Tearing energy master curve

Fig. 4. Rubbery tear energy master curves for Epon 878/diaminodiphenylmethane networks of different reactant ratios O A/E = 0.65 A/E = 1.00 A A/E - 1.60. Reference temperature is Tg. Curves constructed using a best fit algorithm. (After Swetlin...

It was found that both normalizations yielded tear energy master curves over all the test temperatures investigated for all but the most highly crosslinked 828/DDS network. The fact that master curves can be generated over the entire range of test temperatures shows the important role that M,. plays in the rubbery fracture of these highly crosslinked epoxies. 

Figure 5.20 Tearing energy master curve of pre-stressed black-filled NR vulcanizate. (Reproduced from ref. 24.)...

Figure 5.21 Tearing energy master curve of unfilled SBR with sulphur content of 2.5 pphr.

FIGURE 1.12 Master curve of tear energy Gc versus rate R of tear propagation at Tg for three cross-linked elastomers polybutadiene (BR, Tg — —96°C) ethylene-propylene copolymer (EPR, Tg — —60°C) a high-styrene-styrene-butadiene rubber copolymer (HS-SBR, Tg — —30°C). (From Gent, A.N. and Lai, S.-M., J. Polymer Sci., Part B Polymer Phys., 32, 1543, 1994. With permission.)... 

For simple C-C crosslinked elastomers (Gent and Lai, 1994), the reduction factors, ar, used to transform tear energy results at different temperatures as in Figure 10.12 to yield a master curve as in Figure 10.13 are found to correspond closely to the universal form of the WLF rate-temperature equivalence relation (Ferry, 1970) ... 

Figure 8.14 Master curves of tear energy for NR/SBRl blend and SBRI. 14.0...

Figure 8.16 Master curves of tear energy for SBR2/SBR1 blend in which shift factor a-Y of SBRl was used.

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