Compression behaviors of 3D printed pyramidal lattice truss composite structures

Ye, Gaoyuan; Bi, Hongjie; Hu, Yingcheng

doi:10.1016/j.compstruct.2019.111706

Cited by 63 publications

(19 citation statements)

References 32 publications

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“…To describe the structural features, three structural parameters are used: strut length L , diameter D , and inclination angle ω between the strut and the horizontal plane ( Figure 1 a). For pyramidal lattice material, the effect of the strut length or inclination angle is realised by changing the relative density of the lattice samples [ 18 ]. While the inclination angle is constant, the mechanical properties are related to the aspect ratio L / D [ 19 ].…”

Section: Experimental Workmentioning

confidence: 99%

Compressive Behaviour of Aluminium Pyramidal Lattice Material-Filled Tubes

et al. 2021

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This study focuses on the uniaxial compressive behaviour of thin-walled Al alloy tubes filled with pyramidal lattice material. The mechanical properties of an empty tube, Al pyramidal lattice material, and pyramidal lattice material-filled tube were investigated. The results show that the pyramidal lattice material-filled tubes are stronger and provide greater energy absorption on account of the interaction between the pyramidal lattice material and the surrounding tube.

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Section: Experimental Workmentioning

confidence: 99%

Compressive Behaviour of Aluminium Pyramidal Lattice Material-Filled Tubes

et al. 2021

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“…The work showed an increasing uneven stress distribution for high-density values usually not accounted for in analytical formulations. Some works, such as that of Ye et al, investigated the compression properties of pyramidal 3D printed trusses, using an experimental approach and FEA, finding a good fit between both data. Maskery et al produced polymeric TPMS lattices using AM.…”

Section: Introductionmentioning

confidence: 99%

“…Infills and sandwich cores have remarkable compressive properties, particularly out-of-plane compressive strength. Ye et al 27 observed three post-failure mechanisms, including strain-hardening, stable deforming, and softening, depending on the slenderness of the strut. Moreover, Leonardi et al 22 evaluated bending stresses in heterogeneous lattices showing the possibility to tune an AM lattice spatially, that is, define density or geometrical shape as a position function.…”

Section: Introductionmentioning

confidence: 99%

Effect of Relative Density in In-Plane Mechanical Properties of Common 3D-Printed Polylactic Acid Lattice Structures

2021

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Lattice structures are employed as lightweight sandwich cores, supports, or infill patterns of additive manufacturing (AM) components. As infill structures, the mechanical properties of AM parts are influenced by the infill pattern. In this work, we present the mechanical characterization of three commonly used infill patterns in AM, triangular, square, and hexagonal, and compare them with analytical and numerical models. Fused filament fabrication of polylactic acid (PLA) thermoplastic is used as the printing material for the compressive and tensile tests. First, a parametric analysis is performed by changing the infill density to obtain numerically and analytically the mechanical properties of the studied samples. Next, we compare the experimental results with numerical and analytical models and propose numerical correlations for high-density honeycombs. The stiffest infill pattern was the square, and the explanation is provided in detail. Also, there is a nonlinear correlation between density and the mechanical properties; however, the strongest part was not possible to determine with a significant statistical value. Finally, we propose simplified models for predicting the compressive and tensile response of AM PLA structures by considering the infill regions as homogenized structures.

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“…Innovative advanced materials and intervention techniques such as fiber-reinforced polymers (FRPs) in the form of sheets [4][5][6][7][8][9][10][11][12], strips [13][14][15][16], composite ropes [4,17] or composite shells [18,19], among others, are widely used in deficient or damaged RC structures. Suitable retrofit of deficient members can improve their strength, delay further corrosion of the reinforcement and reduce deformations in the serviceability limit state [1,[13][14][15][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Advanced Composite Retrofit of RC Columns and Frames with Prior Damages—Pseudodynamic Finite Element Analyses and Design Approaches

Rousakis

Anagnostou

Fanaradelli

2021

Fibers

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This study develops three-dimensional (3D) finite element (FE) models of composite retrofits in deficient reinforced concrete (RC) columns and frames. The aim is to investigate critical cases of RC columns with inadequate lap splices of bars or corroded steel reinforcements and the beneficial effects of external FRP jacketing to avoid their premature failure and structural collapse. Similarly, the RC-frame FE models explore the effects of an innovative intervention that includes an orthoblock brick infill wall and an advanced seismic joint made of highly deformable polymer at the boundary interface with the RC frame. The experimental validation of the technique in RC frames is presented in earlier published papers by the authors (as well as for a four-column structure), revealing the potential to extend the contribution of the infills at high displacement ductility levels of the frames, while exhibiting limited infill damages. The analytical results of the advanced FE models of RC columns and frames compare well with the available experimental results. Therefore, this study’s research extends to critical cases of FE models of RC frames with inadequate lap splices or corroded steel reinforcements, without or with brick wall infills with seismic joints. The advanced pseudodynamic analyses reveal that for different reinforcement detailing of RC columns, the effects of inadequate lap-spliced bars may be more detrimental in isolated RC columns than in RC frames. It seems that in RC frames, additional critical regions without lap splices are engaged and redistribution of damage is observed. The detrimental effects of corroded steel bars are somewhat greater in bare RC frames than in isolated RC columns, as all reinforcements in the frame are considered corroded. Further, all critical cases of RC frames with prior damages at risk of collapse may receive the innovative composite retrofit and achieve higher base shear load than the original RC frame without corroded or lap-spliced bars, at comparable top displacement ductility. Finally, the FE analyses are utilized to propose modified design equations for the shear strength and chord rotation in cases of failure of columns with deficiencies or prior damages in RC structures.

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Compression behaviors of 3D printed pyramidal lattice truss composite structures

Cited by 63 publications

References 32 publications

Compressive Behaviour of Aluminium Pyramidal Lattice Material-Filled Tubes

Compressive Behaviour of Aluminium Pyramidal Lattice Material-Filled Tubes

Effect of Relative Density in In-Plane Mechanical Properties of Common 3D-Printed Polylactic Acid Lattice Structures

Advanced Composite Retrofit of RC Columns and Frames with Prior Damages—Pseudodynamic Finite Element Analyses and Design Approaches

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