An Oblique Fiber Bundle Test and Analysis

Abstract

Although it is widely known to textile scientists that when yarn twist exceeds the optimal level, yam strength will decline due to the so-called obliquity effect, the exact physical mechanism behind this obliquity effect is still unknown. It is therefore our objective to investigate this issue. We adopt a special technique for tensile sample preparation in which parallel fibers are adhered to a transparent adhesive tape. The angle between the fiber direction and the loading direction can therefore be altered so that the mechanical behavior of the fibers at different loading angles can be observed. The effects of different loading angles on the strengths and breaking strains of the specimens are recorded, thus shedding light on the physics of the obliquity effect.

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References

Agarwal, B. , and Broutman, L.J. , "Analysis and Performance of Fiber Composites," 2nd ed., John Wiley & Sons, Inc., NY, 1990, p. 174.

Chang, B.W. , Huang, P.H. , and Smith, D.G. , A Pinned-end Figure for Off-axis Testing, Exp. Tech. (6), 28 (1984).

Hearle, J.W.S. , Grosberg, P. , and Backer, S. , "Structural Mechanics of Fibers, Yarns, and Fabrics," vol. I John Wiley & Sons, Inc., NY , 1969, pp. 232, 242.

Pipes, R.B. , and Cole, B.W. , On the Off-axis Strength Test for Anisotropic Materials, J. Composite Mater. 7, 246 ( 1973).

Richards, G.L. , Airhart, T.P. , and Ashton, J.E. , Off-axis Tensile Coupon Testing, J. Composite Mater. 3, 586 (1969).

Sun, C.T. , and Chung, I. , An Oblique End-tab Design for Testing Off-axis Composite Specimens , Composites 24, 619 ( 1993).

Sun, C.T. , and Berreth, S.P. , A New End Tab Design for Off-axis Tension Test of Composite Materials , J. Composite Mater. 3, 766 (1988).

Wang, X. , Zhang, Y. , Postle, R. , and Pan, N. , An Experimental Examination on the Strength of Wool and Wool Reinforcement , in "Proc. 2nd China International Textile Conference ," Xian China, 1998, p. 277.