Investigation of localized necking in substrate-supported metal layers: comparison of bifurcation and imperfection analyses
Article dans une revue avec comité de lecture
Date
2015Journal
International Journal of PlasticityAbstract
Localized necking is often considered as precursor to failure in metal components. In modern technologies, functional components (e.g., in flexible electronic devices) may be affected by this necking phenomenon, and to avoid the occurrence of strain localization, elastomer substrates are bonded to the metal layers. This paper proposes an investigation of the development of localized necking in both freestanding metal layers and elastomer/metal bilayers. Finite strain versions of both rigid–plastic flow theory and deformation theory of plasticity are employed to model the mechanical response of the metal layer. For the elastomer, a neo-Hookean constitutive law is considered. Localized necking is predicted using both bifurcation (whenever possible) and Marciniak–Kuczynski analyses. A variety of numerical results are presented, which pertain to the prediction of localized necking in freestanding metal layers and metal/substrate bilayers. The effects of the constitutive framework and the presence of an elastomer substrate on strain localization predictions have been specifically highlighted. It is demonstrated that the addition of an elastomer layer can retard significantly the occurrence of localized necking. It is also demonstrated that the results of the Marciniak–Kuczynski analysis tend towards the bifurcation predictions in the limit of a vanishing size for the geometric imperfection.
Files in this item
Related items
Showing items related by title, author, creator and subject.
-
Article dans une revue avec comité de lectureJEDIDI, Mohamed Yassine; BEN BETTAIEB, Mohamed; KHABOU, Mohamed Taoufik; BOUGUECHA, Anas; HADDAR, Mohamed; ABED-MERAIM, Farid (Elsevier, 2020)In the present contribution, a two-surface plasticity model is coupled with several diffuse and localized necking criteria to predict the ductility limits of hexagonal closed packed sheet metals. The plastic strain is ...
-
An Anisotropic Model with Linear Perturbation Technique to Predict HCP Sheet Metal Ductility Limit Chapitre d'ouvrage scientifiqueJEDIDI, Mohamed Yassine; BEN BETTAIEB, Mohamed; KHABOU, Mohamed Taoufik; BOUGUECHA, Anas; HADDAR, Mohamed; ABED-MERAIM, Farid (Springer International Publishing, 2022)In this paper, hexagonal closed packed (HCP) sheet metal ductility for a viscoplastic material is analyzed by using a linear perturbation technique. It can be used for the analysis of local-ized necking. This technique is ...
-
Chapitre d'ouvrage scientifiqueJEDIDI, Mohamed Yassine; BEN BETTAIEB, Mohamed; BOUGUECHA, Anas; KHABOU, Mohamed Taoufik; HADDAR, Mohamed; ABED-MERAIM, Farid (Springer International Publishing, 2019)In many engineering applications (automotive, computer and mobile device industries, etc.), magnesium alloys have been widely used owing to their interesting physical and mechanical parameters. However, magnesium alloys ...
-
Communication avec acteJEDIDI, Mohamed Yassine; BEN BETTAIEB, Mohamed; KHABOU, Mohamed Taoufik; HADDAR, Mohamed; ABED-MERAIM, Farid (Springer, 2018)Due to their lightness, low stiffness and high strength, Hexagonal Closed Packed (HCP) materials are widely used in aeronautic and aerospace industries. In this paper, the ductility limit of HCP sheet materials at room ...
-
Communication avec acteJEDIDI, Mohamed Yassine; BEN BETTAIEB, Mohamed; BOUGUECHA, Anas; KHABOU, Mohamed Taoufik; HADDAR, Mohamed; ABED-MERAIM, Farid (Springer, 2018)In many engineering applications (automotive, computer and mobile device industries, etc.), magnesium alloys have been widely used owing to their interesting physical and mechanical parameters. However, magnesium alloys ...