The notch effect on additive manufactured polymers

Marșavina, Liviu; Negru, Radu; Şerban, Dan Andrei; Marghitas, Mihai P.; Popa, Cosmin

doi:10.1016/j.prostr.2023.07.045

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…The growing crack finds a barrier in such discontinuities. This effect of crack arrest by printer layers was also noticed in [17], even for static loading. It was seen the phenomena of load relaxation which has been documented for polymers.…”

Section: Fractographic Analysissupporting

confidence: 61%

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Notch Sensitivity Study in U-notched Polymers Built by Additive Manufacturing (AM)

Diaz Rodriguez,

Pertuz Comas,

Sandoval Herrera

2023

Frattura Ed Integrità Strutturale

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Onyx ® is a new material composed of Polyamide 6 reinforced with short carbon fiber, used in the novel additive manufacturing composites technique. This paper aims to present the axial fatigue performance of this material with and without U-notches. The experimentally determined S-N fatigue curve was obtained under axial load with a load inversion ratio, R = 0.1, and compared to fatigue performance of U-notched samples ranging from 0.25 to 2 mm radius. In addition, the stress concentration factor was compared for static and alternative loading to obtain the notch sensitivity in terms of the U-notch radius, showing that there is indeed a difference in stress concentration between them. The advantage of the approach is that it permits using commonly used dimensioning methods for this AM material.

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Section: Fractographic Analysissupporting

confidence: 61%

“…U-notches show higher reproducibility than V-notches [15]. Recently, Marsavina et al [17] showed that, indeed V-notches require less energy than U-notches to fracture. Therefore, fatigue life decreases significantly with a reduced notch radius [11].…”

Section: Introductionmentioning

confidence: 99%

Notch Sensitivity Study in U-notched Polymers Built by Additive Manufacturing (AM)

Diaz Rodriguez,

Pertuz Comas,

Sandoval Herrera

2023

Frattura Ed Integrità Strutturale

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“…However, the printing angle of 45° does not lead to a significant change in the crack path as the same fully transverse crack propagation occurs irrespective of the initial crack orientation. Marsavina et al [ 51 ] studied different notch geometries in circular bend polymeric specimens obtained by material extrusion. The authors observed similar crack patterns that fit the filament arrangement.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Microstructural Arrangement on the Failure Characteristics of 3D-Printed Polymers: Exploring Damage Behaviour in Acrylonitrile Butadiene Styrene

Guessasma,

Belhabib

2024

Materials

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This study investigated how printing conditions influence the fracture behaviour of 3D-printed acrylonitrile butadiene styrene (ABS) under tensile loading. Dog-bone-shaped ABS specimens were produced using the fusion filament fabrication technique, with varying printing angles. Tensile tests were conducted on pre-notched specimens with consistent pre-notch lengths but different orientations. Optical and scanning electron microscopies were employed to analyse crack propagation in the pre-notched specimens. In order to support experimental evidence, finite element computation was implemented to study the damage induced by the microstructural rearrangement of the filaments when subject to tensile loading. The findings revealed the simple linear correlation between the failure properties including elongation at break and maximum stress in relation to the printing angle for different pre-notch lengths. A more progressive damage was found to support the ultimate performance of the studied material. This experiment evidence was used to build a damage model of 3D-printed ABS that accounts for the onset, growth, and damage saturation. This damage modelling is able to capture the failure properties as a function of the printing angle using a sigmoid-like damage function and a modulation of the stiffness within the raster. The numerical results demonstrated that damage pattern develops as a result of the filament arrangement and weak adhesion between adjacent filaments and explains the diffuse damage kinetics observed experimentally. This study concludes with a topological law relating the notch size and orientation to the rupture properties of 3D-printed ABS. This study supports the idea of tailoring the microstructural arrangement to control and mitigate the mechanical instabilities that lead to the failure of 3D-printed polymers.

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“…Therefore, it can be supposed that in this case, the geometry of other types of samples are closer to a behavior characterized by sharp notches, which can be stress concentrators and cause earlier cracking when the volume fraction Vf of the material increases, at which the length of the struts and the angle between them also play a large role. However, this hypothesis will need to be investigated in more detail, which the authors would like to do in the near future [52][53][54].…”

Section: Energy Absorption and Ductility Assesmentmentioning

confidence: 99%

Comparison of the Bending Behavior of Cylindrically Shaped Lattice Specimens with Radially and Orthogonally Arranged Cells Made of ABS

Monkova,

Monka,

Vodilka

2024

Polymers

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The article deals with the comparison of the bending behavior of cylindrical lattice samples with radially and orthogonally arranged cells made of ABS material. The structures were designed in PTC Creo Parametric 8 software, while four types of lattice structures were evaluated: Rhombus, Cuboidal BCC, Octagon, and Starry, in three material volume fractions: 44, 57, and 70%, together with tubular and rod-shaped samples. The Fused Filament Fabrication (FFF) technique was chosen for the production of ABS plastic samples. Based on the bending tests, the dependences of the force on the deflection were recorded and the obtained data were statistically processed to identify outliers using the Grubbs test. The maximum stresses were calculated and the dependences of the stresses on the volume fractions were plotted. Along with energy absorption, ductility indices were also specified. Although the Rhombus structure appears to be the best based on the ductility indices obtained, on the other hand, the structure showed the lowest values of bending stresses (in the range from 10.6 to 12.6 MPa for volume fractions ranging from 44 to 70%, respectively). Therefore, from a synergic point of view of both factors, stress and ductility, the Starry structure exhibits the best flexural properties among those investigated.

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The notch effect on additive manufactured polymers

Cited by 4 publications

References 12 publications

Notch Sensitivity Study in U-notched Polymers Built by Additive Manufacturing (AM)

Notch Sensitivity Study in U-notched Polymers Built by Additive Manufacturing (AM)

The Influence of Microstructural Arrangement on the Failure Characteristics of 3D-Printed Polymers: Exploring Damage Behaviour in Acrylonitrile Butadiene Styrene

Comparison of the Bending Behavior of Cylindrically Shaped Lattice Specimens with Radially and Orthogonally Arranged Cells Made of ABS

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