Issue 35

A. Tzamtzis et alii, Frattura ed Integrità Strutturale, 35 (2016) 396-404; DOI: 10.3221/IGF-ESIS.35.45 400 Tensile behavior The tensile stress-strain behavior of a subsize specimen (ASTM E8M-01) extracted from the location shown in Fig. 3 and the A250 material are compared up to a tensile strain of 5% in Fig. 4. The hardness of A250 material, is similar to the hardness obtained at the mid-point of the specimen gauge length in Fig. 3. Despite the small difference in strength values, the strain hardening behavior in the two cases is very close and the determined strain hardening exponent values are 0.150 and 0.161 for the HAZ and A250 materials respectively. Figure 4 : Stress strain curves for materials A 250 and HAZ at the mid-length of hardness gradient. Figure 5 : Monotonic & cyclic stress- strain curves of T3, A250 and A300 materials.