2D Elasticity solution for sandwich panels with functionally graded lattice cores

Georges, Hussam; Meyer, Guillaume; Mittelstedt, Christian; Becker, Wilfried

doi:10.1016/j.compstruct.2022.116045

Cited by 15 publications

(3 citation statements)

References 39 publications

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“…Such discontinuities caused by discrete step-wise grading have been recognized [29][30][31], and dealing with them in the design stage has been an active area of research. Researchers have attempted to use numerical modeling and machine learning in previous studies to estimate the loss of strength and to smooth the transition [32,33]. However, these studies are only concerned with two-dimensional truss-based lattices.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of the Effects of Discrete-Grading-Induced Discontinuities on the Material Properties of Functionally Graded Ti-6Al-4V Lattices

Ye,

Babazadeh-Naseri,

Higgs III

et al. 2024

Materials

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In this study, we compared the material properties of linearly and sharply graded Ti6Al4V additively manufactured samples to investigate whether the more severe discontinuities caused by sharp grading can reduce performance. We performed compression testing with digital image correlation (DIC) in two loading directions for each grading design to simulate iso-stress and iso-strain conditions. We extracted the elastic stiffness, yield strength, yield strain, and energy absorption capacity of each sample. In addition, we used micro-computed tomography (micro-CT) imaging to examine the printing quality and dimensional accuracy. We found that sharply graded struts have a 12.95% increase in strut cross-sectional areas, whereas linearly graded struts produced an average of 49.24% increase compared to design. However, sharply graded and linearly graded FGL samples do not have statistically significant differences in elastic stiffness and yield strength. For the iso-strain condition, the average DIC-corrected stiffnesses for linearly and sharply graded samples were 6.15 GPa and 5.43 GPa, respectively (p = 0.4466), and the yield stresses were 290.4 MPa and 291.2 MPa, respectively (p = 0.5734). Furthermore, we confirmed different types of printing defects using micro-CT, including defective pores and disconnected struts. These results suggest that the loss of material properties caused by manufacturing defects outweighs the adverse effects of discrete-grading-induced discontinuities.

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Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of the Effects of Discrete-Grading-Induced Discontinuities on the Material Properties of Functionally Graded Ti-6Al-4V Lattices

Ye,

Babazadeh-Naseri,

Higgs III

et al. 2024

Materials

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“…Consequently, it significantly enhances the material's ability to withstand pressure and carry heavy loads, thereby improving its overall loadcarrying capacity. [29][30][31][32] Drawing on the advantages of this structure, Choy et al 33 investigated the compressive properties of functionally graded lattice structures processed by 3D printing. Nian et al 34 utilized experimental and numerical methods to investigate the bending behavior of functionally graded lattice metamaterial beams produced by 3D printing.…”

Section: Introductionmentioning

confidence: 99%

“…As a result, this unique structural design effectively cushions pressure, absorbs impact forces and evenly distributes them throughout the material. Consequently, it significantly enhances the material's ability to withstand pressure and carry heavy loads, thereby improving its overall load‐carrying capacity 29–32 . Drawing on the advantages of this structure, Choy et al 33 investigated the compressive properties of functionally graded lattice structures processed by 3D printing.…”

Section: Introductionmentioning

confidence: 99%

An experimental and numerical investigation into compressive failure of pyramidal lattice sandwich structures fabricated using stereolithography technology

Zhai,

Wang,

et al. 2024

Fatigue Fract Eng Mat Struct

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The pyramid lattice sandwich structure, characterized by high load‐bearing capacity, lightweight nature, and fully open internal space, is considered an extremely promising super‐strong structure. Stereolithography technology was utilized to achieve the monolithic formation of single‐layer multi‐cell pyramidal lattice sandwich structures. Quasi‐static compression tests and finite element simulations were conducted to characterize the compressive properties and failure modes. Results indicate that the compressive strength, compressive modulus, specific strength, and specific stiffness of the single‐layer multi‐cell pyramidal lattice sandwich structure increase as the relative density increases. Moreover, fracture failure was observed in the structures with various relative densities. Additionally, the compressive failure of multi‐layer density gradient pyramidal lattice sandwich structures was investigated. Experimental and numerical findings indicate that the optimal density gradient scheme for the ZCMLG structure is I‐III‐II, resulting in a peak compression force that is 342.14% and 288.55% higher than that of the ZAMLG and ZBMLG structures, respectively.

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Design of Additively Manufactured 3D Lattice Cores of Sandwich Panels

Georges,

Mittelstedt,

Becker

2023

Springer Tracts in Additive Manufacturing

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2D Elasticity solution for sandwich panels with functionally graded lattice cores

Cited by 15 publications

References 39 publications

Experimental Evaluation of the Effects of Discrete-Grading-Induced Discontinuities on the Material Properties of Functionally Graded Ti-6Al-4V Lattices

Experimental Evaluation of the Effects of Discrete-Grading-Induced Discontinuities on the Material Properties of Functionally Graded Ti-6Al-4V Lattices

An experimental and numerical investigation into compressive failure of pyramidal lattice sandwich structures fabricated using stereolithography technology

Design of Additively Manufactured 3D Lattice Cores of Sandwich Panels

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