Effect of temperature on the fracture behavior of polyamide 12 and glass-filled polyamide 12 processed by selective laser sintering

Cano, A.J.; Salazar, A.; Rodrı́guez, J.

doi:10.1016/j.engfracmech.2018.07.035

Cited by 49 publications

(37 citation statements)

References 21 publications

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“…This is based on observing both holes left in the polymer matrix, where the spheres have dislodged as well as what visually appears to be relatively poor polymer to glass sphere bonding. Previous authors have highlighted the importance of a strong bond strength between the polymer and the glass, in order to achieve optimal mechanical performance [24,27]. MPa respectively.…”

Section: Mechanical Performancementioning

confidence: 99%

“…In their spherical form, they are reported to allow for high packing fractions, enhanced flow characteristics, increased part isotropy and less warpage -therefore making them a common choice for reinforcement [24,25]. In terms of mechanical performance, thermoplastic filled glass bead parts have been well characterised for SLS [24,[26][27][28]. Cano et al [27] studied the influences of temperature and print orientation on the mechanical properties of PA12 and PA12 reinforced with glass beads, printed via SLS.…”

Section: Introductionmentioning

confidence: 99%

“…In terms of mechanical performance, thermoplastic filled glass bead parts have been well characterised for SLS [24,[26][27][28]. Cano et al [27] studied the influences of temperature and print orientation on the mechanical properties of PA12 and PA12 reinforced with glass beads, printed via SLS. They found the fracture behaviour of the PA12 composite was unaffected by the temperature or print orientation and that the fracture resistance of the composite was extremely poor in comparison to the PA12 polymer parts.…”

Section: Introductionmentioning

confidence: 99%

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Comparison between the properties of polyamide 12 and glass bead filled polyamide 12 using the multi jet fusion printing process

Connor

Dowling

2020

Additive Manufacturing

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This study investigates the material and mechanical properties of both polyamide 12 (PA12) and reinforced glass bead PA12 composites, fabricated using a production scale additive manufacturing (AM) process. The printing studies were carried out using the production scale, Multi Jet Fusion powder bed fusion process. The study demonstrated that the chemical functionality and the thermal properties of the printed PA 12 parts and the glass bead composite, were similar. Almost identical infrared spectra were obtained demonstrating the same chemical functionality. Based on DSC measurements, the melting temperature was 184°C and 186°C and the associated cooling cycle temperature was 150°C and 146°C for the composite and the PA12 respectively. The percentage crystallinity of the glass bead composite was 24 %, compared with the 31% obtained for the PA12 only parts. Based on mechanical tests, the addition of glass beads increased the tensile and flexural modulus by 85% and 36% and lowered the tensile and flexural strength by 39% and 15% respectively. The effect of print orientation during the MJF process was evaluated based on porosity and mechanical performance. Using X-ray micro computed tomography, it was demonstrated that the porosity of the PA12 and composite parts were less than 1%. Polymer and composite parts printed in the ZYX orientation were found to exhibit both the lowest porosity and highest mechanical strengths.

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Section: Mechanical Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison between the properties of polyamide 12 and glass bead filled polyamide 12 using the multi jet fusion printing process

Connor

Dowling

2020

Additive Manufacturing

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“…Prozor sinteriranja predstavlja temperaturni raspon između kristališta i tališta polimera te mora biti ~ 40 °C. 6,7 Čestice praha trebaju biti sferične ili oblika krumpira, a raspodjela veličina čestica u rasponu od 20 do 80 μm. 6 Tijekom SLS procesa dolazi do znatnih promjena u tim svojstvima, što poliamidni prah, koji nije sastavni dio objekta koji se ispisuje, čini neuporabljivim u daljnjim SLS procesima, odnosno čini ga otpadnim prahom.…”

Section: Uvodunclassified

“…6,23 Cano i sur. 7 znatno rasipanje vrijednosti prekidnog istezanja pripisuju i nehomogenosti pripremljenih uzoraka, što je također zabilježeno i u ovom radu primjenom SEM analize.…”

