Fiber tenacity

Fiber Tenacity, N /tex Initial modulus, N/tex Elongation at break, %... 

Mechanical Properties of Fiber. Tenacities and initial moduli were obtained for fiber samples using an Instron tensile tester Model TT-B. The extension rate was 2.54... 

Fig. 18. Correlation between carbon fiber tensile strength and stabilized fiber tenacity. = AN/VBr optimized (cf. Sea. 5)...

Fiber Tenacity Elongation Elastic recovery (%) after elongation of ... 

Fiber tenacity Also called breaking strength. The term generally used... 

Although the most remarkable change by acetalization is the increase in hot-water resistance, the mechanical properties of fibers are also affected. Acetalization has practically no effect on fiber tenacity, but formalization induces brittleness in fibers. For example, a heat-treated fiber shows 70-80% relative knot strength, which drops by formalization to 55-65%. There is a rather large difference of resilience between the formalized and unformalized fibers, as shown in Figure 4.20 [114]. It can be seen that the resilience of the unformalized PVA fibers is rather high, but it drops markedly with an initial formalization of less than 20% the drop in fiber resilience after further formalization is very small. 

Fiber Tenacity Extension Rupture Modulus Tenacity Extension Rupture Modulus... 

Fig. 9.4 Schematic curves showing the effect of orientation on PP fiber tenacity (source Reference 9)...

Fiber Tenacity (g/den) Breaking extension (%) work factor Elastic recovery 2% elongation (%) Stiffness (g/tex) Toughness (g/tex) Work to rupture (mN/tex) biitial modulus (N/tex) Ratio tensile modulus over shear modulus Breaking twist angle (a°)... 

Similar to conventional plant fibers, tenacity and stiffness of plant fibers are lower than that of E-glass fiber, the commonly used reinforcement element. Nevertheless, if the fact that the densities of plant fibers (-1.4 g/cm ) are lower than E-glass (-2.5 g/ cm ) is considered, it will be obvious that the specific tenacity and the specific stiffness of plant fibers becomes comparable to that of E-glass [70]. 

Instron Model 1125 interfaced with an IBM Personal System/2 Model 55 SX computer equipped with Labvanlage Series IV software. Fiber tenacity, strain, and modulus were recorded. Fabric characterization consisted of evaluating basis weight, thickness, light transmittance, moisture transmittance, and tensile strength and elongation as described previously. 

Keywords bulk continuous fibers (BCF), crystallinity, drawing, elasticity, elongation, fiber-forming polymer, fiber monofilament, low oriented yam (LOY), melt blown process, melting, monofilament, multifilament silk, orientation, partially oriented yam (POY), staple fibers, spinning, spunbonded fibers, stmcture, technical fiber, tenacity, textile fiber, texturing. 

Fig. 5. Typical stress-strain curves of as-spun and heat-treated (HT) PBZT fibers. The unit conversion of fiber tenacity 1 N/tex = 0.102 kg/tex = 11.3 g/d, and the fiber tensile strength in pascal (SI unit) can be obtained as 1 N/tex = p x 10 Pa = p x 1 GPa, where p is the fiber density in g/cm . Reprinted from Ref. 29, by courtesy of Marcel Dekker, Inc.

Figure 2 shows the correlation between the fiber tenacity of poly(pheny1-1,4-phenylene terephthalate) and melt viscosity, which is a measure of the polymer molecular weight. Melt-spun fibers were heat-treated in an oven at 300 C and at 320°C for various times, removed and chopped, and then compression molded into sample disks for use in determining the melt viscosity of the remelted fibers with a Rheometrics Mechanical Spectrometer in the... 

Fig. 2. Correlation of fiber tenacity and melt viscosity of poly(phenyl-1,4-phenylene terephthalate).

I would like to acknowledge the numerous contributions of H. F. Kuhfuss and J. C. Morris, who also prepared the polyesters. I am also indebted to R. M. Schulken and R. H. Cox for determination of the relaxation times and melt viscosities, B. L. Neff for determination of the molecular weights, P. D. Griswold for determination of the correlation of fiber tenacity and melt viscosity, Karen J. Watkins for the X-ray analyses, and J. B. Davis for the microscopy data. 

---