PSI - Issue 77

Behzad Vasheghani Farahani et al. / Procedia Structural Integrity 77 (2026) 424–431 Behzad V. Farahani et al./ Structural Integrity Procedia 00 (2026) 000–000

429

6

Fig. 2: Illustration on the methodology of assigning element-specific material property to an NRB-R6 numerical model.

a)

b)

Fig. 3: Element-specific material property assignment on NRB-R6: a) spatial distribution of mechanical properties, and b) defined sets within the ROI for assigning heterogeneous hydrogen-related parameters.

Table 1: Material properties used in the finite element simulations (Depraetere et al., 2021). Mechanical and damage

=207 =0.3 1 =1.42 , 2 =0.96 , 3 =2.03 =0.1 =0.1 0 =0.00012 =0.013 =0.27 = 2.15 , =2.87, =2.24 =1.25 , =0.95 , =0.82 = − 60 =8.47 =300

Young's modulus Poisson's ratio

Empirical constants CGM

Standard deviation of nucleating strain

Mean nucleating strain Initial void volume fraction

Void volume fraction of nucleating particles Lattice diffusivity coefficient (×10 −4 2 ⁄ ) Initial hydrogen concentration ( ) Trap binding energy ( / ) Lattice site density (×10 28 −3 ) Temperature ( ) Number of hydrogen residing sites per trap Number of interstitial lattice sites per metal atom Final void volume fraction

Hydrogen diffusion

=1 =6

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