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(a) The true stress vs. natural strain curves from uniaxial tension tests of PTBA are fitted to the Ramberg Osgood model with material parameters given in Table I. (b) Comparison of theoretical and experimental results on critical electric fields for the creasing-cratering instability of PTBA under various temperatures. The values of experimental data in (b) represent mean and standard deviation of critical electric fields measured at each temperature (n = 4).
