Effects of scan direction and orientation on mechanical properties of laser sintered polyamide-12

Nelson, Jack A. and Galloway, Gregory and Rennie, Allan and Abram, Tom and Bennett, Graham R. (2014) Effects of scan direction and orientation on mechanical properties of laser sintered polyamide-12. International Journal of Advanced Design and Manufacturing Technology, 7 (3). pp. 19-25. ISSN 2252-0406

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Abstract

In order to understand the impact of layer-wise scanning direction in the Selective Laser Sintering process, test coupons were manufactured for mechanical testing from DuraForm™ Polyamide powder. The effects of laser energy density, varying between 0.003 and 0.024 J/mm2 were examined in test specimens rotated 90º through the Z axis. SLS machines do not always facilitate ‘cross-hatching’ of layers and therefore orientation has a major influence on part quality. When employed, the cross-hatching technique scans successive layers perpendicularly to the previous. Studying how parts perform with scan lines in a common direction, will assist in the understanding of how SLS parts behave in practice. Results showed that physical density, tensile strength and elongation rose with energy density up to 0.012 J/mm². This initial rise was due to a continued improvement in particle fusion with increasing energy density. Above 0.012 J/mm², these properties started to decline at different rates depending on their orientation (scan direction) on the part bed. Specimen’s oriented perpendicularly to the X axis exhibited a greater elongation at the expense of tensile strength, when compared to parallel specimens.

Item Type:
Journal Article
Journal or Publication Title:
International Journal of Advanced Design and Manufacturing Technology
Additional Information:
This journal provides immediate open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge.
Subjects:
ID Code:
70445
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Deposited On:
19 Aug 2014 08:28
Refereed?:
Yes
Published?:
Published
Last Modified:
14 Jul 2020 04:06