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Mechanical Properties of Extrusion-Based Additive Manufacturing of Shape Memory Polymers

  • Author / Creator
    Zonoobi, Danesh
  • Extrusion-Based Additive Manufacturing (EBAM), also known as Fused Deposition Modeling (FDM) or three-dimensional (3D) printing, is a manufacturing technique in which a desired object is formed by repetitive process of extrusion and deposition of thin layers of molten material through a nozzle in different paths in a selective manner. Availability of low cost EBAM devices plus versatility of materials that can be manufactured by EBAM lead to exponential growth of EBAM in numerous applications. Among the materials that can be used in EBAM, shape memory polymers (SMPs) are in spotlight due to their unique ability to return from a deformed state to their original shape with an external stimulus. Manufacturing of SMP objects through an EBAM process, also known as four dimensional (4D) printing, has a great potential for different applications; however, mechanical properties of SMP end-products manufactured by EBAM need to be thoroughly analyzed before any functional application can be developed.This thesis investigates and reports the mechanical properties of SMP end-products manufactured by EBAM. The effects of major printing parameters (print orientation and infill percentage) on five mechanical properties, namely, elastic modulus, yield strength, maximum elongation, resilience and toughness are investigated.Additionally, an analytical model based on Classical Laminated Plate Theory (CLPT) was used in order to predict the elastic modulus of EBAM parts. Predicted results of the model are compared with the experimental results. Due to the poor agreement between predicted and experimental data in some cases, a modified model is developed that matches the experimental results with less than 5% difference.

  • Subjects / Keywords
  • Graduation date
    2019-06
  • Type of Item
    Thesis
  • Degree
    Master of Science
  • DOI
    https://doi.org/10.7939/r3-eq6a-qe05
  • License
    Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.