An efficient method for shape and topology optimization of shell structures

Ho-Nguyen-Tan, Thuan; Kim, Hyun‐Gyu

doi:10.1007/s00158-022-03213-0

Cited by 18 publications

(3 citation statements)

References 65 publications

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“…( 23) is the reaction-diffusion equation and level set functions φ k have the upper and lower limits that impose to regularize optimization problem [45]. The finite element (FE) method is employed to solve the reactiondiffusion equation, and further details regarding the computational procedure and the update of the Lagrange multiplier for the volume constraint can be found in one of the authors' works [44,46]. During the topology optimization process, an Ersatz material model is utilized to represent the structural boundaries of the resin material and fiber reinforcement in CCF-reinforced composite structures, where the element density ρ k e is defined as…”

Section: Two-materials Topology Optimization For Ccf-reinforced Compo...mentioning

confidence: 99%

“…As described in section 2, in the two-material topology optimization process of CCF-reinforced composite structures, the structural boundaries of the resin material and fiber reinforcement are represented by the zero-contour of level set functions. To accurately represent the structural boundary of an optimal design, the cutting method, presented in two of the authors' works [42,[46][47][48][49][50], is used. In this method, the zero-contour of level set functions k,i .…”

Section: Generation Of Stl Modelsmentioning

confidence: 99%

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Coupling design and fabrication of continuous carbon fiber-reinforced composite structures using two-material topology optimization and additive manufacturing

Ho,

Nguyen,

et al. 2024

Int J Adv Manuf Technol

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This study presents an integration of the level set-based two-material topology optimization method and the additive manufacturing technique for the design and fabrication of continuous carbon fiber (CCF)-reinforced composite structures. Firstly, optimal configurations of the resin material and fiber reinforcement are obtained to maximize the structural stiffness under desired volume constraints using the two-material topological optimization. After that, the level set-based cutting mesh method and triangulation scheme are employed to interpret these 1 ManuscriptClick here to access/download;Manuscript;IJAMT.tex Click here to view linked References topological designs into stereolithography (STL) models with clear structural boundaries for the manufacturing. A customized pre-processing strategy is used to accurately determine the fiber placement regions from the optimal designs. Topological results are then fabricated using the CCF-based 3D printing method with prepreg carbon fibers. Subsequently, the performance of printed CCF-reinforced composite structures is investigated, using different resin materials: Esun polylactic acid (EPLA) and polyamide 12 with 10% carbon fiber (PA12 10CF).Experimental results indicate a significant increase in stiffness and strength of composite structures with fiber reinforcements for all resin materials, with an increase of 315% for EPLA and 234% for PA12 10CF. Additionally, the CCFreinforced composite structures made of PA12 10CF exhibit superior stiffness compared to those made of EPLA with a double increment. The microstructural characteristics of damaged regions are examined using scanning electron microscope (SEM) images, which provide valuable insights into the behavior of resin and fiber materials.

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Section: Two-materials Topology Optimization For Ccf-reinforced Compo...mentioning

confidence: 99%

Section: Generation Of Stl Modelsmentioning

confidence: 99%

Coupling design and fabrication of continuous carbon fiber-reinforced composite structures using two-material topology optimization and additive manufacturing

Ho,

Nguyen,

et al. 2024

Int J Adv Manuf Technol

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“…Commonly used stiffener configurations include orthogonal stiffeners (Lee and Kim, 1998;Van Dung and Chan, 2017), triangular stiffeners (Rahimi et al, 2013;Wang and Abdalla, 2015), Kagome stiffeners (Semmani et al, 2020) and oblique orthogonal stiffeners (Quan et al, 2019;Duc et al, 2020). To obtain innovative configurations of the stiffeners of the integrally stiffened shells, topology optimization gradually becomes an important and popular approach in recent years (Hassani et al, 2013;Shimoda et al, 2023;Ho-Nguyen-Tan and Kim, 2022) proposed an efficient method for shape and topology optimization of shell structures based on the level set method (Zhu et al, 2016). reviewed the recent advances of topology optimization techniques applied in aircraft and aerospace structures design, and various successful applications of aeronautic and astronautic engineering using topology optimization were introduced.…”

Section: Introductionmentioning

confidence: 99%

Structural lightweight design and experimental validation for aerospace sealed cabin

Zhizhong,

Hongqing,

Zengcong

et al. 2023

Front. Mech. Eng.

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Due to the high specific stiffness, high specific strength, good fatigue resistance and high structural reliability, the integrally stiffened shells are widely applied in the sealed cabins. In order to enhance the detection distance of the deep space and improve the payload detection capability, it is of great significance to carry out lightweight design for the integrally stiffened shells. However, it is challenging to perform optimization for the structures due to the strict loading conditions, complicated structures and short development cycles. In this work, a novel layout design framework for the integrally stiffened shells under complex loading conditions is proposed. The topology optimization method is employed to obtain an innovative layout design of the integrally stiffened shells firstly, and then the mesh-mapping technique is utilized to assist the reconstruction and modeling process of the optimization result. Compared with the traditional design of orthogonal stiffeners, the weight of the optimized configuration of the integrally stiffened shell reduces by 17.1%, demonstrating excellent lightweight design effects. Moreover, a sealed cabin is constructed based on the optimization and numerical analysis result by taking the manufacturing requirement into consideration. With the purpose of assessing the bearing ability of the welded seam and evaluating the airtight performance of the sealed cabin, experimental validations of the hydrostatic test and airtight test are carried out, and the experimental results validate the applicability and effectiveness of the proposed framework.

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Numerical Verification of the Positive Gaussian Curvature Shell Topological Optimization Approach

Lugchenko,

Reznik,

Petrova

et al. 2023

Lecture Notes in Networks and Systems

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An efficient method for shape and topology optimization of shell structures

Cited by 18 publications

References 65 publications

Coupling design and fabrication of continuous carbon fiber-reinforced composite structures using two-material topology optimization and additive manufacturing

Coupling design and fabrication of continuous carbon fiber-reinforced composite structures using two-material topology optimization and additive manufacturing

Structural lightweight design and experimental validation for aerospace sealed cabin

Numerical Verification of the Positive Gaussian Curvature Shell Topological Optimization Approach

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