Effect of Saline Immersion and Freeze-Thaw Cycles on Performance of Fused Deposition Modelling (FDM) Materials

Date of Award

2019

Degree Name

Ph.D. in Mechanical Engineering

Department

Department of Mechanical and Aerospace Engineering and Renewable and Clean Energy

Advisor/Chair

Advisor: Thomas Whitney

Abstract

Fused Deposition Modeling (FDM) is an increasingly common form of additive manufacturing in a growing number of engineering applications. FDM's layer-wise method of depositing material can produce complex three-dimensional parts which could not be produced by other "subtractive" methods. ABS-M30 is an Acrylonitrile Butadiene Styrene (ABS) resin which resists expansion, bending, impact and environmental effects for long periods. It has excellent heat / cold resistance and chemical resistance. ABS play a major role in the rise and growth of three-dimensional printing. ABS parts are readily available in the desired shape and effect. ABS-M30 is being increasingly used in elevated temperature and humidity conditions, and in applications which expose the material to salt-water environments. The behavior of ABS-M30 under these conditions has not been well established. The objective of this study was to evaluate the effects of exposure to cyclic temperature/salt-water environments, including freeze-thaw conditions, on the tensile and shear performance of FDM ABS-M30. Various FDM coupons fabricated with rasters in the 0░, 90░,45░ directions, respectively, were exposed to fixed cycles of elevated temperature and humidity; salt water immersion; and freeze-thaw cycles. The effects of these exposures on tensile strength, elongation, and strain-to-failure; and shear strength, displacement, and strain-to-failure, were assessed. In addition, a simulation by finite elements analysis on the effect of expansion and shrinkage of water (due to thermal expansion from -20░ to 40░C) in the natural voids of FDM materials, was performed. Results were correlated to changes observed in the mechanical testing.

Keywords

Mechanical Engineering, FUSED DEPOSITION MODELLING, SALINE IMMERSION, FREEZE-THAW CYCLES, ABS-H30

Rights Statement

Copyright © 2019, author

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