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IGA Based Bi-Layer fiber angle optimization Method for Variable Stiffness Composites

Computer Modeling in Engineering & Sciences 2020年第7期124卷 179-202页

作者： Chao Mei Qifu Wang Chen Yu Zhaohui Xia School of Mechanical Science and Engineering Huazhong University of Science and TechnologyWuhan430074China

This paper presents a topology optimization method for variable stiffness composite panels with varying fiber orientation and curvilinear fiber path.Non-uniform rational B-Splines(NURBS)based Isogeometric analysis(IGA)is utilized for the numerical computation of the general minimum compliance problem.The sensitivity analysis of the structure compliance function for the density and bi-layer orientation is conducted.The bi-layer fiber paths in the design domain are generated using streamline method and updated by divided pieces reselection method after the optimization process.Several common examples are tested to demonstrate the effectiveness of the method.The results show that the proposed method can generate more manufacturable fiber paths than some typical topology optimization methods.

关键词： Isogeometric analysis fiber angle optimization variable stiffness

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Bilateral Filter for the optimization of Composite Structures

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Computer Modeling in Engineering & Sciences 2021年第6期127卷 1087-1099页

作者： Yuhang Huo Ye Tian Shiming Pu Tielin Shi Qi Xia State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhanChina State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalianChina

In the present study,we propose to integrate the bilateral filter into the Shepard-interpolation-based method for the optimization of composite structures.The bilateral filter is used to avoid defects in the structure that may arise due to the gap/overlap of adjacent fiber tows or excessive curvature of fiber tows.According to the bilateral filter,sensitivities at design points in the filter area are smoothed by both domain filtering and range filtering.Then,the filtered sensitivities are used to update the design variables.Through several numerical examples,the effectiveness of the method was verified.

关键词： Design optimization composite structure fiber angle optimization bilateral filtering Shepard interpolation manufacturability constraints

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An XBi-CFAO Method for the optimization of Multi-Layered Variable Stiffness Composites Using Isogeometric Analysis

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Computer Modeling in Engineering & Sciences 2021年第11期129卷 627-659页

作者： Chao Mei Qifu Wang Chen Yu Zhaohui Xia School of Mechanical Science and Engineering Huazhong University of Science&TechnologyWuhan430074China School of Mechanical Engineering Yangtze UniversityJingzhou434023China

This paper presents an effective fiber angle optimization method for two and multi-layered variable stiffness composites.A gradient-based fiber angle optimization method is developed based on isogeometric analysis(IGA).Firstly,the element densities and fiber angles for two and multi-layered composites are synchronously optimized using an extended Bi-layered continuous fiber angle optimization method(XBi-CFAO).The densities and fiber angles in the base layer are attached to the control points.The structure response and sensitivity analysis are accomplished using the non-uniform rational B-spline(NURBS)based IGA.By the benefit of the B-spline space,this method is free from checkerboards,and no additional filtering is needed to smooth the sensitivity numbers.Then the curved fiber paths are generated using the streamline method and the discontinuous fiber paths are smoothed using a partitioned selection process.The proposed method in the paper can alleviate the phenomenon of fiber discontinuity,enhance information retention for the optimized fiber angles of the singular points and save calculating resources effectively.

关键词： Isogeometric analysis fiber angle optimization variable stiffness laminates fiber path optimization topology optimization

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