A FEM study on mechanical behavior of cellular lattice materials based on combined elements

Geng, Xueyu; Ma, Liyang; Liu, Chao; Chen, Zhao; Yue, Zhufeng

doi:10.1016/j.msea.2017.11.082

Cited by 49 publications

(24 citation statements)

References 19 publications

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“…Using the displacement fields measured inside a 5 mm central gage length of one of the plain specimens (DIC-ARAMIS), the stress-strain diagram was built (Figure 8b), and the Young's modulus E, the yield stress σy, the ultimate tensile strength σUTS, and the elongation at break εmax were calculated and are shown in Table 2. These results are comparable to those obtained with the same alloy subjected to a similar heat treatment by Geng et al [38]: the differences in the E and σUTS values are less than 4%, while that in the σy values, less than 20%. The red curve in Figure 8b corresponds to the stress-strain diagram fitted with an exponential expression (Hollomon fitting).…”

Section: Fully Dense Specimens Plain Specimenssupporting

confidence: 90%

The Static and Fatigue Behavior of AlSiMg Alloy Plain, Notched, and Diamond Lattice Specimens Fabricated by Laser Powder Bed Fusion

Soul

Terriault

Braïlovski

2018

JMMP

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Abstract:The fabrication of engineered lattice structures has recently gained momentum due to the development of novel additive manufacturing techniques. Interest in lattice structures resides not only in the possibility of obtaining efficient lightweight materials, but also in the functionality of pre-designed architectured structures for specific applications, such as biomimetic implants, chemical catalyzers, and heat transfer devices. The mechanical behaviour of lattice structures depends not only the composition of the base material, but also on the type and size of the unit cells, as well as on the material microstructure resulting from a specific fabrication procedure. The present work focuses on the static and fatigue behavior of diamond cell lattice structures fabricated from an AlSiMg alloy by laser powder bed fusion technology. In particular, the specimens were fabricated with three different orientations of lattice cells-[001], [011], [111]-and subjected to static tensile testing and force-controlled pull-pull fatigue testing up to 1 × 10 7 cycles. In parallel, the mechanical behavior of fully dense plain and notched tensile specimens was also studied and compared to that of their lattice counterparts. Results showed a significant effect of the cell orientation on the fatigue lives: specimens oriented at [001] were~30% more fatigue-resistant than specimens oriented at [011] and [111].

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Section: Fully Dense Specimens Plain Specimenssupporting

confidence: 90%

The Static and Fatigue Behavior of AlSiMg Alloy Plain, Notched, and Diamond Lattice Specimens Fabricated by Laser Powder Bed Fusion

Soul

Terriault

Braïlovski

2018

JMMP

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“…Consequently, these models allow for a direct comparison with experiments. 37,38,57,64,65,67 Furthermore, finite-sized archimat models allow considering structural irregularities in a statistical manner. Typical irregularities are a misalignment of struts and vertices, 42,43,47,48,55,66,68,69 radius variations within individual struts, 55,67 porosity of the parent material 67 and missing struts or missing clusters of struts.…”

Section: Discrete Modellingmentioning

confidence: 99%

Buckling and postbuckling of architectured materials: A review of methods for lattice structures and metal foams

Völlmecke¹,

Todt

Yiatros

2021

Composites and Advanced Materials

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Recent advances in manufacturing and material science have given rise to numerous architectured materials (archimats), which are tailored for multifunctionality and improved performance. Specifically, lattice structures and metal foams are usually lightweight optimized structural morphologies, which are prone to non-linear instability phenomena, leading to collapse or to a different stable state. This article offers an extensive review of analytical, numerical and experimental methods for investigating buckling and postbuckling in such materials. In terms of analytical modelling, linear elastic and geometrically non-linear models are presented. In numerical analysis, discrete and continuum models are presented, highlighting how numerical modelling can inform design of such materials and finally, experimental methods across different scales are reported, highlighting their merits, depending on the aim of the investigation.

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“…To indicate the influence of the joint on the stiffness of the lattice, strut, beam, and solid element models were generated. A similar approach was invented by Geng et al [ 30 ] who used finite element models based on combined elements. Some of the Timoshenko beam elements in a unit cell in the middle of the loaded lattice structure were replaced with solid tetrahedral elements C3D10.…”

Section: Introductionmentioning

confidence: 99%

Computational Approaches of Quasi-Static Compression Loading of SS316L Lattice Structures Made by Selective Laser Melting

et al. 2021

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Additive manufacturing methods (AM) allow the production of complex-shaped lattice structures from a wide range of materials with enhanced mechanical properties, e.g., high strength to relative density ratio. These structures can be modified for various applications considering a transfer of a specific load or to absorb a precise amount of energy with the required deformation pattern. However, the structure design requires knowledge of the relationship between nonlinear material properties and lattice structure geometrical imperfections affected by manufacturing process parameters. A detailed analytical and numerical computational investigation must be done to better understand the behavior of lattice structures under mechanical loading. Different computational methods lead to different levels of result accuracy and reveal various deformational features. Therefore, this study focuses on a comparison of computational approaches using a quasi-static compression experiment of body-centered cubic (BCC) lattice structure manufactured of stainless steel 316L by selective laser melting technology. Models of geometry in numerical simulations are supplemented with geometrical imperfections that occur on the lattice structure’s surface during the manufacturing process. They are related to the change of lattice struts cross-section size and actual shape. Results of the models supplemented with geometrical imperfections improved the accuracy of the calculations compared to the nominal geometry.

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A FEM study on mechanical behavior of cellular lattice materials based on combined elements

Cited by 49 publications

References 19 publications

The Static and Fatigue Behavior of AlSiMg Alloy Plain, Notched, and Diamond Lattice Specimens Fabricated by Laser Powder Bed Fusion

The Static and Fatigue Behavior of AlSiMg Alloy Plain, Notched, and Diamond Lattice Specimens Fabricated by Laser Powder Bed Fusion

Buckling and postbuckling of architectured materials: A review of methods for lattice structures and metal foams

Computational Approaches of Quasi-Static Compression Loading of SS316L Lattice Structures Made by Selective Laser Melting

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