Shape memory polymer (SMP) is capable of recovering its original shape from a high degree of deformation by applying an external stimulus such as thermal energy. This research presents an integration of two commercial SMP materials (DiAPLEX and Tecoflex) and a material extrusion (ME) printer to fabricate SMP parts and specimens. The material properties such as Young’s modulus of the specimens was examined as a process output. Furthermore, stress-strain curve, strain recovery, instant shape-fixity ratio, long-term shape-fixity ratio and recovery ratio of SMP specimens during a thermo-mechanical cycle were investigated.
The ME fabrication settings for the SMP specimens were defined by implementing a design of experiments with temperature, velocity and layer height as process variables.
It was found, according to main effect and iteration plots, that fabrication parameters have an impact on Young’s modulus and exist minimum iteration among variables. In addition, Young’s modulus variation of DiAPLEX and Tecoflex specimens was mostly caused by velocity and layer height parameters, respectively. Moreover, results showed that SMP specimens were able to recover high levels of deformation.
This paper is a reference for process control and for rheological properties of SMP parts produced by ME fabrication process.
This work was supported by the National Science Foundation (DUE-TUES-1246050) and (NSF-PREM DMR-1205302). Mario F. Garcia would like to acknowledge the scholarship support by the National Institute of General Medical Sciences of the National Institutes of Health (RL5GM118969), (TL4GM118971), and (UL1GM118970). Carlos A. Garcia Rosales would like to acknowledge the scholarship support by CONACYT. The authors also wish to express sincere gratitude for their financial support. The authors thank Lubrizol (Ohio, USA) for provide the material Tecoflex EG-72D.
Garcia Rosales, C., Kim, H., Garcia Duarte, M., Chavez, L., Castañeda, M., Tseng, T. and Lin, Y. (2019), "Characterization of shape memory polymer parts fabricated using material extrusion 3D printing technique", Rapid Prototyping Journal, Vol. 25 No. 2, pp. 322-331. https://doi.org/10.1108/RPJ-08-2017-0157Download as .RIS
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