Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 93, Issue -, Pages 486-497Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2015.05.132
Keywords
3D printing; Cementitious material; Layered structure; Automatic construction; Stress-strain relationship; Maximum stress criterion; Anisotropic structure
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Funding
- National Natural Science Foundation of China [51278276]
- National Basic Research Program of China (973 Program) [2012CB026200]
- Beijing Higher Education Young Elite Teacher Project [YETP0078]
- Tsinghua University Initiative Scientific Research Program [20111081015]
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The three dimensional (3D) printing technology has undergone rapid development in the last few years and it is now possible to print engineering structures. This paper presents a study of the mechanical behavior of 3D printed structures using cementitious powder. Microscopic observation reveals that the 3D printed products have a layered orthotropic microstructure, in which each layer consists of parallel strips. Compression and flexural tests were conducted to determine the mechanical propertiesand failure characteristics of such materials. The test results confirmed that the 3D printed structures are laminated with apparent orthotropy. Based on the experimental results, a stress-strain relationship and a failure criterion based on the maximum stress criterion for orthotropic materials are proposed for the structures of 3D printed material. Finally, a finite element analysis was conducted for a 3D printed shell structure, which shows that the printing direction has a significant influence on the load bearing capacity of the structure. (C) 2015 Elsevier Ltd. All rights reserved.
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