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Mean and standard deviation of (a) E+Y, (b) α , (c) β, and (d) τ from tensile stress-relaxation tests at various applied strains. Experiment 1: ▲ for // samples, Δ for ⊥ samples. Experiment 2: ◆ for // samples, ■ for ⊥ samples. Additional symbols denote significant statistical differences against corresponding values at 2 % (*), 4 % (†), and 6 % (×) strain levels (p<0.05).
