Journal
ENGINEERING
Volume 15, Issue -, Pages 133-142Publisher
ELSEVIER
DOI: 10.1016/j.eng.2021.03.032
Keywords
Laser 3D printing; Laser powder bed fusion; Compression-induced twisting-compliant; mechanism Compression-torsion property; Mechanical properties
Categories
Funding
- National Natural Science Foundation of China [U1930207, 51735005, 51905269]
- Basic Strengthening Program [2019-JCJQ-JJ-331]
- 15th Batch of Six Talents PeaksInnovative Talents Team Program [TD-GDZB-001]
- National Natural Science Foundation of China for Creative Research Groups [51921003]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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The study investigated the effects of LPBF printing parameters on the formability and compressive properties of the laserprinted CIT-compliant mechanism. Results showed that increasing laser power led to the elimination of residual metallurgical pores and improved dimensional accuracy and surface roughness. The deformation behavior of the LPBF-fabricated CIT mechanism exhibited four typical stages, with a deformation capacity of up to 20% before fracturing.
and constraint topology (FACT) method and manufactured by means of laser powder bed fusion (LPBF). The effects of LPBF printing parameters on the formability and compressive properties of the laserprinted CIT-compliant mechanism were studied. Within the range of optimized laser powers from 375 to 450 W and with the densification level of the samples maintained at above 98%, changes in the obtained relative densities of the LPBF-fabricated CIT-compliant mechanism with the applied laser powers were not apparent. Increased laser power led to the elimination of residual metallurgical pores within the inclined struts of the CIT mechanism. The highest dimensional accuracy of 0.2% and the lowest surface roughness of 20 lm were achieved at a laser power of 450 W. The deformation behavior of the CIT-compliant mechanism fabricated by means of LPBF exhibited four typical stages: an elastic stage, a heterogeneous plastic deformation stage, a strength-destroying stage, and a deformation-destroying stage (or instable deformation stage). The accumulated compressive strain of the optimally printed CIT mechanism using a laser power of 450 W went up to 20% before fracturing, demonstrating a large deformation capacity. The twisting behavior and mechanical properties were investigated via a combination of finite-element simulation and experimental verification. An approximately linear relationship between the axial compressive strain and rotation angle was achieved before the strain reached 15% for the LPBF-processed CIT-compliant mechanism. (c) 2022 THE AUTHORS. Published by Elsevier LTD on behalf of Chinese Academy of Engineering and Higher Education Press Limited Company. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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