Composites single-fiber

Qiu, Y. and Schwartz, P. (1991). A new method for study of the fiber-matrix interface in composites Single fiber pull-out from a microcomposite. J. Adhesion Sci. Technol. 5, 741-756. 

Vautey, P. and Favre, J.P. (1990). Fiber/matrix load transfer in thermoset and thermoplastic composites-single fiber models and hole sensitivity of laminates. Composites Sci. Technol. 38, 271-288. 

In the single fiber pull out test (SFPO), a small portion of the fiber is embedded in the bulky matrix and the interfacial strength is calculated from the peak load when the fiber is pulled out of the composite. 

Anisotropic materials have different properties in different directions (1-7). 1-Aamples include fibers, wood, oriented amorphous polymers, injection-molded specimens, fiber-filled composites, single crystals, and crystalline polymers in which the crystalline phase is not randomly oriented. Thus anisotropic materials are really much more common than isotropic ones. But if the anisotropy is small, it is often neglected with possible serious consequences. Anisoiropic materials have far more than two independent clastic moduli— generally, a minimum of five or six. The exact number of independent moduli depends on the symmetry in the system (1-7). Anisotropic materials will also have different contractions in different directions and hence a set of Poisson s ratios rather than one. 

This change in scale and interaction regimes would form the basis to differentiate spinning from fibril growth. This is particularly a propos from a materials point of view, where a multifibrillar composition offers a mechanical advantage over a single fiber of the same cross-sectional area (Putthanarat et al., 2000). 

Yavin, B., Gallis, H. E Scherf, J., Eitan, A. and Wagner, H. D., Continuous monitoring of the fragmentation phenomenon in single fiber composite materials, Polym. Composites, 12, 436 (1991). 

Qian H, Bismarck A, Greenhalgh ES, Shaffer MSP. Carbon nanotube grafted silica fibers Characterising the interface at the single fiber level. Composites Science and Technology. 

In view of the fact that the above techniques examine single fibers embedded in a matrix block, application of the experimental measurements to practical fiber composites may be limited to those with small fiber volume fractions where any effects of interactions between neighboring fibers can be completely neglected. To relate the interface properties with the gross performance of real composites, the effects of the fiber volume fraction have to be taken into account. To accommodate this important issue, a modified version of the fiber pull-out test, the so-called microbundle pull-out test, has been developed recently by Schwartz and coworkers (Qui and Schwartz, 1991, 1993 Stumpf and Schwartz, 1993 Sastry et al., 1993). In... 

The microindentation technique (or push-out test as opposed to the pull-out test) is a single fiber test capable of examining libers embedded in the actual composite. The... 

Fig. 3.14. Schematic drawings of slice compression test on a single fiber composite (a) before loading (b) peak loading with a maximum fiber protrusion length, (c) after unloading with a residual fiber protrusion length, After Hsueh (1993),...

Andersons, J. and Tamuzs, V. (1993). Fiber and interface strength distribution studies with the single fiber composite test. Composites Sei. Technol. 48, 57-63. 

Asloun, El. M., Nardin, M. and Schultz, J. (1989). Stress transfer in single-fiber composites Effect of adhesion, elastic modulus of fiber and matrix and polymer chain mobility. J. Mater. Sei. 24, 1835-1844. 

Baxevanakis, C. Jeulin, D., Valentin, D. (1993). Fracture statistics of single fiber composite specimen.Co/n/)os/7es Sci. Technol. 48, 47-56. 

Favre, J.P. and Jacques, D. (1990). Stress transfer by shear in carbon fiber model composites Part I Results of single fiber fragmentation tests with thermosetting resins. J. Mater. Sci. 25, 1373-1380. 

Netravali, A.N., Topoleski, L.T.T., Sachse, W.H. and Phoenix, S.L. (1989c). An acoustic emission technique for measuring fiber fragment length distributions in single fiber composite test. Composites Sci. Technol. 35, 13-29. 

Ogata, N., Yasumoto, H., Yamasaki, K., Yu. H., Ogihara, T., Yanagawa, T., Yoshida, K. and Yamada, Y. (1992). Evaluation of interfacial properties between carbon fibers and semi-crystalline thermoplastic matrices in single fiber composites. J. Mater. Sci. 27, 5108-5112. 

Pitkethly, M.J. and Doble, J.B. (1990). Characterizing the fiber/matrix interface of carbon fiber-reinforced composites using a single fiber pullout test. Composites 21, 389-395. 

Scherf, J. and Wagner, H.D, (1992). Interpretation of fiber fragmentation in carbon/epoxy single fiber composites Possible fiber pre-tension effects. Polym. Eng. Sci. 32, 298-304. 

Termonia, Y. (1987). Theoretical study of the stress transfer in single fiber composites. J. Mater. Sci. 22, 504-508. 

Watson, M.C. and Clyne, T.W. (1992b). The use of single fiber pushout testing to explore interface mechanisms in SiC monofilament-reinforced Ti. II. Application of the test to composite material. Acta Metall. Mater. 40, 140-148. 

Fig. 4.4. Axi-symmelric single fiber composite model employed by Rosen (1964).

Fig. 4.6. Schematic drawing of a partially debonded single fiber composite model subject to external stress, (Ta, in the fiber fragmentation test.

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