Dresden 2026 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 34: Hydrogen in Materials I
MM 34.3: Talk
Thursday, March 12, 2026, 16:15–16:30, SCH/A215
Theoretical study of temperature dependencies in HELP- and HEDE-based damage models on the fatigue behavior of ferritic steel by hydrogen — Alexandra Stark1, 2, Petra Sonnweber-Ribic1, and •Christian Elsässer2,3 — 1Robert Bosch GmbH, CR, 71272 Renningen — 2Fraunhofer IWM, 79108 Freiburg — 3University of Freiburg, FMF, 79104 Freiburg
In this theoretical study, the influence of temperature dependencies in hydrogen embrittlement (HE) models on the fatigue damage of ferritic steel is investigated by using a coupled hydrogen-diffusion and crystal-plasticity finite-element simulation framework. We focus on the characteristic ''bell-shaped'' dependence of HE on temperature and examine its effects by means of HE models based on Hydrogen Enhanced Local Plasticity (HELP) and Hydrogen Enhanced Decohesion (HEDE) mechanisms. Hydrogen-induced fatigue damage is monitored by a fatigue indicator parameter (FIP): maximized damage occurs within a narrow temperature range consistent with experimental results reported in literature. Our results arise from an interplay of plastic strain localization and hydrogen trapping, combined with a sufficiently efficient supply of hydrogen. The findings of this study highlight how the interplay of hydrogen diffusivity, trap filling kinetics, and available diffusible hydrogen plays a critical role for the temperature dependence of HE. In addition, the influence of varying trap binding energies is explored, which has a substantial effect on both temperature behavior and induced fatigue damage.
Keywords: Hydrogen Embrittlement; Crystal Plasticity Finite Element Model (CPFEM); Fatigue Indicator Parameter; Temperature Dependence