Curved-Layered Additive Manufacturing of non-planar, parametric lattice structures

McCaw, John C.S.; Cuan-Urquizo, Enrique

doi:10.1016/j.matdes.2018.10.024

Cited by 65 publications

(45 citation statements)

References 38 publications

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“…Among them, fused filament fabrication (FFF), selective laser sintering (SLS), stereolithography (SLA), laminated object manufacturing (LOM) and fused particle fabrication (FPF) are of relevant importance [1,2,3,4,5,6]. In particular, the FFF technique is the most used method for polymer-based modeling [7,8,9]. Although FFF of various polymers has already been commercialized, there is still the need to perform some fundamental studies to improve the process.…”

Section: Introductionmentioning

confidence: 99%

Effect of Porosity and Crystallinity on 3D Printed PLA Properties

et al. 2019

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Additive manufacturing (AM) is a promising technology for the rapid tooling and fabrication of complex geometry components. Among all AM techniques, fused filament fabrication (FFF) is the most widely used technique for polymers. However, the consistency and properties control of the FFF product remains a challenging issue. This study aims to investigate physical changes during the 3D printing of polylactic acid (PLA). The correlations between the porosity, crystallinity and mechanical properties of the printed parts were studied. Moreover, the effects of the build-platform temperature were investigated. The experimental results confirmed the anisotropy of printed objects due to the occurrence of orientation phenomena during the filament deposition and the formation both of ordered and disordered crystalline forms (α and δ, respectively). A heat treatment post-3D printing was proposed as an effective method to improve mechanical properties by optimizing the crystallinity (transforming the δ form into the α one) and overcoming the anisotropy of the 3D printed object.

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Section: Introductionmentioning

confidence: 99%

Effect of Porosity and Crystallinity on 3D Printed PLA Properties

et al. 2019

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“…The results showed that auxetic lattice reinforced composites have enhanced mechanical performance and can absorb more energy compared with non-auxetic lattice reinforced composites. McCaw and Cuan-Urquizo 12 fabricated a variety of sinusoidal patterns of various density and amplitude with poly lactic acid (PLA) by FDM 3D printing, and the mechanical properties were analyzed using the failure test. They reported that the sinusoidal patterns with high density and normalized amplitude significantly delayed fracture until after the disrupted sinusoidal patterns and the quadratic patterns, possibly due to more strain than other patterns, though they did finally fracture.…”

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confidence: 99%

Physical property of 3D-printed sinusoidal pattern using shape memory TPU filament

Kabir

Kim

Lee

2020

Textile Research Journal

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This study has investigated the physical properties of 3D-printable shape memory thermoplastic polyurethane (SMTPU) filament and its 3D-printed sinusoidal pattern obtained by fused deposition modeling (FDM) technology. To investigate 3D filaments, thermoplastic polyurethane (TPU) and SMTPU filament were examined by conducting infrared spectroscopy, x-ray diffraction (XRD), dynamic mechanical thermal analysis (DMTA), differential scanning calorimetry (DSC) and a tensile test. Then, to examine the 3D-printed sinusoidal samples, a sinusoidal pattern was developed and 3D-printed. Those samples went through a three-step heating process: (a) untreated state; (b) 5 min heating at 70°C, cooling for 30 min at room temperature; and (c) a repeat of step 2. The results obtained by the three different heating processes of the 3D-printed sinusoidal samples were examined by XRD, DMTA, DSC and the tensile test to obtain the effect of heating or annealing on the structural and mechanical properties. The results show significant changes in structure, crystallinity and thermal and mechanical properties of SMTPU 3D-printed samples due to the heating steps. XRD showed the increase in crystallinity with heating. In DMTA, storage modulus, loss modulus and the tan σ peak position also changed for various heating steps. The DSC result showed that the Tg for different steps of the SMTPU 3D-printed sample remained almost the same at around 51°C. The tensile property of the TPU 3D-printed sinusoidal sample decreased in terms of both load and elongation with increased heating processes, while for the SMTPU 3D-printed sinusoidal sample, the load decreased but elongation increased about 2.5 times.

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“…The lengths to be added along the edges are extracted from the values obtained from the property gradient map, illustrated in Figure 4. The Poisson effect can also be tailored using well-established principles and patterns from the field of meta-material mechanisms [Kolken and Zadpoor 2017;McCaw and Cuan-Urquizo 2018], and the effect of changing other parameters such as the geometry can be explored.…”

Section: Mesostructure Networkmentioning

confidence: 99%