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Application of a Dung’s Model to Predict Ductile Fracture of Aluminum Alloy Sheets Subjected to Deep Drawing

In this paper, prediction of failed evolution of anisotropic voided ductile materials will be developed based on Dung’s microscopic damage model. An isotropic and anisotropic formulation of the Dung’s damage model that using von Mises yield criterion and Hill’s quadratic anisotropic yield criterion (1948) integrated with isotropic hardening rules of matrix material used to simulate the deep drawing process of aluminum alloy sheets. | SCIENCE & TECHNOLOGY DEVELOPMENT, Vol 18, No.K4- 2015 Application of a Dung’s Model to Predict Ductile Fracture of Aluminum Alloy Sheets Subjected to Deep Drawing Hao Nguyen - Huu 1 Trung N. Nguyen 2 Hoa Vu - Cong 1 1 Ho Chi Minh city University of Technology, VNU-HCM 2 School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA (Manuscript Received on August 01st, 2015, Manuscript Revised August 27th, 2015) ABSTRACT: In this paper, prediction of failed evolution of anisotropic voided ductile materials will be developed based on Dung’s microscopic damage model. An isotropic and anisotropic formulation of the Dung’s damage model that using von Mises yield criterion and Hill’s quadratic anisotropic yield criterion (1948) integrated with isotropic hardening rules of matrix material used to simulate the deep drawing process of aluminum alloy sheets. The model is implemented as a vectorized user-defined material subroutine (VUMAT) in the ABAQUS/Explicit commercial finite element code. The predictions of ductile crack behavior in the specimens based on void nucleation, growth and coelescence are compared with Gurson – Tvergaard – Needleman (GTN) model and experiment results from reference. Key words: Ductile fracture, Sheet forming, Dung’s model, Micro-crack mechanism, Anisotropy. 1. INTRODUCTION Recently, the aluminum alloy materials widely applied in automotive and aerospace industry since their light weight and excellent strength characteristics. The sheet metals made from aluminum alloys by rolling process is usually induced anisotropy. Therefore, investigation of plastic fractured behavior of these materials play an important role in industrial applications. The plastic micro-crack mechanism in the metal materials are based on assuming that matrix material contain inclusions and second phase particles. During matrix material under deformation then micro-crack will appear because of void nucleation, growth and coalescences. Gurson