PSI - Issue 59

Jesús Toribio et al. / Procedia Structural Integrity 59 (2024) 198–205 Jesús Toribio / Procedia Structural Integrity 00 ( 2024) 000 – 000

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5. Role of hydrostatic stress Table 3 includes, together with the information of the HE experiments, the values of the depth of the HAMD zone (in the form of TTS) and the maximum hydrostatic stress (  max ) at the critical (fracture) instant in the HE tests.

Table 3. Maximum hydrostatic stress (  max ) levels at the fracture instant of the HE tests. Sample u R (m/s) t C (s) F H /F 0 x HAMD (mm)  max (MPa) A10 4.79x10 -7 555 0.79 0.10 917 A3 4.81x10 -7 570 0.80 0.10 922 A9 1.82x10 -7 1365 0.77 0.15 894 A4 3.68x10 -8 5370 0.70 0.30 817 A7 3.96x10 -9 39960 0.63 0.34 735 A1 3.26x10 -9 48600 0.63 0.34 735 B10 1.03x10 -7 780 0.90 0.20 1228 B1 1.02x10 -8 5760 0.79 0.25 1004 B9 8.70x10 -9 7380 0.82 0.21 1067 B7 6.90x10 -9 8520 0.79 0.27 1004 B3 6.23x10 -9 11160 0.85 0.30 1118 B23 6.02x10 -10 75600 0.69 0.60 835 B22 1.87x10 -10 143040 0.48 0.93 559 B21 1.12x10 -10 262800 0.52 1.00 603 C6 1.83x10 -6 516 0.91 0.40 625 C8 9.71x10 -7 972 0.91 0.45 625 C12 3.45x10 -7 2295 0.87 0.40 596 C2 1.54x10 -7 4500 0.84 0.55 574 C11 6.67x10 -8 7560 0.77 0.55 528 C4 5.47x10 -8 8340 0.75 0.50 512 C1 5.85x10 -9 68400 0.72 0.85 497 C7 5.33x10 -9 75000 0.72 0.75 497 D10 2.13x10 -7 660 0.91 0.10 589 D3 2.06x10 -7 780 0.95 0.21 611 D7 4.55x10 -8 3240 0.92 0.33 596 D11 2.45x10 -8 6300 0.93 0.41 603 D5 1.49x10 -8 9000 0.90 0.60 581 D2 1.35x10 -8 9420 0.88 0.50 574 D21 6.98x10 -10 182400 0.88 1.15 574 D24 3.93x10 -10 324000 0.88 1.20 574 u R : remote displacement rate; t C : time to failure or critical time; F H /F 0 : failure load in hydrogen /failure load in air; x HAMD : depth of the hydrogen-assisted micro-damage zone;  max : maximum hydrostatic stress at the notch tip (failure instant)