Stress at 50% strain elongation

Flow stress at 50% strain [MPa] Elongation % Direction of sampling, degree... 

Of prime interest are the tensile properties summarized in Table 4, and typical of stress-strain curves exhibited by thermoplastic elastomers. The elongation and strength at break were measured above 1000% and 50 MPA, respectively. Both the tensile modulus and the stress at yield increased by increasing the PCL relative content whereas, as expected, the ultimate elongation at break slightly decreased. 

Elastic modulus was measured by a dynamic method at 160 °C. on samples with 2-inch bench marks elongated at a constant rate of 100% per minute. The stress at strains of 25, 50, 75, and 100% was used to calculate Youngs modulus. Elongation at rupture at 160°C. was measured at the same relative rate of elongation, the mean of four measure-... 

As seen in Table 3.6, the following criteria were used by us (a) oso - the stress to produce a 50% strain level (b) Tr - the temperature at which the polymer rupture occurred (c) E - elongation at break (d) R - residual elongation (e) tioo - the temperature at which the sample reached a 100% level of elongation. 

Fig. 4.7 Stress-strain curves for polymer PU3 (DBDI-PEA-BDO) at nominal strain-rate 3.1x10 s (a) interrupted test, with 10 min. stress relaxation at intervals of 50% elongation (b) continuous test [61]...

Figure 9.5 Stress-strain behavior of iightly cross-linked natural rubber at 50°C. Curve (a), experimental. Theoretical is equation (9.4). Cun/e (c) illustrates the reversible nature of the extension up to a = 5.5. At higher elongation, curve (b), hysteresis effects become important. The theoretical curve has been fitted to the experimental data in the region of small extensions, with nRT= 0.39 N/mm= (47,48).

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