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Article

Experimental Study on Improving the Mechanical Properties of Material Extrusion Rapid Prototyping Polylactic Acid Parts by Applied Vibration

1
School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China
2
Key Laboratory of Dynamics and Reliability of Mechanical Equipment of Liaoning Province, Northeastern University, Shenyang 110819, China
3
Department of Cultural Foundation, Liaoning Guidaojiaotong Polytechnic Institute, Shenyang 110023, China
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College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
*
Author to whom correspondence should be addressed.
Academic Editor: Paolo Fino
Appl. Sci. 2021, 11(4), 1820; https://doi.org/10.3390/app11041820
Received: 1 December 2020 / Revised: 3 February 2021 / Accepted: 3 February 2021 / Published: 18 February 2021
Due to the stratified nature of the manufacturing process, material extrusion (ME) parts have lower mechanical properties than those fabricated by traditional technology. This is one of the most significant defects hindering the development and application of this rapid prototyping technique. In this paper, vibration was applied to the ME process by using piezoelectric ceramics for the first time to improve the mechanical properties of the built parts. The vibrating ME equipment was established, and the specimens processed in different build directions were individually fabricated without applied vibration and with different applied vibrations. To quantify the effect of applied vibration on their mechanical properties and to summarize the influencing rule, a series of experimental tests were then performed on these specimens. A comparison between the testing results shows that the tensile strength and plasticity of the specimens, especially those processed in the Z direction, can be obviously improved by applied vibration. The orthogonal anisotropy is decreased obviously. The improvement becomes greater with increasing vibration frequency or amplitude. From the microscopic point of view, it can be seen that applied vibration can reduce the part’s defects of porosity and inclusion as well as separation between layers and, thereby, improve the bonding strength. View Full-Text
Keywords: material extrusion; mechanical property; piezoelectric ceramics; applied vibration; experimental test material extrusion; mechanical property; piezoelectric ceramics; applied vibration; experimental test
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MDPI and ACS Style

Jiang, S.; Dong, T.; Zhan, Y.; Dai, W.; Zhan, M. Experimental Study on Improving the Mechanical Properties of Material Extrusion Rapid Prototyping Polylactic Acid Parts by Applied Vibration. Appl. Sci. 2021, 11, 1820. https://doi.org/10.3390/app11041820

AMA Style

Jiang S, Dong T, Zhan Y, Dai W, Zhan M. Experimental Study on Improving the Mechanical Properties of Material Extrusion Rapid Prototyping Polylactic Acid Parts by Applied Vibration. Applied Sciences. 2021; 11(4):1820. https://doi.org/10.3390/app11041820

Chicago/Turabian Style

Jiang, Shijie, Tiankuo Dong, Yang Zhan, Weibing Dai, and Ming Zhan. 2021. "Experimental Study on Improving the Mechanical Properties of Material Extrusion Rapid Prototyping Polylactic Acid Parts by Applied Vibration" Applied Sciences 11, no. 4: 1820. https://doi.org/10.3390/app11041820

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