The Effect of Chamber Temperature on Residual Stresses of FDM Parts

Casavola, Caterina; Cazzato, Alberto; Karalekas, D.; Moramarco, Vincenzo; Pappalettera, Giovanni

doi:10.1007/978-3-319-95074-7_16

Cited by 7 publications

(4 citation statements)

References 19 publications

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“…Extrusion-based additive manufacturing of thermoplastic polymers is a thermally driven process. Thermal history affects viscoelastic deformation [1][2][3], bonding [4][5][6][7][8], and residual stresses [9,10]. Consequently, dimensional accuracy and the strength of the manufactured part are driven by the thermal history of the part.…”

Section: Introductionmentioning

confidence: 99%

Discrete-Event Simulation Thermal Model for Extrusion-Based Additive Manufacturing of PLA and ABS

Bhandari

Lopez-Anido

2020

Materials

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The material properties of thermoplastic polymer parts manufactured by the extrusion-based additive manufacturing process are highly dependent on the thermal history. Different numerical models have been proposed to simulate the thermal history of a 3D-printed part. However, they are limited due to limited geometric applicability; low accuracy; or high computational demand. Can the time–temperature history of a 3D-printed part be simulated by a computationally less demanding, fast numerical model without losing accuracy? This paper describes the numerical implementation of a simplified discrete-event simulation model that offers accuracy comparable to a finite element model but is faster by two orders of magnitude. Two polymer systems with distinct thermal properties were selected to highlight differences in the simulation of the orthotropic response and the temperature-dependent material properties. The time–temperature histories from the numerical model were compared to the time–temperature histories from a conventional finite element model and were found to match closely. The proposed highly parallel numerical model was approximately 300–500 times faster in simulating thermal history compared to the conventional finite element model. The model would enable designers to compare the effects of several printing parameters for specific 3D-printed parts and select the most suitable parameters for the part.

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Section: Introductionmentioning

confidence: 99%

Discrete-Event Simulation Thermal Model for Extrusion-Based Additive Manufacturing of PLA and ABS

Bhandari

Lopez-Anido

2020

Materials

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“…Furthermore, Casavola et al (2016) showed that the FFF parts have an orthotropic behaviour similar to that of a laminate orthotropic structure. Finally, Casavola et al (2019Casavola et al ( , 2017aCasavola et al ( , 2017b analysed the effect of layers stacking sequence on the residual stress on FFF parts.…”

Section: Introductionmentioning

confidence: 99%

Effect of extrusion temperature on fused filament fabrication parts orthotropic behaviour

Attolico

Casavola

Cazzato

et al. 2019

RPJ

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Purpose The purpose of this paper is to verify the effects of extrusion temperature on orthotropic behaviour of the mechanical properties of parts obtained by fused filament fabrication (FFF) under quasi-static tensile loads. Design/methodology/approach Tensile tests were performed on single layer specimens fabricated in polylactic acid (PLA) and acrylonitrile butadiene styrene (ABS) to evaluate the mechanical properties at different extrusion temperatures and raster orientations (0°, 45° and 90°). Furthermore, a detailed study of morphological characteristics of the single layer samples cross-section and of the bonding quality among adjacent deposited filaments was performed by scanning electron microscopy to correlate the morphology of materials with mechanical behaviour. Findings The results show that the orthotropic behaviour of FFF-printed parts tends to reduce, while the mechanical properties improved with increase in extrusion temperature. Furthermore, the increase in extrusion temperature led to an improvement in inter-raster bonding quality and in the compactness and homogeneity of the parts. Originality/value The relation between the extrusion temperature, orthotropic behaviour and morphological surface characteristics of the single layer specimen obtained by FFF has not been previously reported.

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“…Here, the residual internal stress is reduced which leads to more isotropic shrinkage, and consequently, warpage is also reduced. [169][170][171] However, this strategy is needed to be explored further for a better understanding.…”

Section: Strategies To Reduce Warpage and To Improve Mechanical Prope...mentioning

confidence: 99%

Fused Deposition Modeling of Polyolefins: Challenges and Opportunities

Verma

Awasthi

Gupta

et al. 2022

Macro Materials & Eng

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Polyolefins are the largest class of commercially available synthetic polymers that are extensively used in a variety of applications from commodities to engineering owing to their low cost of production, good physico‐mechanical properties, light weight, good processability, and recyclability. Compared to conventional molding techniques, fused deposition modeling (FDM)‐based 3D printing is a smart manufacturing technology for thermoplastics due to its low cost, ease of production of complex geometrical parts, rapid prototyping, and scalable customization. FDM 3D printing can be an ideal manufacturing technology for polyolefins to manufacture various complex parts. However, FDM 3D‐printing of polyolefins is challenged bycritical printing problems like high warpage, dimensional inaccuracies, poor bed adhesion, and poor layer‐to‐layer adhesion. In this review, a fundamental understanding of polyolefins and their FDM 3D‐printing process is established, and the recent progress of FDM 3D printing of polyolefins is summarized. Furthermore, strategies to overcome warpage and to improve mechanical strength of the 3D‐printed polyolefins are provided. Finally, future prospectives of FDM 3D‐printing of polyolefins are critically discussed to inspire prospective research in this field. It is believed that this review article can be tremendously useful for research work related to FDM of polyolefin‐based materials.

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The Effect of Chamber Temperature on Residual Stresses of FDM Parts

Cited by 7 publications

References 19 publications

Discrete-Event Simulation Thermal Model for Extrusion-Based Additive Manufacturing of PLA and ABS

Discrete-Event Simulation Thermal Model for Extrusion-Based Additive Manufacturing of PLA and ABS

Effect of extrusion temperature on fused filament fabrication parts orthotropic behaviour

Fused Deposition Modeling of Polyolefins: Challenges and Opportunities

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