Systematic analysis of the mechanical anisotropy of fibre-reinforced polymer specimens produced by laser sintering
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In: Additive Manufacturing, Vol. 36.2020, No. December, 101671, 17.10.2020.
Research output: Contribution to journal › Article › Research › peer-review
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TY - JOUR
T1 - Systematic analysis of the mechanical anisotropy of fibre-reinforced polymer specimens produced by laser sintering
AU - Khudiakova, A.
AU - Berer, M.
AU - Niedermair, S.
AU - Plank, B.
AU - Truszkiewicz, E.
AU - Meier, G.
AU - Stepanovsky, H.
AU - Wolfahrt, M.
AU - Pinter, G.
AU - Lackner, J.
PY - 2020/10/17
Y1 - 2020/10/17
N2 - Selective laser sintering (SLS) is an additive manufacturing process which nowadays receives abundant attention from industry sectors. However, the number of materials which can be processed by SLS is still very limited and requires further research. The present work aims to contribute to this topic by investigating the mechanical properties of neat and short carbon fibre reinforced polyamide 1212 processed by SLS. The specimens were built in different spatial alignments to obtain ample details on the tensile behaviour. The detailed examinations of the fractured specimens were performed by means of optical microscopy, scanning electron microscopy and X-ray computed tomography. The comprehensive analysis revealed that most of the fibres (85 – 95%) were oriented in the plane of the powder layer and here, the majority along the direction of the moving roller coater, which distributes the powder on the powder bed of the SLS machine. It was shown that this effect has a direct impact on the strength and stiffness of the printed tensile bars and thus on the mechanical behaviour of SLS printed parts. Furthermore, the analysis results indicate the possibility to control this mechanical anisotropy through a sys-tematic alignment of the components in the powder cake.
AB - Selective laser sintering (SLS) is an additive manufacturing process which nowadays receives abundant attention from industry sectors. However, the number of materials which can be processed by SLS is still very limited and requires further research. The present work aims to contribute to this topic by investigating the mechanical properties of neat and short carbon fibre reinforced polyamide 1212 processed by SLS. The specimens were built in different spatial alignments to obtain ample details on the tensile behaviour. The detailed examinations of the fractured specimens were performed by means of optical microscopy, scanning electron microscopy and X-ray computed tomography. The comprehensive analysis revealed that most of the fibres (85 – 95%) were oriented in the plane of the powder layer and here, the majority along the direction of the moving roller coater, which distributes the powder on the powder bed of the SLS machine. It was shown that this effect has a direct impact on the strength and stiffness of the printed tensile bars and thus on the mechanical behaviour of SLS printed parts. Furthermore, the analysis results indicate the possibility to control this mechanical anisotropy through a sys-tematic alignment of the components in the powder cake.
KW - Fibre orientation
KW - Polyamide
KW - Selective laser sintering
KW - Short carbon fibre composites
KW - X-ray computed tomography
UR - http://www.scopus.com/inward/record.url?scp=85095603418&partnerID=8YFLogxK
U2 - 10.1016/j.addma.2020.101671
DO - 10.1016/j.addma.2020.101671
M3 - Article
AN - SCOPUS:85095603418
VL - 36.2020
JO - Additive Manufacturing
JF - Additive Manufacturing
SN - 2214-8604
IS - December
M1 - 101671
ER -
