Modeling And Evaluation Of Moisture Diffusion In Polymer Composite Materials
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| Author | : Zhen Huo |
| Publisher | : |
| Total Pages | : 118 |
| Release | : 2016 |
| Genre | : |
| ISBN | : |
"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.
| Author | : J.M.P.Q. Delgado |
| Publisher | : Springer Nature |
| Total Pages | : 109 |
| Release | : 2022-03-19 |
| Genre | : Technology & Engineering |
| ISBN | : 3030778266 |
This book provides valuable information about fiber-reinforced polymer composites, with emphasis in the process of water absorption by experiments and simulation. In this monograph, we present and discuss emerging topics related to fundamentals, engineering applications, advanced mathematical modeling applied to Fickian and non-Fickian diffusion processes, analytical and computational procedures and experiments on water absorption of polymer composites reinforced by vegetable fibers. The book serves as a comprehensive learning tool for engineers, professionals, and researchers involved in this advanced interdisciplinary field, and as a reference work for both undergraduate and graduate courses.
| Author | : Nathan Robert Roe |
| Publisher | : |
| Total Pages | : 104 |
| Release | : 2012 |
| Genre | : Composite materials |
| ISBN | : |
"Composite materials absorb moisture from the environment and over time this moisture absorption affects the mechanical performance of the material. In order to determine the long-term moisture effects on the component, representative parts must be tested after having been exposed to an accelerated moisture-conditioning environment. This accelerated environment simulates the worst-case exposure conditions that a part might experience. Currently accepted methodologies for analyzing the time required to condition specimens are limited, only allowing simple geometry and an assumption that diffusivity rates are independent of the flow path or direction. Therefore, a more advanced finite element method is desired. In the current work, a three dimensional model is developed and implemented in commercial finite element code. The parametric study is being conducted for complex shapes, moisture diffusion from any surface, and varying moisture and temperature conditions. The ultimate goal for this research is to determine exposure times for accelerated conditioning that produce the most accurate moisture distribution within the part and minimize over-conditioning of the laminate"--Abstract, leaf iii.
| Author | : Samit Roy |
| Publisher | : CRC Press |
| Total Pages | : 296 |
| Release | : 2013-09-05 |
| Genre | : Science |
| ISBN | : 1466586508 |
This book provides a better understanding of the theories associated with finite element models of elastic and viscoelastic response of polymers and polymer composites. It covers computational modeling and life-prediction of polymers and polymeric composites in aggressive environments. It begins with a review of mathematical preliminaries, equations of anisotropic elasticity, and then presents finite element analysis of viscoelasticity and the diffusion process in polymers and polymeric composites. The book provides a reference for engineers and scientists and can be used as a textbook in graduate courses.
| Author | : United States. National Bureau of Standards |
| Publisher | : |
| Total Pages | : 668 |
| Release | : 1980 |
| Genre | : Government publications |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : 668 |
| Release | : 1968 |
| Genre | : Weights and measures |
| ISBN | : |
| Author | : Sabarinathan Pushparaj Subramaniyan |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2023 |
| Genre | : |
| ISBN | : |
The central objective of my doctoral research is to shed light on the impact of internal structure on moisture-triggered degradation mechanisms across various scales. In particular, my investigation centers on the kinetics of moisture-induced degradation in two distinct polymer composites: Fiber reinforced polymer composites and Flexible syntactic foam. The initial study involved the creation of computational models using a finite element framework to assess the kinetics of moisture diffusion in impermeable fiber-reinforced polymer composites (FRPCs). The introduction of the tortuosity factor served as a means of quantifying the degree of deviation in the pathway of moisture diffusion resulting from the presence of impermeable reinforcement. Subsequently, a correlation between tortuosity and moisture diffusivity was established, paving the way for future applications of composite design and optimization. The information acquired from the preliminary investigations is leveraged to gain insights into the thermal transport characteristics driven by the moisture diffusion pathway in traditional circular fibers, as well as other fiber cross-sectional shapes such as those of the bean, bi-lobular, and triangular varieties. Finally, The impact of extended moisture exposure on the viscoelastic, thermal transport, and dielectric properties of Flexible syntactic foam has been comprehensively elucidated. This study provides valuable insights into optimizing this material at multiple scales, facilitating the attainment of desired properties.
| Author | : National Institute of Standards and Technology (U.S.) |
| Publisher | : |
| Total Pages | : 648 |
| Release | : 1980 |
| Genre | : |
| ISBN | : |
| Author | : Nasim Uddin |
| Publisher | : Elsevier |
| Total Pages | : 565 |
| Release | : 2013-05-15 |
| Genre | : Technology & Engineering |
| ISBN | : 0857098950 |
The use of fiber-reinforced polymer (FRP) composite materials has had a dramatic impact on civil engineering techniques over the past three decades. FRPs are an ideal material for structural applications where high strength-to-weight and stiffness-to-weight ratios are required. Developments in fiber-reinforced polymer (FRP) composites for civil engineering outlines the latest developments in fiber-reinforced polymer (FRP) composites and their applications in civil engineering. Part one outlines the general developments of fiber-reinforced polymer (FRP) use, reviewing recent advancements in the design and processing techniques of composite materials. Part two outlines particular types of fiber-reinforced polymers and covers their use in a wide range of civil engineering and structural applications, including their use in disaster-resistant buildings, strengthening steel structures and bridge superstructures. With its distinguished editor and international team of contributors, Developments in fiber-reinforced polymer (FRP) composites for civil engineering is an essential text for researchers and engineers in the field of civil engineering and industries such as bridge and building construction. Outlines the latest developments in fiber-reinforced polymer composites and their applications in civil engineering Reviews recent advancements in the design and processing techniques of composite materials Covers the use of particular types of fiber-reinforced polymers in a wide range of civil engineering and structural applications
| Author | : Siva P. Pilli |
| Publisher | : |
| Total Pages | : |
| Release | : 2011 |
| Genre | : |
| ISBN | : 9781267199126 |
This research also interrogates the effect of pressure on diffusion. Test chambers were built to maintain a constant relative humidity of 80% at 60 & deg;C at three different pressures (0.101 MPa, 0.517 MPa and 1.034 MPa) including a liquid water immersion test chamber at 60°C. In this study it was observed that the time to saturation increased with increasing chamber pressure. This was primarily due to the increased maximum moisture content at higher pressures. Liquid immersion of the test samples provided the upper bound for maximum moisture content and a lower bound for time to saturation. The effects of material systems and layups on humidity measurements were also studied using two different polymer composite material systems, Cycom and Toray. Diffusivity results were identical for different layups whereas differences were observed for different material systems. Finally three-dimensional numeric models were developed, using ANSYS, to compare with the measured moisture content. Models incorporating the time-dependent and 3-D diffusion have shown an improved correlation with experiments.
