Title

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

Date of Award

1-1-2019

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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