Crack Propagation in Flexural Testing of Additive Manufactured Acrylonitrile Butadiene Styrene

Rosenthal, Y.; Stern, A.; Treivish, I.; Ashkenazi, D.

doi:10.35219/awet.2019.03

Cited by 5 publications

(8 citation statements)

References 7 publications

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“…1). The printing extrusion's measured temperature was 285 °C, the building chamber measured temperature was 70 °C, the layer thickness was 0.178 mm, and the nozzle speed during extrusion was up to 12.7 mm/sec, as recommended by the manufacturer [22], [24]. There are three available material filling options for this system (low density, high density and solid).…”

Section: Specimensmentioning

confidence: 99%

“…Because AM-FFF products are built in layers, the resulting structure and properties are expected to be anisotropic. The most common discontinuities in the printed parts are inter-and intra-layer porosity and imperfect bond-lines [12] - [24]. The FFF method is limited to materials with a low melting temperature.…”

Section: Introuctionmentioning

confidence: 99%

“…When the raster angle rises, the bonding between neighboring filaments (intra-layer bond) is further involved in carrying the load. It has been widely publicized that the inter-layer raster-to-raster (layer-to-layer) bonding, shrinkage of the rasters, and higher porosity in particular orientations influence the properties of the printed parts and generate anisotropy [22] - [24], [27] - [29], [33] - [38]. In general, the reported tensile properties of AM-FFF polymers are lower than those of conventionally produced polymers, mostly because of voids existing in the AM-FFF specimens [4].…”

Section: Introuctionmentioning

confidence: 99%

“…In the present study, as a part of an ongoing project [1], [22] - [24], an effort has been made to gain further knowledge concerning the mechanical properties, structure, and fracture behavior of AM-FFF ABS specimens examined by three-point bend testing. The structure, including discontinuities in 3Dprinted samples was visualized and analyzed.…”

Section: Introuctionmentioning

confidence: 99%

See 3 more Smart Citations

Mechanical Performance, Structure and Fractography of ABS Manufactured by the Fused Filament Fabrication Additive Manufacturing

Stern¹,

Rosenthal²,

Richkov³

et al. 2022

AWET

Self Cite

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Fused filament fabrication (FFF) is the most widely used additive manufacturing (AM) technology for printing thermoplastic materials, among them the ABS. A significant problem of 3D-printed parts manufactured by AM-FFF is the anisotropy of their mechanical properties. Thus, it is of great importance to understand the impact of the build strategy of the mechanical properties and failure mechanisms of AM-FFF ABS components. This research aims, at least partly, to fill this gap by studying the structure and mechanical behavior by performing fracture surface analysis of AM-FFF ABS specimens under the three-point bend test. For this purpose, three build orientations (flat, on-edge and upright), each built at 0°/90° and -45°/+45° raster angles and oblique printed samples (0°, 15°, 30°, 45°, 60°, and 75°) built at -45°/+45° raster angles were prepared. The results revealed that the build direction with the lowest density, the flexural modulus of elasticity, flexural strength, and deflection was in the upright direction for both 0°/90° and -45°/+45° raster orientations. Overall, two main failure modes were observed for the tested specimens: (1) inter-layer/inter-raster bond failure, which is the main contributor to failure of all upright samples and (2) intra-layer/trans-raster failure, which is the main contributor to failure of flat and on-edge specimens printed at -45°/+45° raster orientation. The results of the oblique printed samples demonstrate that a single crack initiation can transform into a few inter-laminar and intra-laminar fracture surfaces due to competing stress fields and structural gradients

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Section: Specimensmentioning

confidence: 99%

Section: Introuctionmentioning

confidence: 99%

Section: Introuctionmentioning

confidence: 99%

Section: Introuctionmentioning

confidence: 99%

See 2 more Smart Citations

Mechanical Performance, Structure and Fractography of ABS Manufactured by the Fused Filament Fabrication Additive Manufacturing

Stern¹,

Rosenthal²,

Richkov³

et al. 2022

AWET

Self Cite

View full text Add to dashboard Cite

show abstract

“…Li [13] tried to improve the mechanical properties of the deposited polymer by adding a second source of energy, which was ultrasonic vibration. Rosenthal [14] analysed the propagation of the cracks in a specific product, which is an application of the additive manufacturing in medicine. A general view over the potential of the additive manufacturing in prototyping was presented by Go [15].…”

Section: Introductionmentioning

confidence: 99%

Metal Alloys for Filaments in 3D Fusion Filament Modelling Printing Process

Ciornei¹,

Savu

2020

ANN_UDJG_AWET

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The paper presents experimental research regarding the application of specific low melting metals in the FDM process. Previous trends in the transfer of the filament from the spool to the hot-end showed that the filament undergoes specific mechanical stress during the transfer. To achieve an appropriate transfer the filament should prove stiffness and resistance to the mechanical actions of the transfer wheels. At the same time, the entrance to the hot-end creates specific resistance to the movement of the filament, and the filament undergoes important deformations. The experimental research used three materials characterized by melting temperature below 260oC: Sn-58Bi, Sn-9Zn, and Sn-3.5Ag. Sn-58Bi showed a yield stress above 50 MPa, but very low extension during the tensile test. Sn-9Zn exhibited a yield stress above 30 MPa, and about double the extension during the tensile test. Sn-3.5Ag displayed a yield stress above 25 MPa, and extension in excess of 8%. The analysis of the surface was performed, revealing that the increase of the yield stress influenced the appearance of specific prints given by the transfer wheels. The deepest prints were measured for Sn-3.5Ag and they were maximum 100 μm. The other two materials were stiffer and the prints have depths below 50 μm. According to the obtained results, each of the tested materials can be an appropriate solution to filament use for the FDM 3D printing process.

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Development of a laser‐assisted fused deposition modeling process for improvement in bond tensile strength of ABS

Biswal,

Metcalf,

Stefanescu

et al. 2024

Journal of Polymer Science

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Fused deposition modeling (FDM), an advanced 3D printing method, is a rapidly growing technology for realizing geometrically complex parts. FDM utilizes a thermoplastic feedstock that is heated and extruded through a nozzle to build up layers of material following toolpaths prescribed by three‐dimensional (3D) data. However, the rapid thermal cycles that the material undergoes during this process limit the formation, growth, and entanglement of the molecular chains in the material. Herein, we have proposed a novel laser‐assisted fused deposition modeling (LAFDM) process for the improvement in printed part properties such as bond width and tensile strength. The LAFDM system was developed consisting of an infrared laser, coupled with an industrial FDM printer. Using an adapted tensile testing method, the bond strength between deposited layers of acrylonitrile butadiene styrene (ABS) in 3D‐printed structures was assessed. Thermogravimetric analysis was used to monitor the thermal stability of the polymer to detect alterations to the chemical composition of the material as a result of the processing conditions. A 9.5% increase in the average bond tensile strength for the LAFDM‐printed specimen was observed compared to that of the non‐laser‐assisted FDM‐printed specimen. The improvement to the bond strengths was achieved without compromising the thermal stability of the polymer.

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Crack Propagation in Flexural Testing of Additive Manufactured Acrylonitrile Butadiene Styrene

Cited by 5 publications

References 7 publications

Mechanical Performance, Structure and Fractography of ABS Manufactured by the Fused Filament Fabrication Additive Manufacturing

Mechanical Performance, Structure and Fractography of ABS Manufactured by the Fused Filament Fabrication Additive Manufacturing

Metal Alloys for Filaments in 3D Fusion Filament Modelling Printing Process

Development of a laser‐assisted fused deposition modeling process for improvement in bond tensile strength of ABS

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