Damage Prediction and Evolution using Uncoupled Elastoplastic-Damage Lemaitre’s and Vaz’s Models
El-Shourbagy, M., Attia, M., El-Shafei, A. (2021). Damage Prediction and Evolution using Uncoupled Elastoplastic-Damage Lemaitre’s and Vaz’s Models. EKB Journal Management System, 36(2), 33-42. doi: 10.21608/eijest.2021.69915.1063
Mohamed Akram El-Shourbagy; Mohamed Adly Attia; Ahmed Gad El-Shafei. "Damage Prediction and Evolution using Uncoupled Elastoplastic-Damage Lemaitre’s and Vaz’s Models". EKB Journal Management System, 36, 2, 2021, 33-42. doi: 10.21608/eijest.2021.69915.1063
El-Shourbagy, M., Attia, M., El-Shafei, A. (2021). 'Damage Prediction and Evolution using Uncoupled Elastoplastic-Damage Lemaitre’s and Vaz’s Models', EKB Journal Management System, 36(2), pp. 33-42. doi: 10.21608/eijest.2021.69915.1063
El-Shourbagy, M., Attia, M., El-Shafei, A. Damage Prediction and Evolution using Uncoupled Elastoplastic-Damage Lemaitre’s and Vaz’s Models. EKB Journal Management System, 2021; 36(2): 33-42. doi: 10.21608/eijest.2021.69915.1063

Damage Prediction and Evolution using Uncoupled Elastoplastic-Damage Lemaitre’s and Vaz’s Models

The Egyptian International Journal of Engineering Sciences and Technology
Article 1, Volume 36, Issue 2, December 2021, Page 33-42  XML PDF (910.4 K)
Document Type: Original Article
DOI: 10.21608/eijest.2021.69915.1063
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Authors
Mohamed Akram El-Shourbagy email orcid ; Mohamed Adly Attiaorcid ; Ahmed Gad El-Shafei
Department of Mechanical Design and Production Engineering, Faculty of Engineering, Zagazig University, 44519, Zagazig, Egypt
Abstract
This paper presents the two uncoupled elastoplastic-damage models; uncoupled Lemaitre’s and Vaz’s damage models. The two models are implemented into the finite element ABAQUS software using user routine UMAT to analyze and predict damage and damage evolution. In the context of von-Mises yield criteria, damage variable and fracture indicator are predicted, in addition to the von-Mises stress and the effective plastic strain. Both the elastoplastic tangent operator and the return mapping procedure are formulated using the consistent formulation. Two cases have been analyzed; the first one is an axisymmetric notched bar, while the second case is a plane strain doubled notched plate. In addition to the aforementioned predictions, a parametric study is carried out to explore the effect of the damage denominator and damage exponent on the damage behavior. It is concluded that the two models succeeded in the prediction of the point of fracture, while the uncoupled Lemaitre's damage model gives a more efficient description of the damage band.
Keywords
Plasticity; Lemaitre’s damage model; Finite element; Damage variable; Fracture indicator
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