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Toughness-based recovery efficiency of shape memory parts fabricated using material extrusion 3D printing technique

Carlos Alejandro Garcia Rosales (Department of Electronics and Communication Engineering, University of Texas at El Paso, El Paso, Texas, USA)
Hoejin Kim (Department of Mechanical Engineering, University of Texas at El Paso, El Paso, Texas, USA)
Mario F. Garcia Duarte (Department of Mechanical Engineering, University of Texas at El Paso, El Paso, Texas, USA)
Luis Chavez (Department of Mechanical Engineering, University of Texas at El Paso, El Paso, Texas, USA)
Tzu-Liang Bill Tseng (Department of Industrial, Manufacturing and Systems Engineering, University of Texas at El Paso, El Paso, Texas, USA)
Yirong Lin (Department of Mechanical Engineering, The University of Texas at El Paso, El Paso, Texas, USA)

Rapid Prototyping Journal

ISSN: 1355-2546

Article publication date: 6 November 2018

Issue publication date: 21 January 2019

298

Abstract

Purpose

Shape memory polymers (SMPs) are classified as smart materials owing to their inherent stimulus-induced response. SMPs are capable of recovering partially or totally to its original shape after a high degree of deformation by external stimulus. The most used stimuli are thermal, light, magnetic field and electricity. This research aims to characterize the toughness property of thermo-responsive SMP specimens fabricated by the material extrusion (ME) process and to investigate the impact of ME parameters on specimen maximum load and load-displacement curves. Moreover, to investigate the recovery efficiency based on the initial and post toughness generated by the compact tension test.

Design/methodology/approach

A design of experiments with three parameters (temperature, velocity and layer height) defined the ME settings to fabricate the specimens. The ME raster orientation factor was also evaluated separately. In addition, one more specimen group assisted by a clamp during the recovery process was compared with a specimen control group. After fabrication, specimens were submitted to a thermo-mechanical cycle that encompasses a compact tension test and a thermo-recovery process. Comparison studies of load-displacement, toughness and recovery efficiency of the specimens were carried out to determine the optimized fabrication parameters.

Findings

It was found that ME parameters and raster orientation impacted the test results. Samples with the clamp support during recovery returned a higher toughness than samples without support. Finally, results showed that the shape memory effect can contribute with up to 43 per cent recovery efficiency in a first recovery and up to 23 per cent in a second recovery of damaged specimens.

Originality/value

This paper is a reference for toughness and recovery properties of SMP parts produced by the ME fabrication process.

Keywords

Citation

Garcia Rosales, C.A., Kim, H., Garcia Duarte, M.F., Chavez, L., Tseng, T.-L.B. and Lin, Y. (2019), "Toughness-based recovery efficiency of shape memory parts fabricated using material extrusion 3D printing technique", Rapid Prototyping Journal, Vol. 25 No. 1, pp. 30-37. https://doi.org/10.1108/RPJ-09-2017-0188

Publisher

:

Emerald Publishing Limited

Copyright © 2018, Emerald Publishing Limited

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