Influence of process parameters on the interlayer bond strength of concrete elements additive manufactured by Shotcrete 3D Printing (SC3DP)

This paper investigates the effect of polypropylene (PP) fibres on the fresh and hardened properties of 3D-printed fibre-reinforced geopolymer mortars. Different percentages of PP fibres ranging between 0.25% and 1.00% by volume were added to an optimised geopolymer mixture. All samples showed reasonable workability and extrudability. In addition, shape-retention ability in the fresh state was investigated as a major requirement for 3D-printing. The compressive strength of the printed specimens was tested in the hardened state in three loading directions, viz. longitudinal, perpendicular, and lateral. The flexural strength of samples was also tested in the longitudinal and lateral directions. In addition, the interlayer bond strength was investigated. Fibre addition seems to influence compressive strengths positively only when the loading is perpendicular to the interface plane. This is due to the preferential fibre alignment parallel to the direction of extrusion. The addition of fibre significantly enhanced the flexural performance of the printed samples. The use of fibre dosages of 0.75 and 1.00 vol % caused deflection-hardening behaviour of the 3D-printed geopolymers and, hence, a significantly higher fracture energy in comparison to specimens without fibre or with lower fibre content. However, an increase in the fibre volume caused some minor reduction in interlayer bond strength. With respect to properties in the fresh state, higher fibre volumes caused better shape-retention ability in the printed samples. The results indicate the possibility of printing fibre-reinforced geopolymers which meet all the necessary properties in both the fresh and hardened states.

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Experimental Study on Three-Dimensional Microstructure Copper Electroforming Based on 3D Printing Technology

Micromachines ◽

10.3390/mi10120887 ◽

2019 ◽

Vol 10 (12) ◽

pp. 887

Author(s):

Yuanyuan Wu ◽

Shuangqing Qian ◽

Hua Zhang ◽

Yong Zhang ◽

Hongbei Cao ◽

...

Keyword(s):

3D Printing ◽

Process Parameters ◽

Current Density ◽

Three Dimensional ◽

Machining Process ◽

Optimum Process ◽

Process Conditions ◽

Influence Of Process Parameters ◽

Printing Technology ◽

3D Printing Technology

In order to fabricate three-dimensional metal microstructures, a combined machining process based on 3D printing technology and electroforming technology is proposed. Firstly, a substrate with microstructures is fabricated by 3D printing technology, and then the microstructures were fabricated by electroforming technology. The influence of process parameters such as current density, distance between electrodes and pulse current duty cycle on the electroformed layer were studied and analyzed. It was determined that the peak current density 6A/dm2, the void ratio 20%, and the distance between electrodes 40 mm were the optimum process conditions of electroforming experiment. The electroforming experiments of different microstructures were carried out with the optimum process parameters.

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Method of enhancing interlayer bond strength in construction scale 3D printing with mortar by effective bond area amplification

Materials & Design ◽

10.1016/j.matdes.2019.107684 ◽

2019 ◽

Vol 169 ◽

pp. 107684 ◽

Cited By ~ 29

Author(s):

Taylor Marchment ◽

Jay Sanjayan ◽

Ming Xia

Keyword(s):

3D Printing ◽

Bond Strength ◽

Interlayer Bond ◽

Bond Area

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Influence of Process Parameters of Printing on Mechanical Properties of Plastic Parts Produced by FDM 3D Printing Technology

MATEC Web of Conferences ◽

10.1051/matecconf/201823702014 ◽

2018 ◽

Vol 237 ◽

pp. 02014 ◽

Cited By ~ 2

Author(s):

Petr Vosynek ◽

Tomas Navrat ◽

Adela Krejbychova ◽

David Palousek

Keyword(s):

Mechanical Properties ◽

3D Printing ◽

Process Parameters ◽

Fused Deposition Modelling ◽

Anisotropic Structure ◽

Influence Of Process Parameters ◽

Printing Technology ◽

3D Printing Technology ◽

Fused Deposition ◽

Plastic Parts

Fused Deposition Modelling (FDM) is a fast-growing 3D printing technology. This technology expands rapidly even in households. Most users set print parameters only according to their own experience, regardless of the final mechanical properties. In order to predict the mechanical behaviour of the FDM-printed components, it is important to understand not only the properties of the printing material but also the effect of the printing process parameters on the mechanical properties. Components manufactured by FDM technology have an anisotropic structure, therefore the filling angle, fill shape, air gap, print orientation, and print temperature affect the resulting mechanical properties. This work deals with the change of mechanical properties depending on the setting of the filling angle, the shape of the filling, the orientation of the parts during printing, the influence of the material and pigment manufacturer.

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