Tensile strengths of fibers

FIGURE 4.34 Relationship between tensile strength of fibers and flexural strength of slates. Fiber/ cement 3wt%. 

The tensile strengths of fiber-reinforced plastics may, depending on the system, be even higher than for metals (Figure 35-16). Glass-fiber-reinforced epoxides also achieve much higher extensions at break than iron, titanium, or aluminum. 

Figure 3.47 Tensile strength of fiber carbonized at 1100°C and 1600°C from Courtauld s SAF oxidized in air at 220°C for relaxed and constrained fiber. Source Kind permission of Acordis Ltd (formerly Courtaulds PLC).

In reality, none of the four assumptions above are obeyed exactly in many in-dnstrial composites Glass fibers are often as brittle as epoxy resins most polymer matrices behave in a nonlinear elastic or plastic fashion beyond a certain strain the quality of interfacial bonding varies according to the composite system, and is statistical along the fiber length and the tensile strength of fibers is statistical rather than uniform because of the presence of various defect populations (as briefly discussed earlier). 

The ultimate tensile strength of fibers appears to be dependent on the ambient temperature during spinning which is usually set from 9 to 60 C. Postema et... 

Kamiya K, Katayama A., Suzuki H., Nishida K., Hashimoto T., Matsuoka J., Nasu H. Preparation of silicon oxycarbide glass fibers by the sol-gel method—effect of starting sol composition on tensile strength of fibers. J. Sol-Gel Sci. Technol. 1999 14 95-102... 

Eccostat ASP will not cause any discoloration nor impair the tensile strengths of fibers. 

Figure 4.4. Dr. Hinkebein s instrument designed to measure the tensile strength of fibers.

Table 15.5. Longitudinal compressive and tensile strengths of fibers. Data obtained at 20°C and 65% relative humidity.

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