PSI - Issue 72

Dragana Mihajlović et al. / Procedia Structural Integrity 72 (2025) 195 – 202

197

In order to analyses the tensile behaviour, Micro Tensile Specimens (MTS) with rectangular cross-section were cut from TNZ alloy disks, before and after anodic oxidation, and were subjected to the tensile test using servo hydraulic testing machine Instron 1255 . The MTS and its dimension are presented in Fig. 1a and Fig. 1b. More details about the tensile testing can be seen in Barjaktarević et al. (2021) . Numerical model of MTS, before and after anodic oxidation, which simulated the tensile test, was formed in the software package Abaqus. In 3D model of MTS, a quarter-geometry representation was sufficient, as shown in Fig. 1c. The dimensions of the 3D model of MTS correspond to the dimensions used in the tensile test. In the nodes lying in the planes of symmetry, appropriate boundary conditions were applied to prevent displacements in the direction normal to the plane. The load is defined by the set displacement of the rollers, as in the experiment. The contact between the MTS and the rollers is given with a friction coefficient of 0.1. The finite element method (FEM) calculations were made in Abaqus software package, by using the quadratic interpolation with reduced integration, FE type C3D20R. Instead of von Mises criterion, the complete Gurson model (CGM) [9], which is included in the group of micromechanical models, which are used for modelling the ductile fracture of metallic materials, Rakin et al. (2009), was used.

( a)

(b)

(c)

Fig. 1. (a) The positions on the disk-shaped samples where the MTS were cut, (b) schematic representation of the dimensions of the MTS (all dimensions are in mm) and (c) 3D model of the micro tensile specimen and finite element mesh.