The idea of fiber commingling is proposed to increase compressive strengths and the effect of fiber commingling is evaluated by considering two different failure models, buckling failure and shear failure. Micro-buckling failure theory is extended to account for the nonlinear effects of the fiber and matrix by using Ramberg-Osgood stress-strain relations and the tangential modulus concept. In the case of shear failure, a more appropriate method to estimate the shear strength of each component is proposed. The effect of fiber commingling can be estimated from the controlling mode.
1. Dow, N. F. and I. J. Gruntfest. 1960. "Determination of Most Needed Potentially Possible Improvements in Materials for Ballistic and Space Vehicles,"General Electrical Company, Space Sciences Laboratory, TISR6OSD389.
2.
2. Rosen, B. W.1965. "Mechanics of Composite Strengthening,"Fiber Composite Materials. Metals Park, Ohio: American Society for Metals, pp. 37-75.
3.
3. Dow, N. F. and Rosen, B. W.1965. "Evaluations of Filament-Reinforced Composites for Aerospace Structural Applications," NASA CR-207.
4.
4. Schuerch, H.1966"Prediction of Compressive Strength in Uniaxial Boron-Metal Matrix Composite Materials,"ALIA J., 4:102-106.
5.
5. Hahn, H. T. and J. G. Williams. 1986"Compression Failure Mechanisms in Unidirectional Composites,"Composite Materials: Testing and Design, ASTM STP893, pp. 115-139.
6.
6. Yeh, J. R. and J. L. Teply. 1988. "Compressive Response of Kevlar/Epoxy Composites,"Journal of Composite Materials, 22:245-257.
7.
7. Foye, R. L.1966. "Compression Strength of Unidirectional Composites," ALAA Paper No. 66-143.
8.
8. Ewins, P. D. and A. C. Ham. 1973. "The Nature of Compressive Failure in Unidirectional Carbon Fiber Reinforced Plastics," Royal Aircraft Establishment Technical Report 73057
9.
9. Tsai, S. W. and H. T. Hahn. 1980. Introduction to Composite Materials, Lancaster, PA: Technomic Publishing.
10.
10. Greszczuk, L. B. 1982. "On Failure Modes of Unidirectional Composites under Compressive Loading,"Fracture of Composite Materials, Proceedings of the 2nd USA-USSR Symposium, pp. 231-244.
