Development of Topology Optimization Design for Crashworthiness Structures

• Main Authors: Fu-Chun Teng, 鄧福君
• Other Authors: Chin-Chun Cheng
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/18546388659993341906

碩士 === 國立中正大學 === 機械工程所 === 96 === The thesis focus on developing a design tool used in crashworthiness design. An algorithm which integrates the finite element software ANSYS/LS-DYNA used as the structural analysis tool, the optimization module based on the sequential linear programming, and a topology module, is developed. An adaptive filter technique in which the filter size is changed adaptively in each iteration according to the topology quality is utilized not only to avoid problems of mesh-dependency and the checkerboard patterns but also to achieve a high topology quality. Based on this algorithm, a crashworthiness design of a packaging box used in LCD packaging is demonstrated as an example. This packaging box protects the fragile LCD from damage and it requires to take up a volume as small as possible for a certain number of panels in order to reduce the transportation cost. In contrast to the traditional approach which targets minimizing the acceleration and/or the maximal stress of the panel contained in the packaging box, the objective is to minimize simultaneously the pre-designated natural frequency and the mean compliance of a packaging box subject to a minimal volume. The finite element model of a packaging box with twenty five panels is validated by a drop test experiment. Then the packaging box after topology optimization is utilized to predict the design improvement in terms of shock resistance and volume reduction numerically. Numerical results show that the optimal layout of the packaging box not only has a smaller volume, 14.85% less than the original design, but also has a smaller maximal acceleration of the panel 8.9% less.