Moisture Diffusion in Fiber Reinforced Plastics

1976 ◽  
Vol 98 (1) ◽  
pp. 92-95 ◽  
Author(s):  
E. L. McKague ◽  
J. D. Reynolds ◽  
J. E. Halkias
Keyword(s):  
Relative Humidity ◽  
Material Properties ◽  
Nonlinear Diffusion ◽  
Moisture Absorption ◽  
Moisture Diffusion ◽  
Fiber Reinforced ◽  
Diffusion Behavior ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Diffusion Rates

Fiber-reinforced epoxy laminates were exposed to several combinations of temperature and relative humidity. The purpose was to determine rates and extent of moisture absorption. Diffusion rates varied with temperature, and equilibrium moisture contents varied with relative humidity. Data analysis provided values for the material properties that determined diffusion behavior. A nonlinear diffusion model containing these values was shown to describe and predict absorption behavior for any combination of temperature and humidity. The model also describes desorption and correlates well with experimental data from changing humidity conditions.

scholarly journals The Effects of Weathering on Mechanical Properties of Glass Fiber Reinforced Plastics (Grp) Materials

1970 ◽  
Vol 1 (2) ◽  
Author(s):  
H. Abdullah ◽  
S. Al Araimi and R. A. Siddiqui
Keyword(s):  
Mechanical Properties ◽  
Relative Humidity ◽  
Ultraviolet Radiation ◽  
Glass Fiber ◽  
Exposure Time ◽  
Atmospheric Conditions ◽  
Fiber Reinforced ◽  
Reinforced Plastics ◽  
Glass Fiber Reinforced ◽  
Fiber Reinforced Plastics

Glass fiber reinforced plastics composite is extensively used as a structural material for pools, oil pipes and tanks because it has good corrosion resistance properties.  The effects of weathering on the mechanical properties of glass fiber reinforced plastics (GRP) in the Sultanate of Oman have been studied.  The tensile and three point bend specimens were exposed to outdoor conditions (open atmosphere) in sunlight and tested for various intervals of time.  It was observed that as the exposure time to sunlight, ultraviolet radiation and dust increases the mechanical properties of GRP materials decrease.  The effects of relative humidity (%RH) on the mechanical properties were also studied. It was found that as the relative humidity increased in the atmosphere during the exposure time, the tensile strength, flexural strength and modulus of elasticity are lowered. This work has revealed that the decrease in the mechanical properties of GRP under weathering conditions is subjected to atmospheric conditions such as humidity, temperature, ultraviolet radiation and pollutant.Key Words: Weathering, Glass-Fiber Reinforced Plastics, Degradation

Integrative Simulation für faserverstärkte Bauteile/Integrative simulation for fiber-reinforced components

2021 ◽  
Vol 111 (01-02) ◽  
pp. 49-51
Author(s):  
Heiko Andrä ◽  
Hannes Grimm-Strele ◽  
Matthias Kabel ◽  
Jonathan Köbler ◽  
Dariusz Niedziela ◽  
...  
Keyword(s):  
Production Process ◽  
Material Properties ◽  
Mass Production ◽  
Weight Ratio ◽  
Simulation Method ◽  
Multiscale Simulation ◽  
Fiber Reinforced ◽  
Production Scale ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics

Faserverstärkte Kunststoffe spielen im Leichtbau eine große Rolle. Gründe hierfür sind das gute Gewicht-Steifigkeitsverhältnis sowie die kosteneffizienten und massenproduktionstauglichen Fertigungsverfahren. Für die Entwicklung und Auslegung von kurz- und langfaserverstärkten Bauteilen haben wir eine integrierte skalenübergreifende Simulationskette entwickelt, die den Fertigungsprozess und die daraus erzeugten Materialeigenschaften automatisch berücksichtigt.   Fiber reinforced plastics have a high stiffness to weight ratio and can be cost efficiently produced on a mass production scale by injection or compression molding. Therefore, this type of material plays an important role for producing lightweight components. We developed an integrative multiscale simulation method for the dimensioning of short and long fiber reinforced components, which takes into account the production process as well as the resulting locally varying material properties.

Einsatz von CFK-Fräspartikeln als Füllstoff*/Application of CFRP milling particles as filler - Examinations on the material behavior of fiber-reinforced injection molded parts

2017 ◽  
Vol 107 (07-08) ◽  
pp. 558-563
Author(s):  
E. Prof. Uhlmann ◽  
P. Meier
Keyword(s):  
Material Properties ◽  
Material Behavior ◽  
Fiber Bundles ◽  
Filler Material ◽  
Fiber Reinforced ◽  
Reinforced Plastics ◽  
Global Demand ◽  
Molded Parts ◽  
Injection Molded ◽  
Fiber Reinforced Plastics

