Doctoral Dissertations

Keywords and Phrases

Additive Manufacturing; Design of Experiments; Fracture Toughness; Mechanical Behavior; Transparent Composites

Abstract

"The objective of this study is an investigation of both the characterization of fused deposition modeling (FDM) of polymer thermoplastics and the manufacture of glass-reinforced transparent composites. The flexural behavior and fracture toughness of FDM parts are critical for the evaluation and optimization of both material and process. This study focuses on the performance of FDM Ultem 1010 specimens intended to be used as composite tooling due the material's high heat resistance. A three-point bend test is performed for flexure properties while a single edge notch bend test is performed for fracture toughness. For each of the tests, the build parameters are investigated through a full-factorial design of experiments with results including flexure properties and fracture toughness properties. For flexure tests, additional tests are performed at elevated temperatures and on sparse coupons for the validation of a finite element simulation. Thermo-mechanical finite element simulation results are in good agreement with experimental findings. Transparent composite panels composed of an S-glass fabric and epoxy resin are manufactured and evaluated to introduce new materials for armor applications. The epoxy resin is synthesized from Epon 826, Epalloy 5200, and Hexahydropthalic Anhydride. To improve optical clarity, the fibers and resin are first manufactured in small samples to incrementally narrow the refractive index of the resin until matching with the glass fiber refractive index. Upon successful matching of refractive indices, a large batch of resin is synthesized to manufacture the transparent composite panels. Composite panels are manufactured with the cost-effective vacuum assisted resin transfer molding to ensure optical transparency. Currently, the proposed performance evaluation of the composite panels will involve tensile and flexure tests"--Abstract, page iv.

Advisor(s)

Chandrashekhara, K.

Committee Member(s)

Kinzel, Edward C.
Leu, M. C. (Ming-Chuan)
Schuman, Thomas P.
Yang, Xiaodong

Department(s)

Mechanical and Aerospace Engineering

Degree Name

Ph. D. in Aerospace Engineering

Sponsor(s)

Missouri University of Science and Technology. Center for Aerospace Manufacturing Technologies

Comments

This research is sponsored by the Industrial Consortium of the Center for Aerospace Manufacturing Technologies (CAMT) at Missouri University of Science and Technology.

Publisher

Missouri University of Science and Technology

Publication Date

Summer 2018

Journal article titles appearing in thesis/dissertation

  • Flexural behavior of additively manufactured Ultem 1010: Experiment and simulation
  • Fracture toughness of additively manufactured Ultem 1010
  • Mechanical and optical behavior of a continuous glass fiber-reinforced transparent composite

Pagination

xi, 67 pages

Note about bibliography

Includes bibliographic references.

Rights

© 2018 Gregory Allen Taylor, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 11726

Electronic OCLC #

1164805370

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