Draw stress

More recently, Sha et al. [53] pointed out the necessity of using a rate-dependent drawing stress ac as reported in [29,30]. If only this depen-... 

We now suppose that the craze drawing stress increases approximately as a power of the plastic strain, i.e.. 

The fracture toughness as shown in Eq. 3, scales like the life-time times the fibril drawing stress ct,.. The Ki(Ve) curve remains unchanged in solvent vapor in spite of the changes in Tq and and hence the effects of vapor on and are about the same, but in the opposite way, resulting probably from the same physical effect. 

The tenacity and physical characteristics of the fiber can also be controlled by the extent of the draw. Limited orientation, produced at low draw stresses, leads to a medium-tenacity nylon yarn with low tensile strength, low modulus, and high extensibility, which are all properties associated with a flexible soft material suitable for clothing. Higher draw rates yield high-tenacity, high-strength yarns, which are... 

The diameter of as-spun fiber decreased from around 20-30 p,m to about 15 pm after drawing, while the size of the polystyrene morphology reduced about 10%. This indicates the drawing process did not effectively deform the solid dispersed phase, because it is difficult for the draw stress to transfer from the matrix to the dispersed phase through the solid interface, and the free space for the polystyrene phase deformation is limited. 

Point II is the maximum of the force/deformation curve and is called the yield stress The drawing stress is at point III. Finally, the tenacity at break or the tensile strength and the elongation at break occur at the point IV. The region between the points la, II, and III is what is known as the ductile region. The decrease in tensile stress with increasing strain between... 

Fin. II- Drawing stress changes as the inclu.sion pas.ses through the die. 

Fig. 18 show AE and drawing stress three stages of drawing (Yoshida et al., 1994). 

Fit . AE signal and drawing stress during clad wiredrawing (or = 20°). 

Fig. 23 shows the relationship between drawing length and AE output, and between drawing length and drawing stress. As shown in Fig. 18, there were two drawing lengths... 

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