Cellular solids having soft-and-stiff characteristics

2016 Fiscal Year Final Research Report

• Project/Area Number: 25709001
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Materials/Mechanics of materials
• Research Institution: Osaka University (2016); The University of Tokyo (2013-2015)
• Principal Investigator: TANAKA Hiro 大阪大学, 工学(系)研究科(研究院), 助教 (70550143)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: 柔剛特性 / 可変機構 / 8回回転対称 / 正方セル / 変形遷移 / 分岐現象 / ポアソン比

Outline of Final Research Achievements

It enables us to introduce a new mechanical design if structures potentially adjust their stiffness to reflect various changing circumstances. In this study, we proposed the concept of soft-and-stiff characteristics that the stiffness is passively switched according to different load conditions, and engaged the basic research going forward into its creation. Concretely, we numerically clarified that a specific cellular solid exhibits a deformation transition as increasing the internal stiffness and the overall stiffness changes dramatically during the transition. It was also proved that a similar transition mechanism exists within a periodic linked structure with low degrees of freedom. We in parallel developed the orthotropic laminated cellular structures retaining strong auxeticity in the stacking direction as a part of optimized structural system enhancements.

Free Research Field

固体力学