PSI - Issue 24

Giuseppe Mirone et al. / Procedia Structural Integrity 24 (2019) 259–266 Mirone & Barbagallo / Structural Integrity Procedia 00 (2019) 000 – 000

263

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Fig. 1. Experimental true stress-true strain data of the static tests at different temperature

Table 2. Yield Stress and Necking Strain for static temperature tests

σ yield [MPa] ε N−T

S-T ROOM (20) S-T80 S-T140 S-T200 S-T300

447.5

460 0.35

420 0.19

420 0.18

400 0.18

0.44

Fig. 2. Thermal softening 3D function If the coupling between and in affecting the softening is also included in the derivation of the Considère condition, then the necking strain of eq. (4) is updated as in eq. (8). − = 1− 1 ∙ ( + ∙ ) (8) It is reasonable to assume that the thermal effects characterized so far by static tests also apply in the dynamic tests, with the same consequences on the anticipation of the necking strain, eventually opposed by the strain rate effect