Surface Texture, Fatigue, and the Reduction in Stiffness of Fiber Reinforced Plastics

[+] Author and Article Information
D. Arola, C. L. Williams

Department of Mechanical Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250

J. Eng. Mater. Technol 124(2), 160-166 (Mar 26, 2002) (7 pages) doi:10.1115/1.1416479 History: Received January 12, 2001; Revised July 20, 2001; Online March 26, 2002
Copyright © 2002 by ASME
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Four-point flexure apparatus mounted within the MTS grips
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Identification of the Gr/Bmi laminate flexural response from experiments and finite element modeling. (a) Confirmation of critical bend loads from quasi-static bending; (b) determination of flexure loads for flexural fatigue loading from the FEM.
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Surface texture and profile valley radii of the AWJ machined Gr/Bmi laminate. (a) Surface profile with 2 μm Ra; (b) surface profile with 10 μm Ra; (c) profile valley radius from (a); (d) profile valley radius from (b).
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Change in the bend load load-line displacement resulting from fully reversed flexure fatigue of a Gr/Bmi specimen. AWJ specimen (Ra=2 μm) tested with Tsai Hill Ratio of 0.9. (a) N=1,000 cycles; (b) N=60,000 cycles.
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Reduction in stiffness of the Gr/Bmi laminate resulting from fully reversed flexural fatigue loading. Error bars indicate the standard deviation. (a) Reduction in stiffness with flexural loading at F=0.75; (b) reduction in stiffness with flexural loading at F=0.90.
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Weibull probability distribution of the Gr/Bmi fatigue life for a 15% reduction in stiffness resulting from fully reversed flexural fatigue (Tsai Hill ratio of 0.75). (a) Distribution of ADS specimens (Ra=0.2 μm;) (b) distribution of AWJ B specimens (Ra=10 μm).
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Damage of the transverse plies resulting from fatigue loading of the Gr/Bmi laminate. (a) Matrix cracking in a transverse ply (X860); (b) fiber matrix debonding (X3000).
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Apparent fatigue stress concentration factors for the Gr/Bmi laminates estimated over the cyclic load history (Kf(N)). (a) Fully reversed fatigue with F=0.75; (b) fully reversed fatigue with F=0.90.




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