Tang, Yuxiang;
Xiao, Jianzhuang;
Ding, Tao;
Liu, Haoran;
Zhang, Mingzhong;
Zhang, Junhui;
(2024)
Trans-layer and inter-layer fracture behavior of extrusion-based 3D printed concrete under three-point bending.
Engineering Fracture Mechanics
, 296
, Article 109836. 10.1016/j.engfracmech.2023.109836.
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Abstract
This paper presents a systematic study on the effect of layer-by-layer printing process on the fracture behavior of hardened extrusion-based 3D printed concrete (3DPC). Based on three-point bending tests on center-notched beams, the fracture response of printed specimens with two fracture patterns including crack propagation across layers (trans-layer fracture) and crack propagation along layers (inter-layer fracture) was compared with that of cast specimens. The fracture mechanism of 3DPC was explored using the fracture parameters and fracture process zone (FPZ) characteristics. Experimental phenomena can be explained by the additional interlaminar cracking in FPZ of concrete introduced by the layer-by-layer stacking process. It could produce a toughening effect if cracks propagate through layers, as it is beneficial to reduce stress concentration and improve deformability. In the printing process design of 3DPC, such feature can be rationally utilized to transform the process-induced weak interfaces from inherent defects to toughening means.
| Type: | Article |
|---|---|
| Title: | Trans-layer and inter-layer fracture behavior of extrusion-based 3D printed concrete under three-point bending |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.engfracmech.2023.109836 |
| Publisher version: | http://dx.doi.org/10.1016/j.engfracmech.2023.10983... |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | 3D concrete printing, Layer orientation, Fracture behavior, Fracture process zone, Interlaminar cracking, Toughening mechanism |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10184980 |
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