High Strain Rate Response of Additively-Manufactured Plate-Lattices: Experiments and Modeling

Tancogne-Dejean, Thomas; Li, Xueyang; Diamantopoulou, Marianna; Roth, Christian C.; Mohr, Dirk

doi:10.1007/s40870-019-00219-6

Cited by 68 publications

(37 citation statements)

References 38 publications

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“…The reason of this behaviour is based on the fact that fracture dominates the response of the samples from the very beginning and therefore, the positive strain-rate sensitivity of the inelastic response of the base material (Ti6Al4V alloy) is unnoticed. A negligible strain-rate sensitive on Ti6Al4V plate-lattices was already reported in [12]. The quantitative data of the amount of energy absorbed (per volume) by each lattice under each loading condition, up to a strain equal to ε = 0.2, is presented in Table 3.…”

Section: Resultsmentioning

confidence: 67%

“…There is some similarity regarding the shape of the curves, especially in the first stage of the L-type structure, and the failure sequence during deformation; but there is an important deviation in the stress values that can be explained considering the different relative densities between the experimental and computational specimens (see Table 1.). Although it seems a feasible explanation, we cannot underestimate the need of using a more accurate failure model that takes into account the influence of the Lode angle parameter [12].…”

Section: Resultsmentioning

confidence: 92%

“…on the mechanical performance of these materials is an essential requirement to create and design new mechanic metamaterials with optimal properties for the new technological challenges. In this regard, many researchers have studied and linked the static mechanical properties of lattice materials with their geometry and porosity [6 -10], but much less work has been done in the high-strain rate loading regime [11,12]. Therefore, in the present work, the authors study the energy absorption and failure mode of two Ti6Al4V lattice structures under static and dynamic conditions to provide new understanding of the dynamic behaviour of these metamaterials and to rationalise the link between lattice-performance binomial under dynamic conditions.…”

Section: Introductionmentioning

confidence: 99%

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On the mechanical behaviour of additively manufactured metamaterials under dynamic conditions

et al. 2021

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High-energy absorption and light-weightiness are two critical properties for impact protection in the aerospace sector. In the past, the use of periodic honeycomb structures or random porous metallic foams were the preferred route to obtain a good specific-energy absorption performance. In recent years, the use of additive manufacturing has increased the design freedom creating a new generation of reticulated and porous materials: the metamaterials or lattice materials. The internal geometries of these lattice structures can be tuned for superior optimal properties, e.g., energyabsorption and density. However, the mechanics of these materials under impact need to be understood with the purpose of mechanical optimisation, and the computational models validated. In this work, we present the experimental compressive behaviour, at room temperature, of two Ti6Al4V lattice structures under static and dynamic conditions. The quasi-static tests were performed by using a universal testing machine while the dynamic tests were conducted at 480s-1 with a split-Hopkinson bar. In all cases, the deformation process was filmed to analyse the failure. Finally, finiteelement simulations were done, employing the Johnson-Cook model, to describe the response of the alloy. The simulations were able to reflect the failure characteristics of each metamaterial but were not able to describe the macroscopic response due to the differences between the experimental and computational volume fraction.

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Section: Resultsmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

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On the mechanical behaviour of additively manufactured metamaterials under dynamic conditions

et al. 2021

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“…Tailoring the architecture of cellular materialsincluding random foams as well as deterministic truss-, plate-, and shell-based latticeshas produced a wide variety of metamaterials (also referred to as architected materials) whose macroscale physical and mechanical properties can be controlled by a careful design at the microstructural level. Supported by optimization techniques [1][2][3][4][5][6][7] and advances in additive manufacturing 8 , truss-and plate-based mechanical metamaterials [9][10][11][12][13][14][15] have gained prominence as, e.g., lightweight cellular solids with engineered stiffness, strength, or energy absorption. Unfortunately, they also suffer from detrimental stress concentrations found at all intersections of structural members, which generally leads to low strength and poor recoverability [16][17][18] .…”

Section: Introductionmentioning

confidence: 99%

Inverse-designed spinodoid metamaterials

et al. 2020

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After a decade of periodic truss-, plate-, and shell-based architectures having dominated the design of metamaterials, we introduce the non-periodic class of spinodoid topologies. Inspired by natural self-assembly processes, spinodoid metamaterials are a close approximation of microstructures observed during spinodal phase separation. Their theoretical parametrization is so intriguingly simple that one can bypass costly phase-field simulations and obtain a rich and seamlessly tunable property space. Counter-intuitively, breaking with the periodicity of classical metamaterials is the enabling factor to the large property space and the ability to introduce seamless functional grading. We introduce an efficient and robust machine learning technique for the inverse design of (meta-)materials which, when applied to spinodoid topologies, enables us to generate uniform and functionally graded cellular mechanical metamaterials with tailored direction-dependent (anisotropic) stiffness and density. We specifically present biomimetic artificial bone architectures that not only reproduce the properties of trabecular bone accurately but also even geometrically resemble natural bone.

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“…With this given, the Triple Minimal Periodic Surfaces (TPMS) lattices are a promising stretching-dominated lightweight lattice for higher energy absorption, highlighted by the scientific community. The TPMS presents a self-structured shell architecture suitable for powder-bed fusion AM technique that can be up to two times stiffer than truss-based lattices [3][4]. The TPMS reduces the stress concentration exhibit a smoother crush behavior when compressed compared to truss-based lattices [5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Mechanical characterization and numerical modeling of TPMS lattice structures subjected to impact loading

et al. 2021

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The advent of Powder Bed Fusion (PBF) techniques allows the additive manufacturing of complex structures, as Triply Periodic Minimal Surfaces (TPMS) lattices, which exhibit promising characteristics for impact applications, such as lightweight and high-energy absorption. Thus, this work aims to develop a numerical model of TPMS structures to investigate the mechanical response of such structures when subjected to impact loadings. To fulfill this task, stainless steel samples made by PBF technique were mechanically characterized at different strain rates using a universal testing machine and Split Hopkinson Pressure Bar. The testing campaign also explored the compressive and tensile material response, with the strain field being monitored by Digital Image Correlation technique. It was noted that the material exhibits a similar elasto-plastic response on both tension and compression and an evident strain rate hardening when the material is loaded from static (0.001 s-1) to dynamic strain rates (4000 s-1). Constitutive parameters were then obtained and implemented in an explicit finite element model developed through Abaqus CAE. Samples of TMPS lattices were manufactured and tested at different loading velocities, which showed that the FE model developed can be used to predict the impact response of TMPS lattices.

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High Strain Rate Response of Additively-Manufactured Plate-Lattices: Experiments and Modeling

Cited by 68 publications

References 38 publications

On the mechanical behaviour of additively manufactured metamaterials under dynamic conditions

On the mechanical behaviour of additively manufactured metamaterials under dynamic conditions

Inverse-designed spinodoid metamaterials

Mechanical characterization and numerical modeling of TPMS lattice structures subjected to impact loading

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