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The peak stress at the end of the mechanical-elongation phase (peak ■) time tp, increased linearly with increasing axial peak strain. However, the equilibrium stress at the end of the stress-relaxation phase (equilibrium ▼) at time tr, was independent of the equilibrium stress. Note that after stress-relaxation the equilibrium strains increased by 1.71±0.37 as shown in Fig. 4.