Section: Mehanička Svojstva Pa/tio 2 Nanokompozitaunclassified

Svojstva nanokompozita otpadnog poliamidnog praha i titanijeva dioksida

Šubarić¹,

Lončarević

Šturlić

et al. 2020

Kem. ind. (Online)

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Selektivno lasersko sinteriranje (SLS) jedan je od važnijih postupaka 3D ispisa koji se u današnje vrijeme sve više primjenjuju za dobivanje različitih modela. Najvažniji polimerni materijali koji se upotrebljavaju u tom procesu su poliamidi. Značajan nedostatak tog procesa je velika količina otpadnog polimernog praha. Stoga je cilj ovoga rada bio istražiti utjecaj dodatka nanočestica titanijeva dioksida (TiO2) na toplinska i mehanička svojstva otpadnog poliamidnog praha (PA 2200). U ovom radu pripremljeni su nanokompoziti PA/TiO2 u rasponu masenog udjela punila 1 – 5 %, postupkom zamješavanja punila u talinu polimera u gnjetilici Brabender. Aglomerati nanopunila vidljivi su na SEM mikrografiji 5 %-tnog PA/TiO2 nanokompozita. Rezultati diferencijalne pretražne kalorimetrije (DSC) ukazuju na djelovanje nanočestica TiO2 kao heterogenih nukleacijskih centara. Također, dodatak nanopunila pospješuje stvaranje stabilnijih i uređenijih kristalnih struktura poliamidne matrice. Termogravimetrijskom analizom (TGA) dokazano je da dodatak TiO2 nanopunila povećava temperaturu početka razgradnje PA matrice, to jest poboljšava toplinsku postojanost PA matrice i neznatno povećava vrijednosti toplinske vodljivosti nanokompozita u odnosu na čistu polimernu matricu. Ispitivanjem mehaničkih svojstava uzoraka uočeno je smanjenje vrijednosti sekantnog modula te neznatne promjene naprezanja i istezanja u točki popuštanja s povećanjem udjela punila u nanokompozitu.

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Selective Laser Sintering versus Multi Jet Fusion: A Comprehensive Comparison Study Based on the Properties of Glass Beads‐Reinforced Polyamide 12

Lupone,

Padovano,

Lambertini

et al. 2024

Adv Eng Mater

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Selective Laser Sintering (SLS) and Multi Jet Fusion (MJF) are the most widespread powder bed fusion additive manufacturing techniques for fabricating polymeric parts since they offer great design flexibility, productivity and geometrical accuracy. However, these technologies differ for the thermal energy source used to melt the powders as well as the innovative use of printing agents featured in the latter one to promote material consolidation and to avoid thermal bleeding at the part contours. The use of a single powder made of glass beads reinforced polyamide 12 (PA12/GB) for the fabrication of MJF and SLS samples makes possible a systematic comparison of the printed parts properties. A thoughtful analysis of the microstructure and mechanical properties of the samples revealed differences and peculiarities between the two technologies. SLS exhibited lower porosity and higher mechanical performances when the parts are printed along the build plane thanks to the powerful heating ensured by the laser. On the other hand, MJF samples show higher mechanical isotropy with great flexural and tensile behavior for vertically oriented parts. The role of glass beads in the material behaviour is defined by its mechanical properties, meaning higher rigidity and lower strength compared to neat PA12, and fracture mechanism.This article is protected by copyright. All rights reserved.

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Effect of temperature on the fracture behavior of polyamide 12 and glass-filled polyamide 12 processed by selective laser sintering

Cited by 49 publications

References 21 publications

Comparison between the properties of polyamide 12 and glass bead filled polyamide 12 using the multi jet fusion printing process

Comparison between the properties of polyamide 12 and glass bead filled polyamide 12 using the multi jet fusion printing process

Svojstva nanokompozita otpadnog poliamidnog praha i titanijeva dioksida

Selective Laser Sintering versus Multi Jet Fusion: A Comprehensive Comparison Study Based on the Properties of Glass Beads‐Reinforced Polyamide 12

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