Analysis of swelling-induced pattern transformation of porous gel films

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K13829
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Materials/Mechanics of materials
• Research Institution: Osaka University (2016); Nagoya University (2015)
• Principal Investigator: Okumura Dai 大阪大学, 工学研究科, 准教授 (70362283)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 機械材料・材料力学 / マイクロ・ナノデバイス / 自己組織化 / 構造・機能材料 / 高分子構造・物性

Outline of Final Research Achievements

In this study, finite element analysis of swelling-induced pattern transformation in porous gel films is analyzed. An inhomogeneous field theory for polymeric gels is implemented as a user-defined material subroutine into the finite element package Abaqus. Swelling process is analyzed by increasing the chemical potential of external solvent. To investigate the point of buckling and the buckling mode, eigenvalue buckling prediction is conducted using a quasi incremental loading pattern. This approach is verified by changing the base state. It is found that the second buckling point appears for causing transformation into S shaped patterns, when the pitch-to-diameter ratio is small, while no pattern transformation occurs when the pitch-to-diameter ratio is large.

Free Research Field

固体力学