Comparative evaluation of experimental andphase-field modeling approaches in the tensile response of S1100QL steel

Abstract

Phase-field Damage Modeling (PFDM) has gained considerable attention as a robust frameworkforrepresenting material degradation and failure. Its capacity to describe the progressive evolution of damagehasled to increasing integration into finite element method (FEM) codes, establishing PFDMas a promisingtoolfor structural assessment. In this study, an axisymmetric PFDM formulation is implemented andvalidatedthrough comparison with experimental tensile tests on high-strength S1100QL steel specimens. Cylindrical specimens were machined from the base material using CNC lathes to determine its tensileproperties. The tensile tests were subsequently performed on a universal testing machine, ZWICKROELLZ/100 (ZWICKROELL GmbH, Ulm, Germany) (Fig. 1a). The critical-total strain-based PFDM implemented into the software PAK-DAMv25 is used for numericalanalysis of tensile tests. For numerical simulation, an FE model was created using 2Daxisymmetricfiniteelements. The simulation was performed using the large strain von Mises plasticity constitutive model andlogarithmic strain measure. The created FE model consists of 970 elements and 1078 nodes. The FEmodel, boundary conditions, and loading of the specimen are given in Fig. 1b. In Fig. 1c, a comparison of the stress-strain diagram for the numerical simulation and the experiment isgiven. The results show good agreement between the experiment and the numerical simulation results.