Journal
RAPID PROTOTYPING JOURNAL
Volume 25, Issue 2, Pages 322-331Publisher
EMERALD GROUP PUBLISHING LTD
DOI: 10.1108/RPJ-08-2017-0157
Keywords
4D printing; Shape memory polymer; Design of experiments; Material extrusion
Funding
- National Science Foundation [DUE-TUES-1246050, NSF-PREM DMR-1205302]
- National Institute of General Medical Sciences of the National Institutes of Health [RL5GM118969, TL4GM118971, UL1GM118970]
- CONACYT
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1205302] Funding Source: National Science Foundation
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Purpose 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. Design/methodology/approach 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. Findings 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. Originality/value This paper is a reference for process control and for rheological properties of SMP parts produced by ME fabrication process.
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