Quasi-static and dynamic mechanical properties of additively manufactured Al₂O₃ ceramic lattice structures: effects of structural configuration

ABSTRACT

Ceramic lattice structures (CLSs) are promising candidates for structural applications used in conventional and extreme environments because of their extraordinary properties. Herein, CLSs with different structural configurations, including body-centred cubic (BCC), Octet, and modified body-centred cubic (MBCC), were designed and fabricated by digital light processing (DLP)-based additive manufacturing technology to explore their quasi-static and dynamic compressive behaviours. It was demonstrated that when relative density was a constant, quasi-static compressive strength (QS), quasi-static Young’s modulus (QY), and quasi-static energy absorption (QE) of CLSs with an MBCC structural configuration were the best, Octet ranked secondly, BCC was the poorest. The same thing happened on dynamic mechanical properties of CLSs. Increasing the relative density from 20% to 40% dramatically improved the QS, QY, and QE of CLSs. Furthermore, it was revealed by experiment and simulation that the quasi-static failure mode of CLSs changed from partially fracture along a specific plane to integrally fracture at most nodes as relative density increased. Furthermore, the dynamical mechanical properties of CLSs were significantly outstanding than quasi-static mechanical properties due to the strain-rate effect. This study provides a new basis for further study on tailoring the mechanical properties of CLSs.

KEYWORDS:

• Additive manufacturing
• ceramic lattice structures
• structural configuration
• quasi-static mechanical property
• dynamic mechanical property

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the National Natural Science Foundation of China under Grant [number 51772028].

Notes on contributors

Xueqin Zhang

Xueqin Zhang received her B.E. degree in Material Science and Engineering at Northeastern University. Now she is a Ph.D. candidate of the Institute of Advanced structure Technology at Beijing Institute of Technology. She mainly investigates the mechanical properties of additively manufactured ceramic lattice structures and their composites.

Keqiang Zhang

Keqiang Zhang is a Ph.D. candidate of the Institute of Advanced Structure Technology at Beijing Institute of Technology. His research interests include additive manufacturing and defect characterization of ceramics, and metamaterials.

Bin Zhang

Bin Zhang received his B.E. degree in Transportation at Chang'an University in 2018. Now he is an M.Phil candidate of the School of Naval Architecture, Ocean and Energy Power Engineering at Wuhan University Of Technology. His research interests include mechanical metamaterials and multi-functional protective materials.

Ying Li

Ying Li is a Professor and Ph.D. instructor of the Institute of Advanced structure Technology at Beijing Institute of Technology. He received his Ph.D. degree in the School of Transportation at Wuhan University of Technology in 2017. From 2018 to 2019, he was a Postdoctoral Researcher at Beijing Institute of Technology. He has won the Top Young Talents of the National Ten Thousand Talents Program and the Top Young Talents of the Chinese Association for Science and Technology. His research interests cover multi-functional protective materials, mechanical metamaterials, and additive manufacturing.

Rujie He

Rujie He is an Associate Professor and Ph.D. instructor of the Institute of Advanced structure Technology at Beijing Institute of Technology. He received his Ph.D. degree in the Center for Composite Materials and Structures at Harbin Institute of Technology in 2013. From 2013 to 2015, he worked as a Postdoctoral Researcher at Peking University. He has won the Top Young Talents of the Chinese Association for Science and Technology. His research interests focus on the additive manufacturing of ceramics and related composites.