Topology Optimization and Additive Manufacturing of Customized Sports Item Considering Orthotropic Anisotropy

다국어 초록 (Multilingual Abstract)

Topology optimization is a shape optimization method connected with finite element (FE) structural analysis, and has recently received increasing attention owing to rapid evolution of additive manufacturing (AM). In this study, a rifle support for the sport biathlon is developed by combining three-dimensional (3D) scanning, FE analysis, topology optimization, and AM. Considering that the biathlon requires a stable shooting motion under hard breathing after a distance of cross-country skiing, the rifle support was designed to be fitted to a human body based on 3D scanning data. Topology optimization was then performed to reduce the part weight efficiently, and its structural safety and stiffness were evaluated by FE analyses considering the orthotropic material properties and the relevant printing directions. The optimized design and printing direction were showed 12.7% improvements in the specific stiffness and 23–43% improvements in the structural safety according to the direction. The final design was fabricated using a fused deposition modeling type 3D printer with acrylonitrile butadiene styrene filament. Compression tests were then performed to evaluate its structural safety, and the resulting relative critical force showed a 40% improvement in comparison with the original design.

참고문헌 (Reference)

1 Rezaie, R., "Topology optimization for fused deposition modeling process" 6 : 521-526, 2013

2 김용호, "Topological Shape Optimization Scheme Based on the Artificial Bee Colony Algorithm" 한국정밀공학회 18 (18): 1393-1401, 2017

3 Baca, A., "Stability analysis of motion patterns in biathlon shooting" 31 (31): 295-302, 2012

4 Gaynor, A., "Multiple-material topology optimization of compliant mechanisms created via PolyJet three-dimensional printing" 136 (136): 061015-, 2014

5 장성우, "Multiphase Design Exploration Method for Lightweight Structural Design: Example of Vehicle Mounted Antenna-Supporting Structure" 한국정밀공학회 2 (2): 281-287, 2015

6 Kotlinski, J., "Mechanical properties of commercial rapid prototyping materials" 20 (20): 499-510, 2014

7 Kim, Y. K., "Eff ects of custom-made 3D printed insoles for fl at feet people on gait parameters" 195-198, 2017

8 임영은, "Design for additive manufacturing of customized cast with porous shell structures" 대한기계학회 31 (31): 5477-5483, 2017

9 Zegard, T., "Bridging topology optimization and additive manufacturing" 53 (53): 175-192, 2016

10 Hoff man, M. D., "Biathlon shooting performance after exercise of diff erent intensities" 13 : 270-273, 1992

11 임영은, "Automatic Design of 3D Conformal Lightweight Structures Based on a Tetrahedral Mesh" 한국정밀공학회 5 (5): 499-506, 2018

12 Kok, Y., "Anisotropy and heterogeneity of microstructure and mechanical properties in metal additive manufacturing : A critical review" 139 (139): 565-586, 2018

13 Dewhurst, P., "An investigation of minimum-weight dual-material symmetrically loaded wheels and torsion arms" 72 (72): 196-202, 2005

14 Chen, R. K., "Additive manufacturing of custom orthoses and prostheses—A review" 12 : 77-89, 2016

15 Tam, K. M. M., "Additive manufacturing along principal stress lines" 4 (4): 63-81, 2017

16 Rozvany, G. I., "A critical review of established methods of structural topology optimization" 37 (37): 217-237, 2009

17 Chee Meng Benjamin Ho, "A Review on 3D Printed Bioimplants" 한국정밀공학회 16 (16): 1035-1046, 2015