Failure criterion for PA12 SLS additive manufactured parts

Obst, Philip; Launhardt, Martin; Drummer, Dietmar; Osswald, Paul Victor; Osswald, Tim A.

doi:10.1016/j.addma.2018.04.008

Cited by 29 publications

(19 citation statements)

References 7 publications

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“…The main polymer powder used in the MJF process is polyamide 12 (PA12), which is by far the most widely utilised polymeric powder for polymer powder bed fusion technologies (Bai et al 2013;Cai et al 2021). PA12 components have been widely utilised in the aerospace and automotive industries owing to their superior impact resistance and fatigue resistance (Obst et al 2018). However, the high cost of PA12 powders and the overall inferior properties of printed PA12 parts for certain demanding environments (e.g.…”

Section: Introductionmentioning

confidence: 99%

A detailed evaluation of surface, thermal, and flammable properties of polyamide 12/glass beads composites fabricated by multi jet fusion

Guo

Luo

et al. 2021

Virtual and Physical Prototyping

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Multi jet fusion (MJF) is an emerging powder three-dimensional (3D) printing technology with an ultrafast printing speed, in which polyamide 12 (PA12) is the main material currently utilised. Although structurally sophisticated 3D components have been printed by MJF, there are limitations due to the high cost of printing materials and inferior performance of the printed parts. Here, PA12/glass beads (PA12/GBs) composites with improved performance were manufactured via the MJF technique. Incorporating GBs effectively regulated the dimensional accuracy. Furthermore, the composite possessed lower surface roughness and higher surface hardness than neat PA12. Thermal analysis showed that the composite exhibited an enhanced decomposition temperature (390°C) and char yield (38.4 wt.%) compared to neat PA12. Remarkably, the incorporation of GBs did not improve the flame retardance of neat PA12. We identified the improved functionalities of PA12/GBs composites in terms of dimensional accuracy, surface, and thermal properties and analysed possible mechanisms for the observed increased flammability.

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Section: Introductionmentioning

confidence: 99%

A detailed evaluation of surface, thermal, and flammable properties of polyamide 12/glass beads composites fabricated by multi jet fusion

Guo

Luo

et al. 2021

Virtual and Physical Prototyping

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“…Efforts in assessing the failure predictions of PA12 samples obtained by SLS have been conducted. The work was based on implementing the failure criterion for AM parts in tensile, compression and shear [17].…”

Section: Introductionmentioning

confidence: 99%

Mode I Fracture Toughness of Polyamide and Alumide Samples obtained by Selective Laser Sintering Additive Process

2020

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Selective Laser Sintering is a flexible additive manufacturing technology that can be used for the fabrication of high-resolution parts. Alongside the shape and dimension of the parts, the mechanical properties are essential for the majority of applications. Therefore, this paper investigates dimensional accuracy and mode I fracture toughness (KIC) of Single Edge Notch Bending samples under a Three Point Bending fixture, according to the ASTM D5045-14 standard. The work focuses on the influence of two major aspects of additive manufacturing: material type (Polyamide PA2200 and Alumide) and part orientation in the building environment (orientations of 0°, 45° and 90° are considered). The rest of the controllable parameters remains constant for all samples. The results reveal a direct link between the sample densities and the dimensional accuracy with orientation. The dimensional accuracy of the samples is also material dependent. For both materials, the angular orientation leads to significant anisotropic behavior in terms of KIC. Moreover, the type of material fundamentally influences the KIC values and the fracture mode. The obtained results can be used in the development of additive manufactured parts in order to obtain predictable dimensional tolerances and fracture properties.

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“…Obst et al . developed a 3D failure criterion, that include interaction strength tensor components, to capture the strength behavior of selective laser sintering components under complex loading conditions And Mazzei et al . proposed a failure surface, which can prove an invaluable tool in formalizing the embrace of fused filament fabrication in industry .…”

Section: Introductionmentioning

confidence: 99%

“…developed a 3D failure criterion, that include interaction strength tensor components, to capture the strength behavior of selective laser sintering components under complex loading conditions 13 And Mazzei et al proposed a failure surface, which can prove an invaluable tool in formalizing the embrace of fused filament fabrication in industry. 14 Moreover, the effects of build direction and orientation on the mechanical response and failure mechanism for ABS specimens fabricated by FDM utilize fractographic methods employing scanning electron microscope (SEM) images.…”

Section: Introductionmentioning

confidence: 99%

Influence of the molding angle on tensile properties of FDM parts with orthogonal layering

Ding

Kong

Yan-juan

et al. 2019

Polymers for Advanced Techs

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Fused deposition molding (FDM) is one of the most widely used three‐dimensional (3D) printing technologies. This paper explores the influence of the forming angle on the tensile properties of FDM specimens. Orthogonal layering details were studied through experiments, theory, and finite element simulations. The stiffness and strength of the specimens were analyzed using the classical laminated plate theory and the Tsai–Wu failure criterion. The experimental process was simulated using finite element simulations. Results show that it is feasible to predict the stiffness and strength of FDM specimens using classical laminated plate theory and the Tsai–Wu failure criterion. A molding angle of 45° leads to specimens with maximized tensile properties. Numerical simulations show that changing the molding angle changes the internal stress and deformation fields inside samples, leading to FDM samples with different mechanical properties due to the orthogonal layers at different molding angles.

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Failure criterion for PA12 SLS additive manufactured parts

Cited by 29 publications

References 7 publications

A detailed evaluation of surface, thermal, and flammable properties of polyamide 12/glass beads composites fabricated by multi jet fusion

A detailed evaluation of surface, thermal, and flammable properties of polyamide 12/glass beads composites fabricated by multi jet fusion

Mode I Fracture Toughness of Polyamide and Alumide Samples obtained by Selective Laser Sintering Additive Process

Influence of the molding angle on tensile properties of FDM parts with orthogonal layering

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