Fibers length effect

Figures 7.2 and 7.3 show the thermomechanical properties as dimensional stability and thermal expansion of PP matrix, PP/KE biocomposites and PP/KE/nanoclay nanobiocomposites with increasing temperatme from 30 C to 100°C. Figure 7.2 represents the KE fiber length effect on dimensional change curves of (a) PP nanocomposites, (b)...

The level of modulus increase by chopped high modulus fibers is less than for continuous filaments at the same volume loading. There is both a fiber length effect and a fiber orientation effect both of which reduce the modulus. One may accoimt for the fiber length effect by writing Eq. 2.16b as [78]... 

FIG U RE 1.37 Effects of extraction time and fiber length on two-phase LPME of mirtazapine stereoisomers.156 Influence of extraction time (A) and acceptor-to-donor phases volume ratio (B) on the efficiency of LPME. Plots for the (+)-(5)-mirtazapine (white bars) and (-)-(R)-mirtazapine (black bars) enantiomers (response in area counts). Extraction conditions (A) 1 mL plasma sample 0.1 mL 10 M NaOH 3.0 ml deionized water 7.0 cm fiber length 22 /rL toluene (B) 30 min of extraction 1 mL plasma sample 0.1 mL 10 M NaOH 3.0 mL deionized water toluene. (Reproduced with permission from Elsevier.)... 

Fu, S. and Lauke, B Effects of fiber length and fiber orientation distributions on the tensile strength of short-fiber-reinforced polymers, Composites Sci. Technol., 56, 1179 (1996). 

Effects of Washing Temperatures on Fiber Length Characteristics(3)... 

The normalized FAS and IFSS are shown in Fig. 4.17. Both the FAS and IFSS distributions are higher for larger values of residual clamping stress, go, (in absolute terms) for a given fiber length. Varying the coefficient of friction, p, would have similar effects on the stress distributions. The predominant effect of differential Poisson contraction between the fiber and matrix is obvious, particularly in Fig. 4.17(b), where the IFSS values at the fiber ends are several-fold the values obtained in the center. 

Gray, R..1. (1984). Analysis of the effect of embedded fiber length on the fiber debonding and pull-out from an elastic matrix. J. Mater. Sci. 19, 861-870. 

Russel, W.B. (1973), On the effective moduli of composite materials effect of fiber length and geometry at dilute concentrations. J. Appl. Math. Phys. (ZAMP) 24, 581-599. 

Mathematically the critical fiber length necessary for effective strengthening and stiffening can be described as follows ... 

The second factor that affects performance in discontinuously reinforced FMCs is fiber length. This has an effect primarily on the ease with which the composite can be manufactured. Very long fibers can create difficulties with methods used to create discontinuously reinforced FMCs and can result in nonuniform mechanical properties. The third factor is also related to fiber geometry, namely, the fiber shape. Recall that the... 

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