Projection micro stereolithography(PμSL)has emerged as a powerful three-dimensional(3D)printing technique for manufacturing polymer structures with micron-scale high resolution at high printing speed,which enables the production of customized 3D microlattices with feature sizes down to several microns.However,the mechanical properties of as-printed polymers were not systemically studied at the relevant length scales,especially when the feature sizes step into micron/sub-micron level,limiting its reliable performance prediction in micro/nanolattice and other metamaterial applications.In this work,we demonstrate that PμSL-printed microfibers could become stronger and significantly more ductile with reduced size ranging from 20 μm to 60 μm,showing an obvious size-dependent mechanical behavior,in which the size decreases to 20 μm with a fracture strain up to～100％and fracture strength up to～100 MPa.Such size effect enables the tailoring of the material strength and stiffness of PμSL-printed microlattices over a broad range,allowing to fabricate the microlattice metamaterials with desired/tunable mechanical properties for various structural and functional applications.

Wenqiang Zhang;Haitao Ye;Xiaobin Feng;Wenzhao Zhou;Ke Cao;Maoyuan Li;Sufeng Fan;Yang Lu

Department of Mechanical Engineering,City University of Hong Kong,Kowloon,Hong Kong SAR 999077,People's Republic of China;Nano-Manufacturing Laboratory(NML),City University of Hong Kong Shenzhen Research Institute,Shenzhen 518057,People's Republic of China;Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen 518055,People's Republic of China;Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics,Wuhan University of Technology,Wuhan 430070,People's Republic of China;School of Mechano-Electronic Engineering,Xidian University,Xi'an 710071,People's Republic of China;State Key Laboratory of Materials Processing and Die&Mould Technology,School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,People's Republic of China;School of Mechanics and Safety Engineering,Zhengzhou University,Zhengzhou 450001,People's Republic of China

极端制造（英文）

[1]Wenqiang Zhang;Haitao Ye;Xiaobin Feng;Wenzhao Zhou;Ke Cao;Maoyuan Li;Sufeng Fan;Yang Lu-.Tailoring mechanical properties of PμSL 3D-printed structures via size effect)[J].极端制造（英文）,2022(04):260-268

microlattices,nanolattice,microlattice

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