Tensile yield in nylon 6,6

Abstract

Uniaxial tension tests to, the yield point were performed on poly(hexamethylene adipamide) (nylon 6,6) as a function of temperature from 21 to 200°C at a strain rate of 2 min−1. At 21 and 60°C, measurements were also made at strain rates from 0.02 to 8 min−1. Using simple rate theory, reasonable values of activation volume were obtained, but the simple theory is inadequate to determine the activation energy. The yield‐strain temperature dependence changes at 160°C as a result of a reversible crystal‐crystal transition. Because of this behavior of the yield strain, the yield energy is not a linear function of temperature, as observed for several other polymers.

Tensile yield in polypropylene

“…4 , is unexplained. For nylon 6.6 analogous behavior was observed and identified as the result of a crystal-crystal transition (2). The transition had a significant effect not only on the yield strain but also on the yield energy.…”

“…his paper is the fourth in a series of experi-T mental studies on the tensile yield behavior of crystalline polymers. The previous papers examined poly(4-methylpentene-1) (l), nylon 6.6 (2), and polyethylene (3), while the present paper is devoted to polypropylene. In all these studies, the tensile yield properties-yield energy, yield stress, yield strain, and Young's modulus-were determined as a function of temperature up to the melting point.…”

Tensile yield in polyethylene

“…Since the cross-sectional area of the specimen decreases under tension, the true stress yield point can occur after the load-elongation peak. The true stress, U , is determined from u = L(l + e)/A (2) where L is the load, e is the elongation, and A is the cross-sectional area. To obtain the true yield point, a reference method known as a Considere plot is used (6).…”

The role of filler volume fraction in the strain-rate dependence of calcium carbonate-reinforced polyethylene

“…Elastic strain can be approximately obtained by dividing Young's modulus by yield stress. 17,19 The plots of elastic strain versus the filler volume fraction of composites is shown in Figure 6. It can be seen that elastic strain of materials decreases with increasing the filler volume fraction.…”