Originally Posted by
cyccommute
You were talking about tensile strength. Figure 2.8 is about the modulus…or stiffness…of the fiber. That doesn’t have anything to do with the dimensional stability. Look at the section just below Figure 2.8. It says that there is very little change in dimension of Kevlar when exposed to heat and even that change is negative. In other words, it would get tighter, not looser.
Modulus is stress divided by elastic strain.
Figure 2.8 show that the kevlar bead will inherently stretch and become looser as temperature increases.