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Showing 1 to 20 of 32 for “"moisture diffusion"”.
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Moisture diffusion through vinyl ester/clay nanocomposites
Moisture diffusion was studied through vinyl ester samples containing up to 5 wt% montmorillonite clay; two different kinds of clay surface treatments were employed to make the clay compatible with the vinyl ester resin. These nanocomposites were characterized using differential scanning …
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Evaluation of Moisture Diffusion Theories in Porous Materials
Moisture transport in building materials is directly responsible for structural damage, as well as poor indoor air quality. For these reasons, the need to understand transfer mechanisms and predict moisture transport through building materials has increased over the last couple of decades. Although …
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A theoretical and experimental investigation of moisture diffusion in wood
In this paper, the application of the diffusion equation to the problem of moisture movement below the fiber saturation point is investigated. The general diffusion equation was solved by numerical methods for the case of a concentration-dependent coefficient and a boundary condition of a specified …
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Moisture diffusion through neat and glass-fiber reinforced vinyl ester resin containing nanoclay
Moisture diffusion was studied through neat resin as well as glass-fiber reinforced vinyl ester samples, both containing up to 5 wt% montmorillonite clay. Transient and steady-state diffusion experiments were carried out with both neat resin as well as glass-fiber reinforced samples. Effect of …
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Measurements and modeling of moisture diffusion processes in transformer insulation using interdigital dielectrometry sensors
The presence of moisture in a transformer deteriorates the transformer insulation by decreasing its electrical, mechanical, and thermal strength. Therefore, it is important to monitor the moisture condition in both liquid and solid insulation to assure transformer performance. There are …
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Dielectrometry measurements of moisture diffusion and temperature dynamics in oil impregnated paper insulated electric power cables
… accelerate cable aging: temperature stresses, moisture ingress, and partial discharge. The research focuses on the effect of temperature and moisture on the effective (complex) permittivity of the cable insulation. Measurements are performed using cylindrical dielectrometry sensors designed to …
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A finite element analysis of adhesively bonded composite joints including geometric nonlinearity, nonlinear viscoelasticity, moisture diffusion and delayed failure
… sorption is accounted for by a nonlinear Fickean diffusion model in which the diffusion coefficient is dependent on the penetrant concentration and the dilatational strain. A delayed failure criterion based on the Reiner-Weisenberg failure theory has also been implemented in the finite element …
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Buried Pipe Life Prediction in Sewage Type Environments
… during service with environmental effects, a moisture diffusion model, and a lifetime prediction analysis combining the above models has been constructed. The model uses an elasticity solution for axial-symmetric loading in the case of pressurized pipe, and an approximate non-linear solution …
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An experimental and theoretical investigation of the migration of moisture in cocoa beans
… essentially an investigation of non-convective moisture movement as the result of a temperature gradient in hygroscopic porous materials, in particular, cocoa beans. The aim of the research has been to determine experimentally the bulk moisture diffusion coefficient for cocoa, and, by …
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Moisture transfer in porous materials exposed to combined humidity and temperature gradients
Moisture migration is responsible for much damage in modern buildings. Air infiltrations were almost eliminated because of the use of various qualities of materials and insulation. Water is mainly transferred through building materials by diffusion, under three different phases (vapor, liquid and …
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Thermally Induced Vibration of a Cross-Ply Laminated Plate with Hygrothermal Effects (Exact Solution)
… structure under elevated temperature and moisture conditions. An exact solution is formulated which describes the hygrothermal effects due to heating and moisture diffusion on one surface of a symmetric cross-ply plate made of AS/3501 graphite epoxy with simply-supported boundary …
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Cross-Laminated Timber made of Unmodified and Thermally Modified Yellow-Poplar Lumber
… ranging from dry indoor environments to moisture-prone settings. Thermally modified wood (TMW) is a potential solution to enhance CLT's moisture durability and reduce moisture-related issues. Yellow-poplar (YP), abundant in the Appalachian region, is a promising raw material due to its …
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Crash Analysis of Degraded Concrete Containment Structures
… effect shrinkage, creep, heat transfer, moisture diffusion, and Alkali-Silica Reaction (ASR). Long-term creep and shrinkage of vertical dry cask are modeled using the B4 creep formulation for concrete. The results show that creep and shrinkage does not significantly affect the performance …
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Estimation of land surface water and energy balance flux components and closure relation using conditional sampling
… balance include numerical treatment of heat and moisture diffusion in the soil-vegetation-atmosphere continuum. These two diffusion and exchange processes are linked only at a few critical points. The performance and sensitivity of models are highly dependent on the nature of these linkages that …
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Moisture properties of self-levelling flooring compounds
… has so far been published concerning their moisture properties. This report focuses on moisture properties of SLC and describes methods for determining them. Moisture properties of materials are important for the calculation of drying times and moisture loads and for prediction of ion …
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Peridynamics For The Solution Of Multiphysics Problems
… equations for mechanical deformation, thermal diffusion, moisture diffusion, electric potential distribution, porous flow and atomic diffusion in either an uncoupled or a coupled manner. It is a nonlocal theory with an internal length parameter. Therefore, it can capture physical phenomenon for …
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Space-Time Multiscale-Multiphysics Homogenization Methods for Heterogeneous Materials
… of the research a mathematical model for coupled moisture diffusion-mechanical deformation is developed. This model is integrated with the spatial homogenization framework to analyze problems consisting of multiple length scales and coupled-multiple physics. The unified multiscale-multiphysics …
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Moisture degradation in FRP bonded concrete systems : an interface fracture approach
… the mechanistic debonding behavior affected by moisture. Results have shown that moisture affected debonding is a highly complex phenomenon that involves physical changes in the bond as well as in its constituent materials. In particular, moisture can initially enhance or reduce the interface …
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Water vapor diffusion through glass fiber reinforced polymer nanocomposites
… material. Clay not only acts as a barrier toward moisture diffusion, it also sequesters the moisture and protects the glass surface. During the course of this study the role of nano and micro fillers such as Montmorillonite clay, carbon nanotubes and Kevlar(TM) pulp in decreasing the diffusion …
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