Development of an in-process reinforcement method in 3d concrete printing with nitinol shape memory alloy
DOI:
https://doi.org/10.20868/ade.2023.5373Keywords:
3DCP, Reinforcement, SMA, Nitinol, Additive manufacturingAbstract
Concept of digital fabrication in construction industry, refers to the process of constructing structures by robots with cementitious materials. To increase in tensile strength of concrete as the main material in 3D concrete printing (3DCP), reinforcement the structures with a second material is necessary. Reinforcement in 3DCP is done in three ways: pre-installed reinforcement, in-process reinforcement, and post-installed Reinforcement method. In the in-process reinforcement method where reinforcement is done during printing, is one of the challenges which many researchers try to work on and present a practical method. One of the in-process reinforcement methods which was proposed by researchers in this area of knowledge, is “U-nails insertion”, where U-shape reinforcement materials are embedded into fresh printed layers during printing automatically, and layers will be connected by these u-nails. In this study, a software simulation was done by authors in Abaqus finite-element software. Nitinol SMA was proposed as the reinforcement material and the samples with SMA U-nails were modelled and three-point bending test was simulated in the software to see the effect of using new material in the mentioned reinforcement method. A sample without reinforcement material was modelled, too, to have a control sample and finally results with different reinforcement materials were compared.
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