Journal
COMPOSITE STRUCTURES
Volume 225, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2019.111192
Keywords
3D printed composites; Lattice structure; Glass fiber/PA12 composite; Digital image correlation; Selective laser sintering
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Funding
- National Natural Science Foundation of China [11872025, 11672279]
- Jiangsu Province Science Foundation for Youths [BK20170518, BK20180878]
- Natural Science Foundation of Colleges and Universities in Jiangsu Province [18KJB560004]
- China Postdoctoral Science Foundation [2019 M650501]
- Postgraduate Innovation Plan of Jiangsu Province [KYCX18_2220]
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In this paper, the mechanical properties and failure modes of 3D printed fiber-reinforced polyamide 12 (PA12) composite lattice structures were studied using digital image correlation (DIC). First, the fiber-reinforced PA12 composite tensile samples and lattice structures were prepared by selective laser sintering (SLS). Then the tensile experiments were carried out on the tensile samples, and the tensile strength and elastic modulus were obtained. Moreover, the compressive experiments were carried out on the 3D printed PA12 composite lattice structures. The full field displacements and strains were obtained using DIC, and the failure position and failure mode can be captured from the strain fields. The repetitive energy absorption property of the lattice structures was comparative analyzed between the 3D printed PA12 composite lattice structures with and without fiber-reinforcements. The experimental results show that the tensile strength and elastic modulus of the 3D printed PA12 composites with fiber-reinforcements are higher than that without fiber-reinforcements. The compressive strength of the 3D printed PA12 composite lattice structures with fiber-reinforcements are lower than that without fiber-reinforcements, but the repetitive energy absorption property of the 3D printed PA12 composites lattice structures with fiber-reinforcements are more stable than that without fiber-reinforcements.
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