Journal
APPLIED COMPOSITE MATERIALS
Volume 28, Issue 4, Pages 1039-1066Publisher
SPRINGER
DOI: 10.1007/s10443-021-09882-2
Keywords
Sandwich T-joint; Optimization; Progressive damage analysis; Multi-island genetic algorithm; User-defined suppression process
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This paper investigates the lightweight optimization of sandwich structure T-joints under side bending load, achieving a 30.75% weight reduction through methods such as self-adjusted parametric modeling and user-defined suppression process for optimizing the stacking sequence of variable-thickness composite laminates.
Sandwich structure T-joints are increasingly broadly applied in aviation and aerospace industries due to the need for lightweight design. This paper deals with the lightweight optimization of a typical adhesively bonded Nomex honeycomb-core sandwich T-joint in side bending load, considering the strength constraints. The optimization problem, with discrete and continuous design variables, is a compound optimization problem involving size optimization for the whole structure and stacking sequence optimization for multiple variable-thickness composite laminates. A self-adjusted parametric modeling with user-defined suppression process is proposed. An integrated combination of progressive damage model methodology, self-adjusted parametric modeling with user-defined suppression process and multi-island genetic algorithm is applied for the optimization problem. The optimization result showed 30.75% weight reduction compared to the original T-joint configuration. On the basis of history data, we investigate the correlations between design variables and concerned constraint variables.
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