Experimental and numerical mechanical characterization of additively manufactured Ti6Al4V lattice structures considering progressive damage

Drücker, Sven; Schulze, Martina; Ipsen, Hendrik; Bandegani, Laura; Hoch, Helge; Kluge, Maximilian; Fiedler, Bodo

doi:10.1016/j.ijmecsci.2020.105986

Cited by 28 publications

(9 citation statements)

References 45 publications

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“…More recently, the uniaxial strength of lattice structures and foams has been studied numerically, by modeling the lattice as a set of beams and applying proper criteria to account for failure 24 or by implementing damage models to account for local fracture in 3D solid elements models. [25][26][27] However, multiaxial strength of lattices exhibiting brittle behavior is a not fully addressed topic yet very important when designing with this kind of structures.…”

mentioning

confidence: 99%

Multiaxial static strength of a 3D printed metallic lattice structure exhibiting brittle behavior

Gavazzoni

Pisati

Beretta

et al. 2021

Fatigue Fract Eng Mat Struct

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This paper focuses on numerical the prediction of multiaxial static strength of lattice structures. We analyze a body-centered cubic cell printed with Selective Laser Melting in AlSi10Mg aluminum alloy. Parent material is experimentally characterized, and the Gurson-Tveergard-Needleman (GTN) damage model is calibrated to predict failure in numerical simulations. The GTN model is used to predict failure of the lattice structures exhibiting brittle localized fracture, and it is validated through static tests. The results of experimental tension/ compression monotonic tests on lattice samples are compared with the results of numerical simulations performed on as-built geometry reconstructed by Xray computed tomography, showing a good correlation. Combining the damage model with computational micromechanics, multiaxial loading conditions are simulated to investigate the effective multiaxial strength of the lattice material. Yielding and failure loci are found by fitting a batch of points obtained by some multiaxial loading simulations. A formulation based on the criterion proposed by Tsai and Wu (1971) for anisotropic materials provides a good description of yielding and failure behavior under multiaxial load. Results are discussed, with a specific focus on the effect of as-built defects on multiaxial strength, by comparing the resistance domains of as-manufactured and asdesigned lattices.

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mentioning

confidence: 99%

Multiaxial static strength of a 3D printed metallic lattice structure exhibiting brittle behavior

Gavazzoni

Pisati

Beretta

et al. 2021

Fatigue Fract Eng Mat Struct

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“…The authors acknowledged that the inclusion of a suitable damage model is required for numerical determination of failure strain. This issue was tackled in (Drücker et al, 2021) by including a progressive damage model in a homogenization scheme for cubic lattice material. However, the obtained numerical results from homogenization do not completely agree with the experiments.…”

Section: Introductionmentioning

confidence: 99%

Damage-induced failure analysis of additively manufactured lattice materials under uniaxial and multiaxial tension

Molavitabrizi

Bengtsson²,

Botero³

et al. 2022

International Journal of Solids and Structures

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“…Thus, the mechanical properties of cell structures can be potentially controllable since the unit cells can be tailored to meet particular requirements. Currently, there is extensive literature on the modeling and experimental characterization of this type of structure [ 26 , 27 , 28 , 29 , 30 , 31 , 32 ]. The benefits of 3D printing technologies have allowed researchers to study these types of periodical structures experimentally, both in two-dimensional panels and three-dimensional strut-based structures [ 33 , 34 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Orthotropic Behavior in an Auxetic Structure Based on a Novel Design Parameter of a Square Cell with Re-Entrant Struts

et al. 2022

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In this research, a three-dimensional auxetic configuration based on a known re-entrant cell is proposed. The 3D auxetic cell is configured from a new design parameter that produces an internal rotation angle to its re-entrant elements to study elastic properties in its three orthogonal directions. Through a topological analysis using Timoshenko beam theory, the bending of its re-entrant struts is modeled as a function of the new design parameter to manipulate Poisson’s ratio and Young’s modulus. Experimental samples were fabricated using a fused filament fabrication system using ABS and subsequently tested under quasi-static compression and bending tests. Additionally, an orthotropy factor is applied that allows for measuring the deviation between the mechanical properties of each structure. The experimental results validate the theoretical design and show that this new unit cell can transmit an orthotropic mechanical behavior to the macrostructure. In addition, the proposed structure can provide a different bending stiffness behavior in up to three working directions, which allows the application under different conditions of external forces, such as a prosthetic ankle.

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Experimental and numerical mechanical characterization of additively manufactured Ti6Al4V lattice structures considering progressive damage

Cited by 28 publications

References 45 publications

Multiaxial static strength of a 3D printed metallic lattice structure exhibiting brittle behavior

Multiaxial static strength of a 3D printed metallic lattice structure exhibiting brittle behavior

Damage-induced failure analysis of additively manufactured lattice materials under uniaxial and multiaxial tension

Evaluation of the Orthotropic Behavior in an Auxetic Structure Based on a Novel Design Parameter of a Square Cell with Re-Entrant Struts

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