The effect of manufacturing defects on compressive strength of ultralight hollow microlattices: A data-driven study

Salari-Sharif, Ladan; Godfrey, Scott William; Tootkaboni, Mazdak; Valdevit, Lorenzo

doi:10.1016/j.addma.2017.11.003

Cited by 18 publications

(7 citation statements)

References 26 publications

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“…The hollow nodes of these lattices were shown to deform through bending (regardless of the coordination number); this phenomenon, coupled with stress concentration at the nodes, causes a knock-down from classical scaling laws, which do not account for nodal topology (Bauer et al, 2016;Bauer et al, 2017;Meza et al, 2014;Portela et al, 2018;Torrents et al, 2012;Valdevit et al, 2013). Local node buckling (at low relative densities) and high sensitivity to imperfection (waviness of the strut and non-ideal strut cross section) during fabrication of these structures also contribute to the reduction of strength (Salari-Sharif et al, 2018;Valdevit et al, 2013) . Adding fillets to the nodes efficiently reduces these stress concentrations, enhancing the strength of hollow-strut lattices.…”

Section: Introductionmentioning

confidence: 99%

The mechanical response of cellular materials with spinodal topologies

Hsieh¹,

Endo²,

Zhang

et al. 2019

Journal of the Mechanics and Physics of Solids

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Section: Introductionmentioning

confidence: 99%

The mechanical response of cellular materials with spinodal topologies

Hsieh¹,

Endo²,

Zhang

et al. 2019

Journal of the Mechanics and Physics of Solids

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“…Prashanth et al [13] evaluated the influence of different processing parameters on the room temperature tensile properties; they found that the room temperature tensile properties can be tuned insitu during the selective laser melting process giving an opportunity to define the mechanical properties of the SLM parts to suit their service requirements. Salari-Sharif et al [14] used a variety of measuring techniques (SEM imaging, CT scanning, and so on) to characterize the geometric imperfections in a nickel-based ultralight hollow microlattice and investigated their effects on the compressive strength of the lattice. Unfortunately, because of the high cooling rate and thermal inhomogeneity in the process of the SLM, there is a large temperature gradient between the sample and the substrate.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Performance and Residual Stress Generation of AlSi10Mg Processed by Selective Laser Melting

Wang

Jiang

Zhu

et al. 2018

Advances in Materials Science and Engineering

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During the selective laser melting (SLM) process, the scanned layers are subjected to rapid thermal cycles. By working on the mechanical properties, residual stress, and microstructure, the high-temperature gradients can have significant effect on the proper functioning and the structural integrity of built parts. This work presents a comprehensive study on the scanning path type and preheating temperature for AlSi10Mg alloy during SLM. According to the results, SLM AlSi10Mg parts fabricated in chessboard scanning strategy have higher mechanical properties or at least comparable to the parts fabricated in uniformity scanning strategy. In the SLM processing, the residual stress in different parts of the specimen varies with temperature gradient, and the residual stress at the edge of the specimen is obviously larger than that at the center. Under the chessboard scanning and preheating temperature 160°C, the residual stress in each direction of the specimens reaches the minimum. Under different forming processes, the morphology of the microstructure is obviously different. With the increase of preheating temperature, the molten pool in the side surface is obviously elongated and highly unevenly distributed. From the coupling relationship between the residual stress and microstructure, it can be found that the microstructure of top surface is affected by residual stresses σx and σy. But the side surface is mainly governed by residual stress σy; moreover, the greater the residual stress, the more obvious the grain tilt. In the XY and XZ surfaces, the scanning strategy has little influence on the tilt angle of the grain. But, the tilt angle and morphology of the microstructure are obviously affected by the preheating temperature. The results show that the residual stresses can effectively change the properties of the materials under the combined influence of scanning strategy and preheating temperature.

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“…Other lattice defects, specific to certain fabrication routes, have also been identified. Examples include: (i) strut waviness, a feature inherent to woven metal lattices; [22,30] (ii) variations in strut cross-section, either stochastic [31] or systematic, the latter obtained in polymer lattices made by self-propagating photocuring; [32,33] and (iii) roughness on strut surfaces, invariably found in metallic lattices fabricated by selective electron beam melting [34,35] or selective laser melting. [36] Lattice material design Optimization of lattice properties requires concurrent selection of topology, morphology, and constituent material.…”

Section: Other Lattice Defectsmentioning

confidence: 99%