材料科学
断裂(地质)
复合材料
弯曲
图层(电子)
挤压
增韧
断裂力学
开裂
三点弯曲试验
断裂韧性
抗弯强度
堆积
压力(语言学)
韧性
语言学
哲学
物理
核磁共振
作者
Yuxiang Tang,Jianzhuang Xiao,Tao Ding,Haoran Liu,Mingzhong Zhang,Junhui Zhang
标识
DOI:10.1016/j.engfracmech.2023.109836
摘要
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.
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