32 C. A. Sciammarella et al. 2500 2000 1500 500 0 1000 0 10 20 30 40 50 60 Onset of plasticity Force (N) Δt = 70.85s dtot (%) Δt = 34.06s Δt = 20.36s Δt = 15.08s Fracture Fig. 3.14 Snapshots of the iso-derivatives εv (x, P) of specimen No. 2 of [10] at different points near the maximum load of the specimen. The strain axis corresponds to the logarithmic definition of strain Fig. 3.15 Plot of the iso-derivatives in the specimen no. 2 [10], corresponding to the snapshots of Fig. 3.14
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