Parametric design of graded truss lattice structures for enhanced thermal dissipation

Vaissier, Benjamin; Pernot, Jean-Philippe; Chougrani, Laurent; Véron, Philippe

doi:10.1016/j.cad.2019.05.022

Cited by 31 publications

(8 citation statements)

References 37 publications

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“…Recently, the SIMP and level set topology optimization approaches have been extended to graded material design problems. Example applications include compliant mechanism design [13], auxetic material design [14], thermal applications [15] and cellular structure design [16]. In this paper, we build on these heterogeneous material topology optimization approaches.…”

Section: Heterogeneous Materials Designmentioning

confidence: 99%

Sliding Basis Optimization for Heterogeneous Material Design

Ulu¹,

Korneev²,

Ulu³

et al. 2020

Preprint

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We present the sliding basis computational framework to automatically synthesize heterogeneous (graded or discrete) material fields for parts designed using constrained optimization. Our framework uses the fact that any spatially varying material field over a given domain may be parameterized as a weighted sum of the Laplacian eigenfunctions. We bound the parameterization of all material fields using a small set of weights to truncate the Laplacian eigenfunction expansion, which enables efficient design space exploration with the weights as a small set of design variables. We further improve computational efficiency by using the property that the Laplacian eigenfunctions form a spectrum and may be ordered from lower to higher frequencies. Starting the optimization with a small set of weighted lower frequency basis functions we iteratively include higher frequency bases by sliding a window over the space of ordered basis functions as the optimization progresses. This approach allows greater localized control of the material distribution as the sliding window moves through higher frequencies. The approach also reduces the number of optimization variables per iteration, thus the design optimization process speeds up independent of the domain resolution without sacrificing analysis quality. While our method is useful for problems where analytical gradients are available, it is most beneficial when the gradients may not be computed easily (i.e., optimization problems coupled with external black-box analysis) thereby enabling optimization of otherwise intractable design problems. The sliding basis framework is independent of any particular physics analysis, objective and constraints, providing a versatile and powerful design optimization tool for various applications. We demonstrate our approach on graded solid rocket fuel design and multi-material topology optimization applications and evaluate its performance.

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Section: Heterogeneous Materials Designmentioning

confidence: 99%

Sliding Basis Optimization for Heterogeneous Material Design

Ulu¹,

Korneev²,

Ulu³

et al. 2020

Preprint

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show abstract

“…Yang et al [19] reported that the average Nusselt number of sandwich panel filled with Kagome truss structure is 8% to 37% higher than that filled with tetrahedral truss structure. Vaissier et al [20] proposed a new optimization design method to improve the thermal dissipation capacity of graded truss structures, and the method was validated by several case studies. Hou et al [21] reported that the different arrangement directions of the Kagome-type truss structure in the channel can cause a maximum difference of 9.7% in heat transfer coefficient and 20% in friction coefficient.…”

Section: Introductionmentioning

confidence: 99%

Study on flow and heat transfer characteristics of cooling channel filled with x-shaped truss array

Gao

et al. 2023

THERM SCI

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In order to enhance the cooling performance of turbine blades, novel cooling channels filled with X-shaped truss array were investigated in this study. The flow mechanism and heat transfer characteristic of the cooling channel filled with X-shaped truss array were analyzed numerically. The empirical correlations of friction coefficient and Nusselt number related to the inlet Reynolds number (10,000 to 60,000) and truss rod inclination angle (30? to 45?) were fitted. The results show that the secondary flow vortex in the channel and the Nusselt number on the channel wall both show periodic distributions along the streamwise direction. The row-averaged Nusselt number and friction coefficient of the channel first decrease quickly and then decrease slowly along the streamwise direction. When truss rod inclination angle increases from 30? to 60?, the whole-averaged Nusselt number and the whole friction coefficient of the channel increase by 25.4% to 52.3% and 1.19 to 1.33 times respectively under different Reynolds number. The channel with truss rod inclination angle of 45? has the best comprehensive thermal performance. In all cases, the ratio of heat transfer quantity of the truss rod surface to the total heat transfer quantity of the channel ranges from 22.9% to 42.3%. The increase of Reynolds number improves the heat transfer quantity of the channel wall and the increase of truss rod inclination angle reduces the heat transfer quantity of the channel wall.

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“…Lightweight porous metals or metal foams have been focused on because of their excellent acoustic, 1) mechanical 2) and thermal 3) properties. Their unique cell structures sometimes cause negative modulus, 4) negative Poisson's ratio 5) and negative stiffness.…”

Section: Introductionmentioning

confidence: 99%

Cell Size Effects in Additively Manufactured Porous Titanium Consisting of Ordered Rhombic Dodecahedron Cells

Guo

Kitazono

2022

Mater. Trans.

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Lightweight porous metals have been focused on as structural and energy absorbing materials. Mechanical properties of classical porous metals fall under the specific specimen dimension. Such cell size effects are mainly caused by the disordered cells. The present study experimentally evaluates the cell size effects of additively manufactured porous metals consisting of ordered cells. Different sized porous titanium specimens consisting of ordered rhombic dodecahedron cells are manufactured through electron beam melting process. Mechanical properties are determined by quasi-static compression tests. The plateau stress and the energy absorption are almost independent of the specimen dimension divided by the cell diameter. Experimental results conclude that the cell size effects are suppressed in additively manufactured porous metals consisting of well-defined ordered cells.

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Parametric design of graded truss lattice structures for enhanced thermal dissipation

Cited by 31 publications

References 37 publications

Sliding Basis Optimization for Heterogeneous Material Design

Sliding Basis Optimization for Heterogeneous Material Design

Study on flow and heat transfer characteristics of cooling channel filled with x-shaped truss array

Cell Size Effects in Additively Manufactured Porous Titanium Consisting of Ordered Rhombic Dodecahedron Cells

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