Development of new functional bi-stable composite shells

2016 Fiscal Year Final Research Report

• Project/Area Number: 26289052
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Dynamics/Control
• Research Institution: Hokkaido University
• Principal Investigator: Honda Shinya 北海道大学, 工学(系)研究科(研究院), 准教授 (90548190)
• Research Collaborator: NARITA Yoshihiro 北海道大学, 大学院工学研究院, 名誉教授
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 積層複合材 / 形状双安定性 / シェル形状 / 多目的最適化

Outline of Final Research Achievements

During fabrication process of laminated fibrous composites, asymmetric laminates result in skewed surfaces after curing due to strong anisotropy of each layer, and composites with specific lay-ups and dimensions show bi-stable states. The present study performs a multi-objective optimization for the composite shell with bi-stable shapes. Objective functions are amount of averaged deformation between two stable shapes of shell and critical temperature of surroundings which is the maximum temperature to keep the bi-stable characteristics. These properties indicate a trade-off relation each other and are maximized simultaneously by using an effective multi-objective genetic algorithm method. Shell shapes after curing are predicted by the thermal deformation analysis based on the Rayleigh-Ritz method. Calculated results agree well with those from experiments with respect to shell shapes, and the present multi-objective optimization reveals wide-ranging Pareto optimum solutions.

Free Research Field

機械力学，複合材料工学，最適設計