Damage characterizations and simulation of selective laser melting fabricated 3D re-entrant lattices based on in-situ CT testing and geometric reconstruction

Geng, Luchao; Wu, Wenwang; Sun, Limin; Fang, Daining

doi:10.1016/j.ijmecsci.2019.04.054

Cited by 70 publications

(13 citation statements)

References 40 publications

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“…The developed meta-structures exhibited superior Young's modulus, collapse strength and energy absorption than traditional honeycomb structures. Geng et al [25] investigated mechanical response, damage initiation and failure evolution of metallic meta-materials fabricated by SLM 3D printing under quasi-static compression. The results showed that the failure behavior of the reentrant lattice is governed not only by its topology, but also by the geometric defects and surface defects.…”

Section: Introductionmentioning

confidence: 99%

Reversible energy absorbing meta-sandwiches by FDM 4D printing

Bodaghi

Serjouei

Zolfagharian

et al. 2020

International Journal of Mechanical Sciences

188

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The aim of this paper is to introduce dual-material auxetic meta-sandwiches by four-dimensional (4D) printing technology for reversible energy absorption applications. The meta-sandwiches are developed based on an understanding of hyper-elastic feature of soft polymers and elasto-plastic behaviors of shape memory polymers and cold programming derived from theory and experiments. Dual-material lattice-based meta-structures with different combinations of soft and hard components are fabricated by 4D printing fused deposition modelling technology. The feasibility and performance of reversible dual-material meta-structures are assessed experimentally and numerically. Computational models for the meta-structures are developed and verified by the experiments. Research trials show that the dual-material auxetic designs are capable of generating a range of non-linear stiffness as per the requirement of energy absorbing applications. It is found that the meta-structures with hyper-elastic and/or elasto-plastic features dissipate energy and exhibit mechanical hysteresis characterized by non-coincident compressive loading-unloading curves. Mechanical hysteresis can be achieved by leveraging elasto-plasticity and snap-through-like mechanical instability through compression. Experiments also reveal that the mechanically induced plastic deformation and dissipation processes are fully reversible by simply heating. The material-structural model, concepts and results provided in this paper are expected to be instrumental towards 4D printing tunable meta-sandwiches for reversible energy absorption applications.

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Section: Introductionmentioning

confidence: 99%

Reversible energy absorbing meta-sandwiches by FDM 4D printing

Bodaghi

Serjouei

Zolfagharian

et al. 2020

International Journal of Mechanical Sciences

188

View full text Add to dashboard Cite

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“…Lattice structures are formed mathematically or geometrically by spatial arrangement and combination of a grouping of unit cells. Most researchers focus on the mechanical properties, such as compression and tension behavior [1][2][3][4][5][6][7][8], fracture behavior [9,10], fatigue behavior [11,12], and shear response [13], and biocompatibility [14][15][16] of these cells. Research has also been dedicated to design methods of lattice structures, including creating functionally graded porous structures [4,[17][18][19], panel or sandwich-shaped lattice structures [20][21][22], and the mathematically designing algorithm [23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Compressive and Tensile Behavior of Stainless Steel/Dissolvable Aluminum Bimetallic Composites by Finite Element Modeling and Digital Image Correlation

Ghasri-Khouzani

Bogno

et al. 2021

Materials

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This study reports fabrication, mechanical characterization, and finite element modeling of a novel lattice structure based bimetallic composite comprising 316L stainless steel and a functional dissolvable aluminum alloy. A net-shaped 316L stainless steel lattice structure composed of diamond unit cells was fabricated by selective laser melting (SLM). The cavities in the lattice structure were then filled through vacuum-assisted melt infiltration to form the bimetallic composite. The bulk aluminum sample was also cast using the same casting parameters for comparison. The compressive and tensile behavior of 316L stainless steel lattice, bulk dissolvable aluminum, and 316L stainless steel/dissolvable aluminum bimetallic composite is studied. Comparison between experimental, finite element analysis (FEA), and digital image correlation (DIC) results are also investigated in this study. There is no notable difference in the tensile behavior of the lattice and bimetallic composite because of the weak bonding in the interface between the two constituents of the bimetallic composite, limiting load transfer from the 316L stainless steel lattice to the dissolvable aluminum matrix. However, the aluminum matrix is vital in the compressive behavior of the bimetallic composite. The dissolvable aluminum showed higher Young’s modulus, yield stress, and ultimate stress than the lattice and composite in both tension and compression tests, but much less elongation. Moreover, FEA and DIC have been demonstrated to be effective and efficient methods to simulate, analyze, and verify the experimental results through juxtaposing curves on the plots and comparing strains of critical points by checking contour plots.

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“…The process aids in an excellent bonding between the particles, resulting in enhanced properties. The discrepancies concerning the properties obtained through theoretical and experimental approximations for SLM-manufactured structures can be minimized by adopting an FE based optimization route [95]. However, gradient auxetic structures made from SS316L powders using SLM have shown some inconsistencies concerning the porosity and the presence of unmelted grains [96].…”

Section: Slm and Dmlsmentioning

confidence: 99%

On the application of additive manufacturing methods for auxetic structures: a review

2021

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Auxetic structures are a special class of structural components that exhibit a negative Poisson's ratio (NPR) because of their constituent materials, internal microstructure, or structural geometry. To realize such structures, specialized manufacturing processes are required to achieve a dimensional accuracy, reduction of material wastage, and a quicker fabrication. Hence, additive manufacturing (AM) techniques play a pivotal role in this context. AM is a layer-wise manufacturing process and builds the structure as per the designed geometry with appreciable precision and accuracy. Hence, it is extremely beneficial to fabricate auxetic structures using AM, which is otherwise a tedious and expensive task. In this study, a detailed discussion of the various AM techniques used in the fabrication of auxetic structures is presented. The advancements and advantages put forward by the AM domain have offered a plethora of opportunities for the fabrication and development of unconventional structures. Therefore, the authors have attempted to provide a meaningful encapsulation and a detailed discussion of the most recent of such advancements pertaining to auxetic structures. The article opens with a brief history of the growth of auxetic materials and later auxetic structures. Subsequently, discussions centering on the different AM techniques employed for the realization of auxetic structures are conducted. The basic principle, advantages, and disadvantages of these processes are discussed to provide an in-depth understanding of the current level of research. Furthermore, the performance of some of the prominent auxetic structures realized through these methods is discussed to compare their benefits and shortcomings. In addition, the influences of geometric and process parameters on such structures are evaluated through a comprehensive review to assess their feasibility for the latermentioned applications. Finally, valuable insights into the applications, limitations, and prospects of AM for auxetic structures are provided to enable the readers to gauge the vitality of such manufacturing as a production method.

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Damage characterizations and simulation of selective laser melting fabricated 3D re-entrant lattices based on in-situ CT testing and geometric reconstruction

Cited by 70 publications

References 40 publications

Reversible energy absorbing meta-sandwiches by FDM 4D printing

Reversible energy absorbing meta-sandwiches by FDM 4D printing

Investigation of Compressive and Tensile Behavior of Stainless Steel/Dissolvable Aluminum Bimetallic Composites by Finite Element Modeling and Digital Image Correlation

On the application of additive manufacturing methods for auxetic structures: a review

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