Fatigue behaviour study on repaired aramid fiber/epoxy composites

Botelho, Edson Cocchieri; Mazur, Rogério Lago; Costa, Michelle Leali; Cândido, Geraldo Maurício; Rezende, Mirabel Cerqueira

doi:10.5028/jatm.2009.0102217221

Abstract:

Aramid fiber reinforced polymer composites have been used in a wide variety of applications, such as aerospace, marine, sporting equipment and in the defense sector, due to their outstanding properties at low density. The most widely adopted procedure to investigate the repair of composites has been by repairing damages simulated in composite specimens. This work presents the structural repair influence on tensile and fatigue properties of a typical aramid fiber/epoxy composite used in the aerospace industry. According to this work, the aramid/epoxy composites with and without repair present tensile strength values of 618 and 680MPa, respectively, and tensile modulus of 26.5 and 30.1 GPa, respectively. Therefore, the fatigue results show that in loads higher than 170 MPa, both composites present a low life cycle (lower than 200,000 cycles) and the repaired aramid/epoxy composite presented low fatigue resistance in low and high cycle when compared with non-repaired composite. With these results, it is possible to observe a decrease of the measured mechanical properties of the repaired composites.

Keywords:
Fatigue behavior; Aramid/epoxy composite; Structural composites; Mechanical behavior

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REFERENCES

ABARIS, 1998, "Training Advanced Composite Structures: Fabrication and Damage Repair", Abaris Training Resources Inc.
ANNUAL AMERICAN STANDARD TEST METHODS, 1985, "ASTM-D 3039-76: Standard Test Method for Tensile Properties of Fiber-Resin Composites", Philadelphia, PA.
ANNUAL AMERICAN STANDARD TEST METHODS, 1985, "ASTM-D 3479: Standard Test Method for Fatigue of Fiber-Resin Composites", Philadelphia, PA.
Ashcroft, I.A., et al., 2001, "The Effect of Environment on the Fatigue of Bonded Composite Joints. Part 1: Testing and fractography", Composites, Part A, Nº. 32, pp. 45-58.
Botelho, E. C., Nogueira, C. L., Rezende, M. C., 2002, "Monitoring of Nylon 6.6/Carbon Fiber Processing by X Ray Diffraction and thermal Analysis", Journal of Applied Polymer Science, Nº. 86, pp. 3114-3121.
Botelho, E.C., Lauke, B., Figiel, L., Rezende, M.C., 2003, "Mechanical Behavior of Carbon Fiber-Reinforced Polyamide Composites", Science and Technology, Nº. 63, pp.1843-1855.
Botelho, E. C., Pardini, L.C., Costa, M.L., Rezende, M.C., 2005, "Hygrothermal Effects on Viscoelastic Behavior of Glass Fiber/Epoxy Composites", Journal of Materials Science, Nº. 40, pp. 3615-3623.
Botelho, E. C., Pardini, L. C., Rezende, M. C., 2005, "Hygrothermal Effects on Metal/Glass Fiber/Epoxy Hybrid Composites", Materials Science & Engineering, Nº. 399, pp. 190-198.
Cerny, M., Glogar, P., Manocha, L.M., 2000, "Resonant Frequency Study of Tensile and Shear Elasticity Moduli of Carbon Fiber Reinforced Composites - CFRC", Carbon, Nº. 38, pp. 2139-2149.
Ganczakowski, H. L., Beaumont, P. W. R., 1989, "The Behavior of Kevlar Fibre-Epoxy Laminates under Static and Fadigue Loadings Part I - Experimental", Composites Science and Technology, Vol.36 , Nº. 4, pp. 345-354.
Gregory, J.R., Spearing, S.M., 2005, "Constituent and Composite Quasi-Static and Fatigue Fracture Experiments", Composites - Part A, Nº. 36, pp. 665-674.
Kawai, M., Yajima, S., Hachinohe, A., Kawase, Y., 2001, "High-Temperature off-axis Fatigue Behavior of Unidirectional Carbon-Fibre Reinforced Composites with Different Resin Matrices", Composites Science and Technology, Nº. 61, pp. 1285-1302.
Roudet, F., Desplanques, Y., Degallaix ,S., 2002, "Fatigue of Glass/Epoxy Composite in Three-point-bending with Predominant Shering", International Journal of Fatigue, Nº. 24, pp. 327-337.

Publication Dates

Publication in this collection
Jul-Dec 2009

History

Received
19 May 2009
Accepted
28 Sept 2009

This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

[1] ABARIS, 1998, "Training Advanced Composite Structures: Fabrication and Damage Repair", Abaris Training Resources Inc.

[2] ANNUAL AMERICAN STANDARD TEST METHODS, 1985, "ASTM-D 3039-76: Standard Test Method for Tensile Properties of Fiber-Resin Composites", Philadelphia, PA.

[3] ANNUAL AMERICAN STANDARD TEST METHODS, 1985, "ASTM-D 3479: Standard Test Method for Fatigue of Fiber-Resin Composites", Philadelphia, PA.

[4] Ashcroft, I.A., et al., 2001, "The Effect of Environment on the Fatigue of Bonded Composite Joints. Part 1: Testing and fractography", Composites, Part A, Nº. 32, pp. 45-58.

[5] Botelho, E. C., Nogueira, C. L., Rezende, M. C., 2002, "Monitoring of Nylon 6.6/Carbon Fiber Processing by X Ray Diffraction and thermal Analysis", Journal of Applied Polymer Science, Nº. 86, pp. 3114-3121.

[6] Botelho, E.C., Lauke, B., Figiel, L., Rezende, M.C., 2003, "Mechanical Behavior of Carbon Fiber-Reinforced Polyamide Composites", Science and Technology, Nº. 63, pp.1843-1855.

[7] Botelho, E. C., Pardini, L.C., Costa, M.L., Rezende, M.C., 2005, "Hygrothermal Effects on Viscoelastic Behavior of Glass Fiber/Epoxy Composites", Journal of Materials Science, Nº. 40, pp. 3615-3623.

[8] Botelho, E. C., Pardini, L. C., Rezende, M. C., 2005, "Hygrothermal Effects on Metal/Glass Fiber/Epoxy Hybrid Composites", Materials Science & Engineering, Nº. 399, pp. 190-198.

[9] Cerny, M., Glogar, P., Manocha, L.M., 2000, "Resonant Frequency Study of Tensile and Shear Elasticity Moduli of Carbon Fiber Reinforced Composites - CFRC", Carbon, Nº. 38, pp. 2139-2149.

[10] Ganczakowski, H. L., Beaumont, P. W. R., 1989, "The Behavior of Kevlar Fibre-Epoxy Laminates under Static and Fadigue Loadings Part I - Experimental", Composites Science and Technology, Vol.36 , Nº. 4, pp. 345-354.

[11] Gregory, J.R., Spearing, S.M., 2005, "Constituent and Composite Quasi-Static and Fatigue Fracture Experiments", Composites - Part A, Nº. 36, pp. 665-674.

[12] Kawai, M., Yajima, S., Hachinohe, A., Kawase, Y., 2001, "High-Temperature off-axis Fatigue Behavior of Unidirectional Carbon-Fibre Reinforced Composites with Different Resin Matrices", Composites Science and Technology, Nº. 61, pp. 1285-1302.

[13] Roudet, F., Desplanques, Y., Degallaix ,S., 2002, "Fatigue of Glass/Epoxy Composite in Three-point-bending with Predominant Shering", International Journal of Fatigue, Nº. 24, pp. 327-337.

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