Analysis of the resistance to crack propagation in SENT test specimens printed in ABS using parallel or crossed filaments between layers

Aourik, Oumaima; Chouaf, Abdelkerim; Othmani, Mourad

doi:10.3221/igf-esis.63.19

Cited by 2 publications

(1 citation statement)

References 28 publications

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“…With this in mind, we turned our attention to the damage aspects of printed parts. In a previous study, we carried out tensile tests on SENT specimens printed in ABS, in order to investigate the effect of the raster angle on resistance to crack propagation [22].…”

Section: Introductionmentioning

confidence: 99%

Fracture phases of the CT specimens printed in PLA according to the raster width

Aourik

Chouaf

Othmani

2023

Preprint

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This article investigates the impact of raster width on crack propagation resistance in structures manufactured using the FDM (Fused Deposition Modeling) additive manufacturing process. This process involves a large number of variables to be controlled, which influence the mechanical properties and quality of the parts produced. During layer-by-layer printing, the filaments making up each layer fuse together on adjacent and overlapping sides. This fusion occurs at the contact surfaces, which depend mainly on the raster's width and the deposited filaments' length. The quality of this fusion plays a crucial role in the resistance to crack propagation, both between filaments and between layers. Therefore, this article aims to examine how raster width affects resistance to crack propagation in FDM structures. In this study, we developed two approaches; one is experimental based on CT (Compact Tension) specimens to assess the fracture toughness of poly-lactic acid (PLA)-based polymers using the theoretical approach of the J integral. To do so, we determined the strength curves (J-∆a) and deduced the JIC parameter for different raster widths (l = 0.42 mm, l = 0.56 mm and l = 0.68 mm). To better understand the behavior of contact zones between filaments during fracture, we developed a simplified numerical approach. The numerical results obtained were analyzed and discussed on the basis of observations of the fracture facies of CT specimens.

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Section: Introductionmentioning

confidence: 99%

Fracture phases of the CT specimens printed in PLA according to the raster width

Aourik

Chouaf

Othmani

2023

Preprint

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Experimental study of the fracture of CT specimens printed in PLA as a function of the raster width

Aourik,

Othmani,

Chouaf

2023

Archives of Materials Science and Engineering

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The FDM (Fused Deposition Modelling) additive manufacturing process is characterised by a large number of process variables that determine the mechanical properties and quality of the manufactured parts. When printing layer by layer, the filaments constituting the layer are welded on the one hand between them in the same layer and on the other hand between the superimposed layers, this welding develops on the contact surfaces (raster width) along the deposited filaments. The quality of this welding determines the resistance to crack propagation between filaments and between layers. This article aims to study the effect of the width of the raster on the resistance to crack propagation in a structure obtained by FDM.We have developed an experimental approach from CT specimens to determine the tensile strength of polylactic acid (PLA) polymers, considering the J-Integral method. And given the complexity of the problem, three cases of raster width (l=0.42 mm, l=0.56 mm and l=0.68 mm) have been treated.According to the results obtained (J, ∆a), the resistance to crack propagation in the parts printed by FDM seems to be better when the width of the filament is small. Indeed, the energy necessary to break the specimen is relatively greater than in the case of a larger width. This finding was confirmed by comparing the values of J for a given advancement of the crack for the three cases studied.In order to present an exhaustive study, we focused on the effect of raster widths (including 0.42 mm, 0.56 mm to 0.68 mm) on the crack propagation of printed PLA. This study is in progress for other printing parameters. To highlight the cracking mechanisms, microscopic observations will be developed in greater depth at the SEM.Our analysis can be used as decision support in the design of FDM parts. In effect, we can choose the raster width that would provide the resistance to crack propagation desired for a functional part.In this article, we analysed the damage mechanism of CT specimens printed by FDM. This subject represents a new direction for many lines of research. For our study, we used the J-Integral theoretical approach to study the fracture behaviour of these parts by determining the resistance curves (J-∆a).

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Analysis of the resistance to crack propagation in SENT test specimens printed in ABS using parallel or crossed filaments between layers

Cited by 2 publications

References 28 publications

Fracture phases of the CT specimens printed in PLA according to the raster width

Fracture phases of the CT specimens printed in PLA according to the raster width

Experimental study of the fracture of CT specimens printed in PLA as a function of the raster width

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