{"year":"2023","date_updated":"2024-05-14T09:15:38Z","_id":"54282","publication":"PAMM","doi":"10.1002/pamm.202200074","issue":"1","type":"journal_article","title":"A finite strain gradient theory for viscoplasticity by means of micromorphic regularization","volume":22,"author":[{"first_name":"Ayoub","last_name":"Hamdoun","full_name":"Hamdoun, Ayoub","id":"57708"},{"last_name":"Mahnken","first_name":"Rolf","id":"335","full_name":"Mahnken, Rolf"}],"citation":{"chicago":"Hamdoun, Ayoub, and Rolf Mahnken. “A Finite Strain Gradient Theory for Viscoplasticity by Means of Micromorphic Regularization.” PAMM 22, no. 1 (2023). https://doi.org/10.1002/pamm.202200074.","apa":"Hamdoun, A., & Mahnken, R. (2023). A finite strain gradient theory for viscoplasticity by means of micromorphic regularization. PAMM, 22(1). https://doi.org/10.1002/pamm.202200074","short":"A. Hamdoun, R. Mahnken, PAMM 22 (2023).","bibtex":"@article{Hamdoun_Mahnken_2023, title={A finite strain gradient theory for viscoplasticity by means of micromorphic regularization}, volume={22}, DOI={10.1002/pamm.202200074}, number={1}, journal={PAMM}, publisher={Wiley}, author={Hamdoun, Ayoub and Mahnken, Rolf}, year={2023} }","mla":"Hamdoun, Ayoub, and Rolf Mahnken. “A Finite Strain Gradient Theory for Viscoplasticity by Means of Micromorphic Regularization.” PAMM, vol. 22, no. 1, Wiley, 2023, doi:10.1002/pamm.202200074.","ieee":"A. Hamdoun and R. Mahnken, “A finite strain gradient theory for viscoplasticity by means of micromorphic regularization,” PAMM, vol. 22, no. 1, 2023, doi: 10.1002/pamm.202200074.","ama":"Hamdoun A, Mahnken R. A finite strain gradient theory for viscoplasticity by means of micromorphic regularization. PAMM. 2023;22(1). doi:10.1002/pamm.202200074"},"status":"public","intvolume":" 22","publication_status":"published","date_created":"2024-05-14T09:06:38Z","user_id":"57708","publisher":"Wiley","language":[{"iso":"eng"}],"publication_identifier":{"issn":["1617-7061","1617-7061"]},"abstract":[{"lang":"eng","text":"AbstractStretching of polycarbonate films leads to the formation of shear bands in the necking zone [1]. Standard viscoplastic material models render mesh size dependent results, which requires a mathematical regularization. To this end, we present a finite strain gradient theory for a viscoplastic, isotropic material model where we extend the model presented in [2] to a micromorphic model by introducing a new micromorphic variable as an additional degree of freedom with its first gradient [3, 4]. The variable here has the meaning of a micro plastic strain, and is coupled with the macro plastic by a micro penalty term, forcing the macro‐plastic strain to be close to the micro‐plastic strain for the targeted shear band regularization effect. We have implemented the model equations as a three dimensional initial boundary value problem in an in house FE‐tool, to simulate different geometries with different thickness and to compare it the experimental tests. The analysis is performed for a uniaxial tensile geometry as well as for a biaxial tensile geometry. The numerical examples show the ability of the model to regularize the shear bands and solve the problem of localization."}]}