Fatigue strength of additively manufactured polylactide (PLA): effect of raster angle and non-zero mean stresses

Ezeh, O.H.; Susmel, Luca

doi:10.1016/j.ijfatigue.2019.05.014

Cited by 66 publications

(28 citation statements)

References 21 publications

(49 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Table 3 shows a list of mechanical properties reported for FDM-produced PLA specimens (Ezeh and Susmel, 2019;Khan et al, 2018;Leite et al, 2018;Ouballouch et al, 2018;Tymrak et al, 2014;Wittbrodt and Pearce, 2015;Yao et al, 2019).Tensile strength values in the literature exhibit a very wide range of 19-58 MPa. While most of the data is somewhat close to the bulk strength of PLA, some of the studies reported much lower strength values.…”

Section: Polylactic Acidmentioning

confidence: 99%

Mechanical properties of thermoplastic parts produced by fused deposition modeling:a review

Bakır

Özerinç

2021

RPJ

View full text Add to dashboard Cite

Purpose This paper aims to provide an overview of the recent findings of the mechanical properties of parts manufactured by fused deposition modeling (FDM). FDM has become a widely used technique for the manufacturing of thermoplastic parts. The mechanical performance of these parts under service conditions is difficult to predict due to the large number of process parameters involved. The review summarizes the current knowledge about the process-property relationships for FDM-based three-dimensional printing. Design/methodology/approach The review first discusses the effect of material selection, including pure thermoplastics and polymer-matrix composites. Second, process parameters such as nozzle temperature, raster orientation and infill ratio are discussed. Mechanisms that these parameters affect the specimen morphology are explained, and the effect of each parameter on the strength of printed parts are systematically presented. Findings Mechanical properties of FDM-produced parts strongly depend on process parameters and are usually lower than injection-molded counterparts. There is a need to understand the effect of each parameter and any synergistic effects involved better. Practical implications Through the optimization of process parameters, FDM has the potential to produce parts with strength values matching those produced by conventional methods. Further work in the field will make the FDM process more suitable for the manufacturing of load-bearing components. Originality/value This paper presents a critical assessment of the current knowledge about the mechanical properties of FDM-produced parts and suggests future research directions.

show abstract

Section: Polylactic Acidmentioning

confidence: 99%

Mechanical properties of thermoplastic parts produced by fused deposition modeling:a review

Bakır

Özerinç

2021

RPJ

View full text Add to dashboard Cite

show abstract

“…(B) Numerical results of the obtained von Mises stresses vs. applied load. (C) The endurance limit for ABS and PLA materials (Adapted from Caliskan et al, 2016 ; Ezeh and Susmel, 2019 ).…”

Section: Resultsmentioning

confidence: 99%

Suitability of the Openly Accessible 3D Printed Prosthetic Hands for War-Wounded Children

et al. 2021

View full text Add to dashboard Cite

The field of rehabilitation and assistive devices is being disrupted by innovations in desktop 3D printers and open-source designs. For upper limb prosthetics, those technologies have demonstrated a strong potential to aid those with missing hands. However, there are basic interfacing issues that need to be addressed for long term usage. The functionality, durability, and the price need to be considered especially for those in difficult living conditions. We evaluated the most popular designs of body-powered, 3D printed prosthetic hands. We selected a representative sample and evaluated its suitability for its grasping postures, durability, and cost. The prosthetic hand can perform three grasping postures out of the 33 grasps that a human hand can do. This corresponds to grasping objects similar to a coin, a golf ball, and a credit card. Results showed that the material used in the hand and the cables can withstand a 22 N normal grasping force, which is acceptable based on standards for accessibility design. The cost model showed that a 3D printed hand could be produced for as low as $19. For the benefit of children with congenital missing limbs and for the war-wounded, the results can serve as a baseline study to advance the development of prosthetic hands that are functional yet low-cost.

show abstract

“…The orientation of the filament deposition during the process as well as the part build direction can also have major impact on mechanical characteristics of the AM parts [10,11]. It has been observed through various research studies that different AM plastic materials undergoing static or cyclic loadings behave differently with respect to the raster orientation.…”

Section: -Introductionmentioning

confidence: 99%

Effects of Voids and Raster Orientations on Fatigue Life of Notched Additively Manufactured PLA Components

Fard

Behdinan

2022

Preprint

View full text Add to dashboard Cite

In this study, the fatigue life of notched Polylactic acid (PLA) samples fabricated through the fused deposition modeling (FDM) technique was studied experimentally and numerically. The volumetric method based on the theory of critical distance was employed for fatigue life predictions. The effects of influential process parameters including raster orientation and FDM-induced defects such as voids or gaps inside the parts were examined on the fatigue strength reduction factors and fatigue lives. Circular and elliptical-shaped notch geometries were considered with various dimensions. Fatigue tests were conducted on notched and un-notched samples at the load ratio of 0.1. Predicted results were compared with experimental fatigue test data. Results revealed that the raster orientation parameter had a substantial impact on fatigue strength reduction factors and fatigue lives. The stress concentrations induced by the FDM process on the surfaces and inside the parts for the samples with 90º raster angles acted similar to the sharp notches, resulting in no substantial difference in fatigue life of notched and un-notched 3D printed samples. In contrast, un-notched 3D printed specimens with 0º raster orientations possessed higher fatigue lives as compared to the notched samples. While the volumetric approach efficiently predicted the fatigue lives of the samples with 90º raster orientations, it moderately underpredicted the fatigue lives of the samples with 0º raster angles.

show abstract

Fatigue strength of additively manufactured polylactide (PLA): effect of raster angle and non-zero mean stresses

Cited by 66 publications

References 21 publications

Mechanical properties of thermoplastic parts produced by fused deposition modeling:a review

Mechanical properties of thermoplastic parts produced by fused deposition modeling:a review

Suitability of the Openly Accessible 3D Printed Prosthetic Hands for War-Wounded Children

Effects of Voids and Raster Orientations on Fatigue Life of Notched Additively Manufactured PLA Components

Contact Info

Product

Resources

About