Development of programmable soft materials by controling residual stress

• Project/Area Number: 15K17941
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Materials/Mechanics of materials
• Research Institution: Shimane University
• Principal Investigator: Morimoto Takuya 島根大学, 総合理工学研究科, 准教授 (30451660)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 座屈 / 残留応力 / 残留ひずみ / ミスフィットひずみ / エラストマ / 形状記憶ポリマー / ソフトマテリアル / しわ / 曲げ / 曲率

Outline of Final Research Achievements

To create programmable soft materials that can transform a 2D plane to a 3D surface by controlling residual stress, we considered two experimental systems using elastomers or shape memory polymers (SMPs). The local expansion or shrinkage in the material induces non-uniform stress fields and can lead to the out-of-plane deformation through residual swelling in the elastomer system or light absorption in the SMP system. These experimental results show that there exists a combination of the magnitude of local deformation and the length scale to maximize the resulting curvature in the experimental system where residual stress forms only in the in-plane direction or the out-of-plane direction. We also confirm that the anisotropy of local deformations leads to various modes of the out-of-plane deformation through imperfect buckling.

Research Products

• [Presentation] ミスフィットひずみによる環状シートの変形解析 (2018)
  • Author(s): 富田 峻啓, 森本 卓也, 芦田 文博
  • Organizer: 日本機械学会中国四国支部第56期総会・講演会
• [Presentation] ミスフィットひずみによるポリマーシートのモーフィング (2017)
  • Author(s): 森本 卓也, 富田 峻啓, 芦田 文博
  • Organizer: 第28回新構造・機能制御と傾斜機能材料シンポジウム <FGMs2017>
• [Presentation] Morphing of a circular sheet via differential strain (2017)
  • Author(s): T. Morimoto, T. Tomita, F. Ashida
  • Organizer: The 3rd International Workshop on Advanced Dynamics and Model Based Control of Structures and Machines, Ural Branch of Russian Academy of Sciences, Perm, Russia
• [Presentation] ソフトマテリアルのモーフィング (2017)
  • Author(s): 森本 卓也
  • Organizer: トライボロジー会議2017秋（高松）
• [Presentation] Morphing patterns of bilayer elastomers (2016)
  • Author(s): Morimoto T., Ashida F.
  • Organizer: The Fifth Asian Conference on Mechanics of Functional Materials and Structures
  • Place of Presentation: Shanghai University, P. R. China
  • Year and Date: 2016-10-14
  • Int'l Joint Research
• [Presentation] 残留膨潤によるコンポジットエラストマの変形応答 (2016)
  • Author(s): 田村 勇樹, 森本 卓也, 芦田 文博
  • Organizer: 日本機械学会 M&M2016 材料力学カンファレンス講演論文集
  • Place of Presentation: 神戸大学
  • Year and Date: 2016-10-08
• [Presentation] エラストマの積層化によるモーフィング (2016)
  • Author(s): 森本卓也
  • Organizer: 日本機械学会 計算力学部門講演会 (CMD2016)
  • Place of Presentation: 名古屋大学
  • Year and Date: 2016-09-22
• [Presentation] Shape transformations of elastomeric sheets due to residual stresses (2015)
  • Author(s): T. Morimoto, F. Ashida, Y. Hayashi
  • Organizer: 2nd International Workshop on Advanced Dynamics and Model Based Control of Structures and Machines
  • Place of Presentation: Vienna University of Technology, Vienna, Austria
  • Year and Date: 2015-09-20
• [Presentation] Numerical simulation of a neo-Hookean bilayer under biaxial loads (2015)
  • Author(s): T. Morimoto, F. Ashida
  • Organizer: International Workshop of Pattern Formulation in Soft Materials
  • Place of Presentation: The St. Regis Tianjin, Tianjin, P. R. China
  • Year and Date: 2015-06-01
• [Book] Swelling-Induced Bending of Hydrogel Bistrips, in: A.K. Belyaev, H. Irschick, M. Krommer (Eds.) Dynamics and Control of Advanced Structures and Machines (2017)
  • Author(s): T. Morimoto, F. Ashida, Y. Hayashi
  • Total Pages: 7
  • Publisher: Springer