Design for Buckling Strength of Ring-Doubler Reinforced Rectanguler Plates Containing a Circular Cutout

• Main Authors: Chia-chi Chang, 張家琪
• Other Authors: 張銘永
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/26366375493381153329

碩士 === 中興大學 === 機械工程學系所 === 95 === Aircraft structure such as bulkhead webs, floor panels and the skin often consist of the many plate-like flat structures. In the design of these structural elements, the buckling strength is often the most critical factor to be considered. The plate structure having a hole cut out for the purpose of the installation of the wire’s or pipe’s system, usually needs reinforcement in the periphery of the hole in order to lower the working stress and increase the structure’s stability. In this thesis studies are carried out on the structural stability of the aluminum rectangular plate containing a ring-plate reinforced circular hole. Various parameters such as the length-widths ratios, hole dimensions, the dimensions and thickness of the reinforced plate, boundary condition and loading type are considered. The CAE analysis tool, MSC/NASTARN is used to design and create the charts of the buckling strength factor involving these parameters. Using the above buckling factor charts for plates with a reinforced hole and finding the buckling stress (e.g., extracted it from design manuals) for the same plate but with no hole on it, one can determine the critical buckling allowable stress of the plate with a ring-plate reinforced hole. The optimization of the weight of the ring-plate reinforced rectangular plate containing a circular hole is also considered in the thesis. The optimization modulus of MSC/NASTRAN is utilized to create the design factor charts. By giving the plate’s thickness and the external load, the optimal reinforced plate can be determined from the optimized design factor charts.