Viscoelastic properties of fused filament fabrication parts

Quintana, José Luis Colón; Redmann, Alec; Capote, Gerardo A. Mazzei; Pérez-Irizarry, Angel; Bechara, Abrahan; Osswald, Tim A.; Lakes, Roderic S.

doi:10.1016/j.addma.2019.06.003

Cited by 10 publications

(9 citation statements)

References 11 publications

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“…Previous work demonstrated that the flexural modulus of 3D printed ABS components can be substantially different if measured on a component under static or under dynamic loading [12]. Similar observations were made by Colón Quintana et al and attributed to viscoelasticity [13]. Consequently, results from quasi-static loading of coupons, that constitute most of the current literature, are irrelevant to investigations in structural vibration.…”

Section: Introductionmentioning

confidence: 68%

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Prediction of the vibratory properties of ship models with realistic structural configurations produced using additive manufacturing

2020

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The use of flexible ship models to determine the dynamic behaviour of fullscale ships in waves and to compare the accuracy of numerical predictions has increased in the past few years. Segments attached to a flexible uniform backbone of suitable but simple cross section is the preferred solution. Although such models are relatively easy to manufacture with conventional processes, they do not represent accurately the structural detail, for example, of a container ship. The limitations of conventional manufacturing constraints can be potentially overcome by use of modern technologies such as additive manufacturing. Designing detailed elastic ship models requires the determination of dynamic material properties, in addition to the manufacturer mechanical properties.In this investigation, a detailed but easy-to-implement method is developed, and applied to a uniform container ship-like model, to identify the material properties that are relevant to the calculation of the natural frequencies of 3D printed thin-walled structures. It is demonstrated that modal testing of 3D printed specimens, combined with FEA modelling, can be used to accurately predict the natural frequencies of much more complex thin-walled structures. This method allows investigators to acquire all information necessary during the design stage of 3D printed structures without having to resort to full material characterisation.

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Section: Introductionmentioning

confidence: 68%

“…Colón Quintana et al performed a thorough dynamic mechanical analysis to characterise the material and identify the elastic, loss and storage moduli for various infill ratios [13]. It would be impractical for investigators to perform full material characterisation every time they are designing an experiment using a thin-walled structure.…”

Section: Introductionmentioning

confidence: 99%

Prediction of the vibratory properties of ship models with realistic structural configurations produced using additive manufacturing

2020

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“…For example, poly(ethylene terephthalate) (PET) has fewer warpage issues than HDPE when 3D printed and exhibits excellent mechanical properties, which could lead to improved dimensional accuracy as a shell material. High-temperature liquid crystal polymers provide enhancements in the mechanical properties, but a core–shell architecture including a semicrystalline shell would enhance the weld strength in the printed part. Similarly, these results can be applied to polymer blends, where one phase solidifies at significantly higher temperatures, which may help to explain some reports about improvements in printing with polymer blends …”

Section: Resultsmentioning

confidence: 99%

Enhanced Dimensional Accuracy of Material Extrusion 3D-Printed Plastics through Filament Architecture

Peng

Joo

et al. 2021

ACS Appl. Polym. Mater.

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Optimization of three-dimensional (3D) print conditions for material extrusion of plastics by fused filament fabrication typically involves trade-offs between mechanical properties and dimensional accuracy due to their orthogonal requirements. Increased polymer mobility improves the mechanical properties by chain diffusion to strengthen the interfaces between printed roads, but flow associated with the high polymer mobility leads to inaccuracies. Here, we describe the application of a model core–shell geometry in filaments to address these trade-offs and understand the material requirements to achieve improved dimensional accuracy. Systematic variation of the core with commercial polycarbonate-based plastics and a common high-density polyethylene (HDPE) shell illustrates that tensile properties obtained with these filaments are relatively insensitive to printing conditions and selection of the core polymer, but the dimensional accuracy of the printed part improves markedly as the glass transition temperature of the core polymer increases. The impact resistance of the core–shell-based parts is dependent on the selection of the core polymer with a significant decrease in impact resistance for the lowest modulus core examined. Although warping can be mostly mitigated with the core–shell filaments, the printed object is generally smaller than the digital source due to large volume change associated with HDPE crystallization. The dimensional accuracy is dependent on the solidification temperature and mechanical properties of the polymers comprising the filament, print conditions, and the local geometry of the object as quantified by layer-by-layer analysis of 3D scanned images of the printed objects. Both processing changes and some structures in the digital object that can degrade the dimensional accuracy are identified through this analysis. The core–shell filament structure represents a model geometry to understand the potential for the printing of polymer blends where separation of solidification temperatures in cocontinuous blends could provide a route to improve performance.

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“…The analysis of the modulus assumes the manufacturer quote of the modulus of the parent material. The 3D‐printed solid phase is usually less stiff than the parent material [ 27 ] used as feedstock. Therefore, the modulus/density performance of the gyroid is likely to be superior to the values inferred and closer to the upper bound.…”

Section: Discussionmentioning

confidence: 99%

Poisson's Ratio and Modulus of Gyroid Lattices

DeValk

Lakes

2021

Physica Status Solidi (b)

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Gyroid surface lattices of different densities exhibit Young's modulus consistent with stretch‐dominated extremal behavior approaching the Hashin–Shtrikman upper bound. The gyroid lattices exhibit a Poisson's ratio of 0.34 ± 0.06 independent of direction, independent of specimen diameter, and independent of chirality. This behavior is in contrast with prior chiral lattices that exhibited pronounced size effects in Poisson's ratio, allowable for chiral elastic solids.

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Viscoelastic properties of fused filament fabrication parts

Cited by 10 publications

References 11 publications

Prediction of the vibratory properties of ship models with realistic structural configurations produced using additive manufacturing

Prediction of the vibratory properties of ship models with realistic structural configurations produced using additive manufacturing

Enhanced Dimensional Accuracy of Material Extrusion 3D-Printed Plastics through Filament Architecture

Poisson's Ratio and Modulus of Gyroid Lattices

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