Hygroscopic aspects of epoxy/carbon fiber composite laminates in aircraft environments

Choi, Heung Soap; Ahn, K. J.; Nam, Jae Do; Chun, Hye‐Yeong

doi:10.1016/s1359-835x(00)00145-7

Cited by 179 publications

(113 citation statements)

References 24 publications

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“…Depression in T g is related to the hygrothermal history. 25 The amount of the bound water in a system is reported to be proportional to the depression in T g . 26,27 The sorbed moisture depresses the T g by plasticizing the polymer network, thus affecting the mechanical performance and durability.…”

Section: Free Water and Bound Watermentioning

confidence: 99%

Effect of moisture‐ingress on adhesion energy in a metal oxide‐polymer system

Devasahayam

2005

J of Applied Polymer Sci

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This work quantifies the damage caused by moisture in a metal coating system under extreme weathering conditions, using Variable Radius Roll Adhesion Test (VaRRAT). Interfacial toughness (adhesion energy) between the metal oxide and the polymer in painted steel panels, studied by using VaRRAT, is observed to fall with increasing temperature and time of exposure to moisture. Possible cause for irreversible loss in adhesion energy in the paint system is attributed to the sorption of free water at the metal oxide-polymer interface. Different failure responses were observed in two different paint-metal systems. Adsorption or diffusion in the Henry's mode is rate controlling in green paints as indicated by the low activation energy of 12 kJ mol Ϫ1 . The white samples showed a high activation energy of 30 kJ mol Ϫ1 , indicating a mixed process of diffusion as well as chemical to be rate determining. Different paint/ binder ratios are responsible for the different responses of these samples.

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Section: Free Water and Bound Watermentioning

confidence: 99%

Effect of moisture‐ingress on adhesion energy in a metal oxide‐polymer system

Devasahayam

2005

J of Applied Polymer Sci

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“…The advantage of using prepreg is its tight relation between reinforcement and polymeric matrix (usually 60:40 (v:v)), respectively, for thermoset prepregs) attending several requirements for manufacturing structural composite components 1,4,[9][10][11] . Another important advantage presented by the prepregs is that this intermediate material is available as tape or fabric, which allows to adjust the reinforcement positioning, tickness, layer number and orientation in the molding, according to the mechanical efforts that the final component will be submitted.…”

Section: Introductionmentioning

confidence: 99%

Comparison of tensile strength of different carbon fabric reinforced epoxy composites

2006

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Carbon fabric/epoxy composites are materials used in aeronautical industry to manufacture several components as flaps, aileron, landing-gear doors and others. To evaluate these materials become important to know their mechanical properties, for example, the tensile strength. Tensile tests are usually performed in aeronautical industry to determinate tensile property data for material specifications, quality assurance and structural analysis. For this work, it was manufactured four different laminate families (F155/PW, F155/HS, F584/PW and F584/HS) using pre-impregnated materials (prepregs) based on F155 TM and F584 TM epoxy resins reinforced with carbon fiber fabric styles Plain Weave (PW) and Eight Harness Satin (8HS). The matrix F155TM code is an epoxy resin type DGEBA (diglycidil ether of bisphenol A) that contains a curing agent and the F584 TM code is a modified epoxy resin type. The laminates were obtained by handing lay-up process following an appropriate curing cycle in autoclave. The samples were evaluated by tensile tests according to the ASTM D3039. The F584/PW laminates presented the highest values of tensile strength. However, the highest modulus results were determined for the 8HS composite laminates. The correlation of these results emphasizes the importance of the adequate combination of the polymeric matrix and the reinforcement arrangement in the structural composite manufacture. The microscopic analyses of the tested specimens show valid failure modes for composites used in aeronautical industry.

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“…The epoxy can undergo plasticization and hydrolysis, which cause reversible and irreversible changes in the polymer structure. Due to these processes both the modulus and glass transition temperature are lowered [12][13][14][15][16][17]. Furthermore, matrix-dominated properties such as compressive strength, interlaminar shear strength, fatigue and impact tolerance can also deteriorate [12,15,16,18,19].…”

Section: Introduction Cmentioning

confidence: 99%

Degradation of Carbon Fiber-Reinforced Epoxy Composites by Ultraviolet Radiation and Condensation

Kumar

Singh

Nakamura

2002

Journal of Composite Materials

264

176

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ABSTRACT:The degradation of an IM7/997 carbon fiber-reinforced epoxy exposed to ultraviolet radiation and/or condensation has been characterized. Based on observations of physical and chemical degradation it has been established that these environments operate in a synergistic manner that causes extensive erosion of the epoxy matrix, resulting in a reduction in mechanical properties. Matrix dominated properties are affected the most, with the transverse tensile strength decreasing by 29% after only 1000 h of cyclic exposure to UV radiation and condensation. While, the longitudinal fiber-dominated properties are not affected for the exposure durations investigated, it has been noted that extensive matrix erosion would ultimately limit effective load transfer to the reinforcing fibers and lead to the deterioration of mechanical properties even along the fiber dominated material direction.

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Hygroscopic aspects of epoxy/carbon fiber composite laminates in aircraft environments

Cited by 179 publications

References 24 publications

Effect of moisture‐ingress on adhesion energy in a metal oxide‐polymer system

Effect of moisture‐ingress on adhesion energy in a metal oxide‐polymer system

Comparison of tensile strength of different carbon fabric reinforced epoxy composites

Degradation of Carbon Fiber-Reinforced Epoxy Composites by Ultraviolet Radiation and Condensation

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