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Abstract

Hybrid fibre-reinforced polymer composites have extensive applications due to their high strength, cost effectiveness, improved product performance, low maintenance and design flexibility. However, moisture absorbed by composite components plays a detrimental role in both the integrity and durability of hybrid structure because it can degrade the mechanical properties and induce interfacial delamination failures. In this study, the moisture diffusion characteristics in two-phase hybrid composites using moisture concentration-dependent diffusion method have been investigated. The two phases are unidirectional S-glass fibre-reinforced epoxy matrix and unidirectional graphite fibre-reinforced epoxy matrix. In the moisture concentration-dependent diffusion method, the diffusion coefficients are not only dependent on the environmental temperature but also dependent on the nodal moisture concentration due to the internal swelling stress built during the diffusion process. A user-defined subroutine was developed to implement this method into commercial finite element code. Three-dimensional finite element models were developed to investigate the moisture diffusion in hybrid composites. A normalization approach was also integrated in the model to remove the moisture concentration discontinuity at the interface of different material components. The moisture diffusion in the three-layer hybrid composite exposed to 45℃/84% relative humidity for 70 days was simulated and validated by comparing the simulation results with experimental findings. The developed model was extended to simulate the moisture diffusion behaviour in an adhesive-bonded four-layer thick hybrid composite exposed to 45℃/84% relative humidity for 1.5 years. The results indicated that thin adhesive layers (0.12-mm thick) did not significantly affect the overall moisture uptake as compared with thick adhesive layers (0.76-mm thick).

Keywords

Moisture concentration-dependent diffusion adhesive hybrid composite finite element model

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References

Gururaja

Rao

ANH

. A review on recent applications and future prospectus of hybrid composites. Int J Soft Comput Eng 2012; 1: 352–355.

Springer

. Environmental effects on composite materials, Westport, CT: Technomic Publishing Co, 1981.

Loos

Springer

. Moisture absorption of graphite-epoxy composites immersed in liquids and in humid air. J Compos Mater 1979; 13: 131–147.

Shen

Springer

. Effects of moisture and temperature on the tensile strength of composite materials. J Compos Mater 1977; 11: 2–16.

Browning

. The mechanism of elevated temperature property losses in high performance structural epoxy resin matrix material after exposure to high humidity environments. Polym Eng Sci 1978; 18: 16–24.

Tsai

Bosze

Barjasteh

. Influence of hygrothermal environment on thermal and mechanical properties of carbon fiber/fiberglass hybrid composites. Compos Sci Technol 2009; 69: 432–437.

Bao

Yee

. Moisture diffusion and hygrothermal aging in bismaleimide matrix carbon fiber composites. II. Woven and hybrid composites. Compos Sci Technol 2002; 62: 2111–2119.

Shen

Springer

. Moisture absorption and desorption of composite materials. J Compos Mater 1976; 10: 2–20.

Loos

Springer

. Moisture absorption of polyester-E glass composites. J Compos Mater 1980; 14: 142–154.

10.

Gopalan

Rao

RMVGK

Murthy

MVV

. Diffusion studies on advanced fibre hybrid composites. J Reinforced Plast Compos 1986; 5: 51–61.

11.

Gurtin

Yatomi

. On a model for two phase diffusion in composite materials. J Compos Mater 1979; 13: 126–130.

12.

Weitsman

. Coupled damage and moisture-transport in fiber-reinforced, polymeric composites. Int J Solids Struct 1987; 23: 1003–1025.

13.

Whitney JM and Browning CE. Some anomalies associated with moisture diffusion in epoxy matrix composite materials. Advanced Composite Materials-Environmental Effects. ASTM STP 658. West Conshohocken, PA, USA: American Society for Testing and Materials, 1978, pp.43–60.

14.

Gillat O and Broutman LJ. Effect of an external stress on moisture diffusion and degradation in a graphite-reinforced epoxy laminate. In: Vinson JR (ed) Advanced Composite Materials-Environmental Effects, ASTM STP 658. West Conshohocken, PA, USA: American Society for Testing and Materials, 1978, pp.61–83.

15.

Wan

Wang

Huang

. Hygrothermal aging behaviour of VARTMed three-dimensional braided carbon-epoxy composites under external stresses. Compos Part A: Appl Sci Manufact 2005; 36: 1102–1109.

16.

Crank

. A theoretical investigation of the influence of molecular relaxation and internal stress on diffusion in polymers. J Polym Sci 1953; 11: 151–168.

17.

Roe N, Huo Z, Chandrashekhara K, et al. Advanced moisture modeling of polymer composites. J Reinforced Plast Compos 2013; 32(7): 437–449.

18.

Galloway

Miles

. Moisture absorption and desorption predictions for plastic ball grid array packages. IEEE Trans Compon Packag Manufact Technol Part A 1997; 20: 274–279.

19.

Wong EH, Teo YC, and Lim TB. Moisture Diffusion and vapour pressure modeling of IC packaging. In: Proceedings of the 48th Electronic Components and Technology Conference, Seattle, WA, 25–28 May 1998, pp.1372–1378.

20.

Zaffaroni G. Two-dimensional moisture diffusion in hybrid composite components. In: Gates TS and Zureick A (eds) High Temperature and Environmental Effects on Polymeric Composites. ASTM STP 1302. West Conshohocken, PA, USA: American Society for Testing and Materials, 1997. pp.97–109.

21.

Cappelletti

Rivolta

Zaffaroni

. Environmental effects on mechanical properties of thick composite structural elements. J Compos Technol Res 1995; 17: 107–114.

22.

Renzo

. Advanced Composite Materials: Products and Manufacturers, Park Ridge, NJ: Noyes Data Corp, 1988.

23.

Deiasi RJ and Schulte RL. Experimental Determination of the Effects of Moisture on Composite-to-Composite Adhesive Joints. NASA-CR-3387, 1981, pp.1–63.

Modelling of concentration-dependent moisture diffusion in hybrid fibre-reinforced polymer composites

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