular plate with the straight crack is determined. In the crack of geometry range, the ratio of crack length to the plate length is considered between 0.0 and 0.5. And the aspect ratio of the plate is considered between 0.5 and 2.5. The natural frequencies under the different boundary conditions (C-F-F-F and S-S-S-S) and the different positions of the crack length in the plate are considered. By comparing the natural frequency for different crack length with appropriated published results, the variations of natural frequency on center and edge location have been discussed. Based on ANSYS results of natural frequency of rectangular plate with straight crack, the dimensionless frequency parameters are determined by curve fitting technique. The dimensionless frequency parameter of the rectangular plate decreases with increasing of the crack length. The dimensionless frequency parameter of simply supported plate increases with the increasing the aspect ratio in this study.
|
|---|
