Crack growth measurement and <i>J</i>‐integral evaluation of additively manufactured polymer using digital image correlation and FE modeling

Bouaziz, Mohamed; Djouda, Joseph Marae; Zouaoui, Marouene; Gardan, Julien; Hild, François

doi:10.1111/ffe.13431

Cited by 9 publications

(5 citation statements)

References 63 publications

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“…However, some reported K IC values of FFF-ABS are as low as 0.79 MPa.m 1=2 , given the nonstandard testing practices that were used, that is, introducing a small hole in front of the precrack. 3 In terms of the interlayer fracture toughness, the measurement conducted in the present study (7380 J/m 2 ) is consistent with those measured by Bouaziz et al, 12 but it is much larger than the J values reported in Khosravani et al 10 The discrepancy can be attributed to two testing/ analysis differences: (1) the double cantilever beams had no large deformation correction and (2) no sharp precracks were cut. 10 Figure 4 shows the fracture surfaces of an FFF-ABS specimen (green) and one raw ABS (yellow).…”

Section: Fracture Toughness Changes Of Bulk and Fff-abssupporting

confidence: 89%

“…In additively manufactured (AM) parts, or three‐dimensional (3D) printed parts, defects primarily arise from the layer‐by‐layer nature of the process. Additionally, strength and fracture toughness of AM parts are often anisotropic 2–15 . It is crucial to understand fracture toughness of AM polymers to ensure their reliability and durability.…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, strength and fracture toughness of AM parts are often anisotropic. [2][3][4][5][6][7][8][9][10][11][12][13][14][15] It is crucial to understand fracture toughness of AM polymers to ensure their reliability and durability. To this end, this study considers three common AM polymers and two of the most widely used AM techniques for polymers: fused filament fabrication (FFF) and selective laser sintering (SLS).…”

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confidence: 99%

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Anisotropic and elastoplastic mode‐I fracture toughnesses of three additively manufactured polymers fabricated via material extrusion and powder bed fusion

Zhang,

Ghorbani,

Zheng

et al. 2023

Fatigue Fract Eng Mat Struct

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Two types of additive manufacturing (AM) techniques, fused filament fabrication (FFF) and selective laser sintering (SLS), were employed to fabricate specimens from three widely used AM polymers: polylactic acid (PLA), acrylonitrile butadiene styrene (ABS), and polyamide (PA): the first two using FFF and PA using SLS. The single‐edge notch bending (SENB) test was employed to measure the mode‐I fracture toughnesses of bulk and AM specimens in three directions relative to the printing direction. Unlike their bulk counterparts, AM polymers exhibited anisotropic fracture toughness. The degree of anisotropy in FFF‐PLA was much larger than FFF‐ABS and SLS‐PA. The smallest fracture toughness value for each AM polymer was achieved along the transverse printing direction. Different AM techniques affect fracture toughness differently. For instance, FFF is shown to increase PLA's plastic deformation, while SLS reduces PA's ductility. The decrease in fracture toughness is consistently observed when transitioning from bulk polymers to AM ones, reaching as much as 75%. This study provides insights into the fracture toughness of AM parts made via popular plastics, which are crucial for designing structural parts using FFF and SLS processes.

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Section: Fracture Toughness Changes Of Bulk and Fff-abssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Anisotropic and elastoplastic mode‐I fracture toughnesses of three additively manufactured polymers fabricated via material extrusion and powder bed fusion

Zhang,

Ghorbani,

Zheng

et al. 2023

Fatigue Fract Eng Mat Struct

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show abstract

“…In the research [6], a formulation was proposed of the FEM method to analyze crack propagation problems. In addition, a combined comparative study between the two experimental and numerical techniques was presented in research [7] to study the fracture properties of additively fabricated polymer parts using digital image correlation measurement (DIC). In this field, Shafiei [8] studied the influence of geometry on the growth of an inclined crack.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of the Crack Propagation Parameters of Two Different Elements by the Fem Method

Bentahar

2024

adeletters

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Fracture mechanics is fundamental in various fields, such as mechanical engineering, civil engineering, hydraulics, and medicine. In addition, thanks to this field, we can estimate the age of the components of a structure, and the inspection and maintenance intervals can be precise. Thus, fracture mechanics is a science that studies numerical tools to characterize various parameters, such as the contour integral (J), stress intensity factors, and internal energy. However, in this paper, comparing the two types of elements (CPS3) and (CPS4R) gives comparable and proportional results; logically, a good correlation was obtained between them. In this article, those parameters were simulated and analyzed numerically by the finite element method (FEM) of a two-dimensional model consisting of a steel material with elastic properties. The analysis of the crack parameters was evaluated by the two models of elements CPS3 and CPS4R. On the other hand, the crack parameters between the two elements were compared. In addition, the numerical simulation was carried out using the computer code ABAQUS 16.3.1.

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“…Among these few works, we can cite that of Bouaziz et al who examined in detail the evaluation of cracks in polymers manufactured by FDM based on the concept of integral J. [24].…”

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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Crack growth measurement and J‐integral evaluation of additively manufactured polymer using digital image correlation and FE modeling

Cited by 9 publications

References 63 publications

Anisotropic and elastoplastic mode‐I fracture toughnesses of three additively manufactured polymers fabricated via material extrusion and powder bed fusion

Anisotropic and elastoplastic mode‐I fracture toughnesses of three additively manufactured polymers fabricated via material extrusion and powder bed fusion

Numerical Modeling of the Crack Propagation Parameters of Two Different Elements by the Fem Method

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

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