TY - JOUR
T1 - Development of conformal shell lattices via laser powder bed fusion and unraveling their mechanical responses via modeling and experiments
AU - Fu, Jin
AU - Ding, Junhao
AU - Zhang, Lei
AU - Qu, Shuo
AU - Song, Xu
AU - Fu, M. W.
N1 - Funding Information:
The authors would like to thank GRF Projects of 15228621 and 15229922, and the Projects ZE1W and 1-CD4H from The Hong Kong Polytechnic University. SONG Xu would like to acknowledge the financial support from the project #RNE-p2–21 of the Shun Hing Institute of Advanced Engineering, The Chinese University of Hong Kong.
Funding Information:
The authors would like to thank GRF Projects of 15228621 and 15229922 , and the Projects ZE1W and 1-CD4H from The Hong Kong Polytechnic University . SONG Xu would like to acknowledge the financial support from the project # RNE-p2–21 of the Shun Hing Institute of Advanced Engineering, The Chinese University of Hong Kong .
Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2023/1/25
Y1 - 2023/1/25
N2 - Additive manufacturing offers new design opportunities in employing lattice structures for lightweight applications. Especially, conformal lattice design can be made with internal lattice core with freeform external geometry. However, the mechanical response of conformal lattices is not well understood. In this work, triply periodic minimal surface (TPMS) based conformal shell lattices were designed based on isoparametric transformation method and fabricated by laser powder bed fusion (LPBF) to study the influence of key design factors on the mechanical properties of the conformal shell lattices. The results show that the deformation mechanism and mechanical properties of the shape-transformed structures are highly influenced by design factors including shape transformation type, tilting angle of side walls and cell orientation. The boundary between the misaligned shape-transformed TPMS does not deteriorate the mechanical properties and the energy absorption capability. Finally, conformal TPMS-filled monoclastic lattice was studied to verify the effectiveness of the conformal design for mechanical applications. It is found that the conformal TPMS-filled monoclastic lattice shows better mechanical performance than the uniformly in-filled counterparts. This work provides the first quantitative correlation between the design factors and the mechanical properties of the shape-transformed structures and highlights the potential of TPMS-based conformal design for real-world lightweight applications.
AB - Additive manufacturing offers new design opportunities in employing lattice structures for lightweight applications. Especially, conformal lattice design can be made with internal lattice core with freeform external geometry. However, the mechanical response of conformal lattices is not well understood. In this work, triply periodic minimal surface (TPMS) based conformal shell lattices were designed based on isoparametric transformation method and fabricated by laser powder bed fusion (LPBF) to study the influence of key design factors on the mechanical properties of the conformal shell lattices. The results show that the deformation mechanism and mechanical properties of the shape-transformed structures are highly influenced by design factors including shape transformation type, tilting angle of side walls and cell orientation. The boundary between the misaligned shape-transformed TPMS does not deteriorate the mechanical properties and the energy absorption capability. Finally, conformal TPMS-filled monoclastic lattice was studied to verify the effectiveness of the conformal design for mechanical applications. It is found that the conformal TPMS-filled monoclastic lattice shows better mechanical performance than the uniformly in-filled counterparts. This work provides the first quantitative correlation between the design factors and the mechanical properties of the shape-transformed structures and highlights the potential of TPMS-based conformal design for real-world lightweight applications.
KW - Conformal shell lattices
KW - Isoparametric transformation
KW - Laser powder bed fusion
KW - Mechanical response
KW - Triply periodic minimal surface
UR - http://www.scopus.com/inward/record.url?scp=85146099627&partnerID=8YFLogxK
U2 - 10.1016/j.addma.2023.103406
DO - 10.1016/j.addma.2023.103406
M3 - Journal article
AN - SCOPUS:85146099627
SN - 2214-8604
VL - 62
JO - Additive Manufacturing
JF - Additive Manufacturing
M1 - 103406
ER -