Der globale Bedarf an faserverstärkten Kunststoffen (CFK) wächst aufgrund seiner herausragenden Eigenschaften gegenüber konventionellen Leichtbauwerkstoffen in der Automobil- sowie Luft- und Raumfahrtbranche stetig an. Für deren Endbearbeitung kommen überwiegend Fräsprozesse zum Einsatz, welche Verschnitt in Form von Faserbündeln im Mikrobereich erzeugen. Ein vielversprechender Ansatz die Ressourceneffizienz zu erhöhen, ist der Einsatz der Fräspartikel als Füllmaterial in Thermoplasten.   Due to the outstanding material properties of fiber reinforced plastics towards conventional lightweight materials, its global demand in the automotive and the aeronautical sector is growing steadily. For the machining of final contours, milling processes are mainly utilized, which create chips in form of fiber bundles in the micro range. A promising approach to increase the resource efficiency is the use of the milling particles as filler material in thermoplastic materials.

scholarly journals Experimentally and analyzed property of carbon fiber reinforced thermoplastic and thermoset plates

2018 ◽  
Vol 7 (3) ◽  
pp. 12 ◽  
Author(s):  
Mitsuhiro Okayasu ◽  
Yuki Tsuchiya ◽  
Hiroaki Arai
Keyword(s):  
Carbon Fiber ◽  
Material Properties ◽  
Polyphenylene Sulfide ◽  
Fatigue Properties ◽  
Fiber Reinforced ◽  
Reinforced Plastics ◽  
Thermoset Resin ◽  
Polyether Ether Ketone ◽  
Fiber Reinforced Plastics ◽  
Carbon Fiber Reinforced

The tensile and fatigue properties of long unidirectional (UD) and crossply (CR) carbon fiber reinforced plastics (CFRPs) were investigated. The CFRPs in this study were fabricated from 60% CF and various resins: epoxy, polyamide (PA6), polyphenylene sulfide (PPS), and polyether ether ketone (PEEK). The ultimate tensile strength sUTS of Epoxy-CFRP was found to be about twice that of PEEK-CFRP. Relatively high tensile strengths were found for PPS- and PA6-CFRP in the thermoset resin group, although these were still only about 85% of the strength of epoxy-CFRP. The tensile and fatigue strengths of the CR-CFRPs were less than half those of the UD-CFRPs, even though high ductilities were found for the CR-CFRPs. These high ductilities can be attributed to the crosslinking fiber effect and the low proportion of CFs in the loading direction. The sUTS values of CFRPs depend not only on the tensile strengths s and volume fractions V of CF and resin (i.e., through the conventional compound law sUTS = sfiberVfiber + sresinVresin), but also on several material properties, including the wettability of the CF by the resin. On the basis of the material properties, the ultimate tensile strengths of various UD- and CR-CFRPs were well estimated numerically through a statistical analysis, which afforded better estimates than those obtained from the compound law.

scholarly journals Predictions of Moisture Diffusion Behavior of Cellulose-Fiber-Reinforced Plain Weave Epoxy Composites

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2347
Author(s):  
Hang Yu ◽  
Jie Yang
Keyword(s):  
Moisture Absorption ◽  
Cellulose Fiber ◽  
Moisture Diffusion ◽  
Diffusion Problem ◽  
Fiber Bundles ◽  
Superposition Method ◽  
Fiber Reinforced ◽  
Element Analysis ◽  
Diffusion Behavior ◽  
Plain Weave

Cellulose-fiber-reinforced plain weave composites absorb lots of water from humid environments because of their inherent susceptibility to moisture. Moisture absorption experiments with cellulose fiber plain weave composites have been reported by some researchers; however, few theoretical studies have been performed to date to predict their moisture diffusion behavior. In this paper, the moisture diffusion behavior of cellulose-fiber-reinforced plain weave composite is predicted using a novel superposition method considering its microweave pattern. The overall moisture uptake of the composite is treated as moisture absorption superposition of the fiber bundles part, resin part, undulated fiber bundles and resin-rich part in the unit cell. The moisture diffusion of the undulated fiber bundles and resin-rich part is more complicated than the other parts; thus, a solution for a unique three-phase diffusion problem is used to solve this special moisture diffusion issue. Both finite element analysis and experiments are carried out to validate the proposed approach, with the results showing that the predictions can effectively characterize the moisture diffusion behavior of cellulose-fiber-reinforced plain weave composites.

Moisture diffusion in glass-fiber-reinforced plastics after their climatic aging

2014 ◽  
Vol 456 (1) ◽  
pp. 77-81 ◽  
Author(s):  
L. T. Startseva ◽  
S. V. Panin ◽  
O. V. Startsev ◽  
A. S. Krotov
Keyword(s):  
Glass Fiber ◽  
Moisture Diffusion ◽  
Fiber Reinforced ◽  
Reinforced Plastics ◽  
Glass Fiber Reinforced ◽  
Fiber Reinforced Plastics
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