Failure Behavior and Mechanism of Vat Photopolymerization Additively Manufactured Al_(2)O_(3) Ceramic Lattice Structures  

作　　者：Keqiang Zhang Xueqin Zhang Qiaoyu Meng Bin Zhang Zhaoliang Qu Rujie He 

机构地区：[1]State Key Laboratory of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University,Beijing,100084,China [2]Institute of Advanced Structure Technology,Beijing Institute of Technology,Beijing,100081,China [3]School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan,430070,China

出　　处：《Additive Manufacturing Frontiers》2024年第4期166-177,共12页增材制造前沿(英文)

基　　金：supported by National Natural Science Foundation of China(Grant Nos.52275310,52402084);the China Postdoctoral Science Foundation(Grant No.2024M751646).

摘　　要：Vat photopolymerization additive manufacturing produces lightweight load-bearing ceramic lattice structures that have flexibility,time-efficiency,and high precision,compared to conventional technology.However,understanding the compression behavior and failure mechanism of such structures under loading remains a challenge.In this study,considering the correlation between the strut angle and bearing capacity,body-centered tetragonal(BCT)lattice structures with varying angles are designed based on a body-centered cubic(BCC)structure.BCT Al_(2)O_(3) ceramic lattice structures with varying angles are fabricated by vat photopolymerization.The mechanical properties,deformation process,and failure mechanism of the Al_(2)O_(3) ceramic lattice structures are characterized through a combination of ex-and in-situ X-ray computed tomography(X-CT)compression testing and analyzed using a finite element method(FEM)at macro-and micro-levels.The results demonstrate that as the angle increases,the stress concentration gradually expands from the node to the strut,resulting in an increased loadbearing capacity.Additionally,the failure mode of the Al_(2)O_(3) ceramic lattice structures is identified as diagonal slip shear failure.These findings provide a greater understanding of ceramic lattice structure failures and design optimization approaches.

关 键 词：Ceramic lattice structure Vat photopolymerization additive manufacturing Ex-and in-situ X-ray computed tomography(X-CT) Compression behavior Failure mechanism 

分 类 号：TQ1[化学工程]