The Influence of the 3D Printing Infill and Printing Direction on Friction and Wear of Polylactic Acid (PLA) under Rotational Sliding

Živić, Fatima; Mitrović, Slobodan; Grujović, Nenad; Jovanovic, Zivana; Džunić, Dragan; Milenkovic, Strahinja

doi:10.3103/s1068366621020124

Cited by 3 publications

(3 citation statements)

References 8 publications

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“…Additionally, it can cause stress concentration within the structure that can have negative effects on the patient vessels [ 46 ]. It was shown that FDM printed parts exhibit superior tribological characteristics along the fiber printing direction when compared both to direction transverse to a printed fibers direction and to a layer stacking direction [ 56 ].…”

Section: Resultsmentioning

confidence: 99%

Thermo-Mechanical Characterization of 4D-Printed Biodegradable Shape-Memory Scaffolds Using Four-Axis 3D-Printing System

et al. 2023

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This study was conducted on different models of biodegradable SMP (shape-memory polymer) scaffolds. A comparison was conducted utilizing a basic FDM (fused deposition modeling)/MEX (material extrusion) printer with a standard printing technique and a novel, modified, four-axis printing method with a PLA (poly lactic acid) polymer as the printing material. This way of making the 4D-printed BVS (biodegradable vascular stent) made it possible to achieve high-quality surfaces due to the difference in printing directions and improved mechanical properties—tensile testing showed a doubling in the elongation at break when using the four-axis-printed specimen compared to the regular printing, of 8.15 mm and 3.92 mm, respectfully. Furthermore, the supports created using this method exhibited a significant level of shape recovery following thermomechanical programming. In order to test the shape-memory effect, after the thermomechanical programming, two approaches were applied: one approach was to heat up the specimen after unloading it inside temperature chamber, and the other was to heat it in a warm bath. Both approaches led to an average recovery of the original height of 99.7%, while the in-chamber recovery time was longer (120 s) than the warm-bath recovery (~3 s) due to the more direct specimen heating in the latter case. This shows that 4D printing using the newly proposed four-axis printing is an effective, promising technique that can be used in the future to make biodegradable structures from SMP.

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Section: Resultsmentioning

confidence: 99%

Thermo-Mechanical Characterization of 4D-Printed Biodegradable Shape-Memory Scaffolds Using Four-Axis 3D-Printing System

et al. 2023

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“…In [19] and [22], the CoF of PLA was shown to be dependent on infill density and printing orientation. In [22], PLA parts printed at 20% infill density with a horizontal printing orientation had a CoF between 0.74 and 1.04, depending on the applied load. An intermediate value of 0.89 was assumed in this study to represent the CoF.…”

Section: ( )mentioning

confidence: 99%

“…Contact between the soft actuator's body and the dummy finger (contact between PLA and Dragon Skin 10), contact between the coupling link and the elastic band (contact between Smooth-On Sil 950 and PLA), and contact between the coupling link and the dummy finger (contact between PLA and PLA) 7) Coefficient of Friction between PLA and PLA: Several studies have been done previously to measure the coefficient of friction (CoF) of PLA in contact with hard surfaces [19], [22]. In [19] and [22], the CoF of PLA was shown to be dependent on infill density and printing orientation. In [22], PLA parts printed at 20% infill density with a horizontal printing orientation had a CoF between 0.74 and 1.04, depending on the applied load.…”

Section: ( )mentioning

confidence: 99%

Development of a Dual Function Joint Modular Soft Actuator and its Evaluation Using a Novel Dummy Finger Joint-Soft Actuator Complex Model

Tortós-Vinocour,

Kokubu,

Matsunaga

et al. 2024

IEEE Robot. Autom. Lett.

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Soft actuators, made from soft materials, offer a safer alternative to rigid robots for use on hand rehabilitation devices. A current challenge is to ensure these actuators comply with human finger morphology. To gain better insights into actuator mechanics when worn on and interacting with human fingers, combining physical experiments with simulation approaches is necessary. However, no simulation has been implemented for finger-actuator interactions. This study proposes a new joint modular soft actuator designed to comply with a dummy finger joint. The new actuator has a dual function design for increasing axial elongation during bending, facilitating compliance with finger morphology. In addition, a novel FEM for the new actuator's interaction with the dummy finger joint (dummy joint-soft actuator complex) is developed and used with physical experiments for evaluating actuator performance. Results show that the new design increases the dummy joint's bending range while exerting smaller contact forces on the joint. Even when the joint is blocked at specific bending angles, the actuator remains compliant to finger morphology. This research is a significant advancement in soft actuator design for hand rehabilitation, emphasizing the interaction between human fingers and soft actuators.

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Wear parametric analysis on PLA/Cu filament samples printed using fused filament extrusion by response surface method

Balamurugan¹,

Pavan²,

Balamurugan

2022

Prog Addit Manuf

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The Influence of the 3D Printing Infill and Printing Direction on Friction and Wear of Polylactic Acid (PLA) under Rotational Sliding

Cited by 3 publications

References 8 publications

Thermo-Mechanical Characterization of 4D-Printed Biodegradable Shape-Memory Scaffolds Using Four-Axis 3D-Printing System

Thermo-Mechanical Characterization of 4D-Printed Biodegradable Shape-Memory Scaffolds Using Four-Axis 3D-Printing System

Development of a Dual Function Joint Modular Soft Actuator and its Evaluation Using a Novel Dummy Finger Joint-Soft Actuator Complex Model

Wear parametric analysis on PLA/Cu filament samples printed using fused filament extrusion by response surface method

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