Parameter identification for thermo mechanically coupled, ductile damage modells – Framework development, modelling and application

• Applicant: Dr.-Ing. Lars Rose
• Subject Area: Mechanics
• Term: since 2026
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 570999404

The goal of the project is to develop a unified approach for identifying material parameters of thermo-mechanically coupled damage models, taking into account the corresponding temperature development and addressing related research questions (RQ) concerning modeling and parameter identification. The selected materials are the aluminum alloy AW6082 and the steel alloy EN 1.4301. These alloys are used in various industries, are readily available, and their basic behavior can be well described using classical material models. Research question 1: How can common damage models be meaningfully extended by considering dissipation related heat sources, and what influence do different modeling approaches have on the applicability to the materials used in this project? Research question 2: How can the parameters of a thermo-mechanically coupled model be identified, using experimetns with larger temperature intervals, while taking into account full coupling, and what type of experiment or experimental data is at least required for a meaningful solution to the inverse problem? Research question 3: What influence do regularization parameters have on the identification, as well as on the validation and transferability of parameter sets? To answer these questions, the following project goals (PG) are to be achieved: Project goal 1: Formulate two thermo-mechanically coupled damage models according to Lemaitre and Gurson and extend the models with thermodynamically consistent parameters that allow the scaling of dissipation. Project goal 2: Compare the different model predictions using an aluminum alloy (AW6082) and a steel alloy (EN 1.4301). Project goal 3: Develop a procedure for identifying temperature- and displacement-based parameters over higher temperature intervals. Project goal 4: Apply and verify the developed procedure in experiments with an aluminum alloy (AW6082) and smaller temperature intervals. Project goal 5: Apply and validate the developed procedure in experiments with a steel alloy (EN 1.4301) and larger temperature intervals. Project goal 6: Analyze the influence of the regularization parameters and the transferability of identified model parameters under various regularization conditions.

• DFG Programme: Research Grants