Journal
POLYMER TESTING
Volume 86, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymertesting.2020.106357
Keywords
PA12; SLS; Additive manufacturing; Three network model; Lattice structures
Funding
- Abu Dhabi National Oil Company (ANDOC) [EX2016-000001]
- Khalifa University of Science and Technology [CIRA-2018-128]
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This study is focused on multiscale characterization and constitutive parameters identification of selectively laser sintered PA12 specimens. The process parameters and change in crystallinity due to 3D printing were identified via differential scanning calorimetry (DSC). Tension, compression, shear, flexural and fracture tests performed on samples fabricated, both in 0 degrees and 90 degrees directions reveal that the tensile toughness of samples printed in 0 degrees orientation, outperform samples printed in 90 degrees orientation by an average of 24%. Cryogenically fractured samples were analyzed via SEM and micro-computed tomography to analyze 2D/3D defects and correlate the microstructure with macroscopic properties. The constitutive parameters for a strain-rate and temperature-dependent Three Network (TN) material model were identified using the measured mechanical properties. Furthermore, mechanical response of micro-architected Kelvin lattice structure was analyzed by Finite Element Method employing the TN constitutive model and the predictions were corroborated with measurements.
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