Damage in Sheet Metal Bending

In the 1^st funding period (FP), the influence of triaxiality on damage evolution and product performance in monotonic bending processes was investigated for DP800. In the 2^nd FP damage control was further studied in processes with non-monotonic load paths, along process chains and during heat treatment (austenitization and quenching) of 22MnB5. In roll forming, damage control for DP800 was achieved by stress superposition through additional elastomer rollers.

The investigation of the 3^rd FP will be devoted to following three new research themes: Firstly, the effect of cyclic loading during forming with changes between positive and negative triaxialities will be investigated.

Secondly, the study of the necessary conditions for void shrinkage, closure and healing are investigated for the hot sheet metal forming process of press hardening 22MnB5.

Thirdly, aluminum AA6082 is studied as a new material class to be used in sheet metal bending to understand the influence of the load path, load direction changes and cyclic forming processes on the damage behavior

Lennemann, P., Grodotzki, J.,  Korkolis, Y.P., Tekkaya, A. E., 2025.

Influence of forming temperature on damage and product performance in hot stamping of steel. Materials Research Proceedings 54. https://doi.org/10.21741/9781644903599-136

Lennemann, P., Grodotzki, J.,  Korkolis, Y.P., Tekkaya, A. E., 2024.

Influence of changing loading directions on damage in sheet metal forming. Advances in Industrial and Manufacturing Engineering Volume 8 (100139). https://doi.org/10.1016/j.aime.2024.100139

Lennemann, P., Grodotzki, J., Tekkaya, A.E., 2023.

Controlling the Damage Evolution in Roll Forming of a V-Section by Elastomer Rollers. Lecture Notes in Mechanical Engineering. https://doi.org/10.1007/978-3-031-42093-1_26

Meya, R., Lennemann, L., Rethmann, P., Tekkaya, A. E., 2021.

Analyse und Kontrolle der Schädigungsentwicklung beim Biegen von hochfesten Werkstoffen. Tagungsband Ilmenauer Federntag. ISBN: 978-3-948595-05-0

Meya, R., Kusche, C., Löbbe, C., Al-Samman, T., Korte-Kerzel, S., Tekkaya, A., 2019.

Global and High-Resolution Damage Quantification in Dual-Phase Steel Bending Samples with Varying Stress States. Metals 9(319). https://doi.org/10.3390/met9030319

Meya, R., Löbbe, C., Tekkaya, A. E., 2019.

Stress state control by a novel bending process and its effect on damage evolution and product performance. International Journal of Manufacturing Science and Engineering 141 (10). https://doi.org/10.1115/1.4044394

Youtube-Link:

https://www.youtube.com/watch?v=wqfBBZHj1M4