Doctoral Dissertations
Keywords and Phrases
Finite Element Analysis; Mechanical Degradation; Moisture Diffusion
Abstract
"Fiber-reinforced polymer composites have extensive applications due to their high specific strength, improved product performance, low maintenance and design flexibility. However, moisture absorbed by polymer composites during the service life plays a detrimental role in both the integrity and durability of composite structure. It is essential to understand the moisture diffusion behavior and induced damage in polymer matrix composites under varying hygrothermal conditions. In Part I, the moisture diffusion characteristics in hybrid composites using moisture concentration-dependent diffusion method have been investigated. Also, a multi-stage diffusion model was proposed to explain the deviation of moisture diffusion behavior for sandwich composites from classical Fick's law using a time-dependent diffusivity scheme. User-defined subroutines were developed to implement these methods into commercial finite element code. To validate the simulation results, an open-edge moisture diffusion experiment was conducted for sandwich composites composed of woven E-glass fiber-reinforced polyurethane (PU) face sheets and a closed-cell rigid PU foam core. In Part II, the behavior of moisture diffusion and its effects on the mechanical properties of carbon/bismaleimide composites exposed to seawater conditioning at elevated temperatures were investigated. The degradation of mechanical properties due to hygrothermal aging was assessed by conducting short beam shear test and flexural test at three immersion time points. In Part III, the effect of moisture on mechanical performance of PU sandwich composites was investigated. Mechanical property degradation due to moisture absorption was evaluated by conducting compression test of the foam core, flexural test of the laminates, and double cantilever beam Mode-I interfacial fracture test of sandwich composites"--Abstract, page iv.
Advisor(s)
Chandrashekhara, K.
Committee Member(s)
Du, Xiaoping
Leu, M. C. (Ming-Chuan)
Schuman, Thomas P.
Sneed, Lesley
Department(s)
Mechanical and Aerospace Engineering
Degree Name
Ph. D. in Mechanical Engineering
Sponsor(s)
Bell Helicopter Textron, Inc.
National University Transportation Center (NUTC) at Missouri University of Science and Technology
Publisher
Missouri University of Science and Technology
Publication Date
Summer 2016
Journal article titles appearing in thesis/dissertation
- Modeling of concentration-dependent moisture diffusion in hybrid fiber-reinforced polymer composites
- Experimentation and simulation of moisture diffusion in foam-cored polyurethane sandwich structure
- Investigation of three-dimensional moisture diffusion modeling and mechanical degradation of carbon/BMI composites under seawater conditioning
- Effect of salt water exposure on foam-cored polyurethane sandwich composites
Pagination
xiii, 118 pages
Note about bibliography
Includes bibliographic references.
Rights
© 2016 Zhen Huo, All rights reserved.
Document Type
Dissertation - Open Access
File Type
text
Language
English
Thesis Number
T 11344
Electronic OCLC #
1041856285
Recommended Citation
Huo, Zhen, "Modeling and evaluation of moisture diffusion in polymer composite materials" (2016). Doctoral Dissertations. 2649.
https://scholarsmine.mst.edu/doctoral_dissertations/2649
Included in
Chemical Engineering Commons, Materials Science and Engineering Commons, Mechanical Engineering Commons