Theoretical Assessment of Stress Analysis in Short Fiber Composites

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An investigation of composite mechanics to investigate stress transfer mechanism accurately, a modification of the conventional shear lag model was attempted by taking fiber end effects into account in discontinuous composite materials. It was found that the major shortcoming of conventional shear lag theory is not being able to provide sufficiently accurate strengthening predictions in elastic regime when the fiber aspect ratio is very small. The reason is due to its neglect of stress transfer across the fiber ends and the stress concentrations that exist in the matrix regions near the fiber ends. To overcome this shortcoming, a more simplified shear lag model introducing the stress concentration factor which is a function of several variables, such as the modulus ratio, the fiber volume fraction, the fiber aspect ratio, is proposed. It is found that the modulus ratio is the most essential parameter among them. Thus, the stress concentration factor is expressed as a function of modulus ratio in the derivation. It is also found that the proposed model gives a good agreement with finite element results and has the capability to correctly predict the variations of the internal quanitities.

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Periodical:

Key Engineering Materials (Volumes 261-263)

Edited by:

Kikuo Kishimoto, Masanori Kikuchi, Tetsuo Shoji and Masumi Saka

Pages:

1421-1426

Citation:

H. G. Kim et al., "Theoretical Assessment of Stress Analysis in Short Fiber Composites", Key Engineering Materials, Vols. 261-263, pp. 1421-1426, 2004

Online since:

April 2004

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$38.00

[1] Agarwal, B. D. and Broutman, L. J., "Analysis and performance of Fiber Composites, Johns Wiley and Sons, New York, pp.71-104, (1980).

[2] Agarwal, B.D., Lifsitz, J. M., and Broudtman, L. J., Elastic-Plastic Element Analysis of Short Fiber Composites, Fiber Science and Technology, Vol. 7, pp.45-62, (1974).

[3] Cox, H. L., The Elasticity and Strength of Paper and Other Fibrous Materials, British Jounal of Applied Physics, Vol. 3, pp.72-79, (1952).

[4] Kim, H. G., Stress Transfer in shear Deformable Discontinous Composites, KSME Jounal, Vol. 8, No. 4, pp.475-484, (1994).

[5] Nardone, V. C. and Prewo, K. M., On the Strength of Discontiuous Silicon Carbide Reinforced Aluminum Composites, Scripta Metallurgica Vol. 20, pp.43-48, (1986).

DOI: https://doi.org/10.1016/0036-9748(86)90210-3

[6] Nardone, V. C., Assessment of Models used to Predict the Strength of Discontinuous Silicon Carbide Reinforced Alumium Alloys, Scripta Metallurgia, Vol. 21, pp.1313-1318, (1987).

DOI: https://doi.org/10.1016/0036-9748(87)90105-0

[7] Taya, M., and Arsenault, R. J., A Comparison between a Shear Lag Type Model and an Eshelby Type Model in Predicting the Mechanical Properties of Short Fiber Composite, Scripta Metallurgica, Vol. 21, pp.349-354, (1987).

DOI: https://doi.org/10.1016/0036-9748(87)90227-4

[8] Kim, H. G, Analytical Study on the Elastic-Plastic Transition in Short Fiber Reinforced Composites, KSME International Journal, Vol. 12, No. 2, pp.257-266, (1998).

DOI: https://doi.org/10.1007/bf02947170

[9] Kim, H. G. and Chang, I., "Analysis of the Strengthening Mechanism Based on Stress-Strain Hysteresis Loop in Short Fiber Reinforced Metal Matrix Composites�, KSME International Journal, Vol. 9, No. 2, pp.197-208, (1995).

DOI: https://doi.org/10.1007/bf02953621

[10] Piggot, M. R., Load Bearing Fiber Composite, Pergamon Press, p.83, (1980).

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