PSI - Issue 68

Paolo Ferro et al. / Procedia Structural Integrity 68 (2025) 988–1002 Ferro et al./ Structural Integrity Procedia 00 (2025) 000–000

991

4

r e

z e = 0

H 1

z m = -H 1

r m

H 2

H (plate thickness) z i = -H

r i

Fig. 1. Volumetric heat source superposition and local reference system moving along the y direction at a speed v.

Fig. 2. Numerical model (mesh) with reference system and geometrical parameters.

Exploiting the symmetry of load and geometry, adiabatic condition was applied to the symmetry plane shown in Fig. 2. Convective heat transfer coefficient (h c ) and the emissivity of the material were set to 25 [W/(m 2 K)] (Solomon et al., 2018) and 0.7, respectively. Physical and thermal material properties were taken as a function of temperature from ThermoClac® database. To consider the latent heat produced during the liquid to solid transformation (and vice versa) the apparent heat capacity approach was used (Zeli et al., 2012). Following the CWM approach, the temperature history calculated at each node of the numerical model is used as input load for the mechanical computation (uncoupled thermomechanical analysis). The kinematic strain hardening model was chosen while clamping condition was imposed as isostatic. Thermo-mechanical properties as a function of temperature were taken from the report of Nickel Institute and the work by Du et al. (2018). Finally, to simulate the effect of fusion zone in mechanical computation, a function is used that deletes the mechanical history of those elements that reach the solidus temperature of the alloy