Purpose

Many studies only take into account the ply stacking sequence as the design variable to determine the optimal ply drop-off location; however, it is necessary to optimize other parameters that have a direct influence on the ply drop-off site such as which plies should be dropped and in which longitudinal direction. That way, the purpose of this study is to find the most significant design variables relative to the drop-off location considering the transversal and longitudinal positions, seeking to achieve the optimal combination of ply drop-off locations that provides excellent performance for the laminate plate.

Design/methodology/approach

This study aims to determine the optimal drop-off location in a laminate plate using the finite element method and an approach statistical with design of experiments (DOE).

Findings

The optimization strategy using DOE revealed to be satisfactory for analyzing laminate structures with ply drop-offs, demonstrating that not all design factors influence the response variability. The failure criterion response variable revealed a poor fit, with an adjusted coefficient of determination lower than 60%, thus demonstrating that the response did not vary with the ply drop-off location. Already the strain and natural frequency response variables presented high significance. Finally, the optimization strategy revealed that the optimal drop-off location that minimizes the strain and maximizes the natural frequency is the ply drop-off located of the end plate.

Originality/value

It was also noted that many researchers prefer evolutionary algorithms for optimizing composite structures with ply drop-offs, being scarce to the literature studies involving optimization strategies using response surface methodology. In addition, many studies only take into account the ply stacking sequence as the design variable to determine the optimal ply drop-off location; however, in this study, the authors investigated other important parameters that have direct influence on the ply drop-off site such as which plies should be dropped and in which longitudinal direction.

中文翻译：

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使用响应面方法优化设计具有铺层脱落的复合结构

目的

许多研究仅将层板堆叠顺序作为设计变量来确定最佳层板下落位置；然而，有必要优化对层落点有直接影响的其他参数，例如应该放下哪些层以及在哪个纵向方向上。这样，本研究的目的是在考虑横向和纵向位置的情况下找到与落点位置相关的最重要的设计变量，寻求实现层落点位置的最佳组合，为层压板提供出色的性能.

设计/方法/方法

本研究旨在使用有限元方法和实验设计 (DOE) 统计方法来确定层压板中的最佳下降位置。

发现

使用 DOE 的优化策略表明，对于分析具有铺层脱落的层压结构是令人满意的，这表明并非所有设计因素都会影响响应可变性。失效准则响应变量显示拟合不佳，调整后的决定系数低于 60%，因此表明响应不随层脱落位置而变化。应变和固有频率响应变量已经具有很高的意义。最后，优化策略表明，使应变最小化和固有频率最大化的最佳下降位置是位于端板的帘布层下降。

原创性/价值

还指出，许多研究人员更喜欢使用进化算法来优化具有层数下降的复合结构，这在涉及使用响应面方法的优化策略的文献研究中很少见。此外，许多研究仅将层板堆叠顺序作为设计变量来确定最佳层板下落位置；然而，在这项研究中，作者研究了其他重要的参数，这些参数对铺层下落点有直接影响，例如哪些层应该下落以及在哪个纵向方向上。