TAILIEUCHUNG - Implementation and application of Dung’s model to analyze ductile fracture of metallic material
In this paper, the Dung’s microscopic damage model which depicts void growth under plastic deformation is applied to predict ductile fractures in high strength steel API X65. The model is implemented as a vectorized userdefined material subroutine (VUMAT) in the ABAQUS/Explicit commercial finite element code. | TAÏP CHÍ PHAÙT TRIEÅN KH&CN, TAÄP 18, SOÁ K4- 2015 Implementation and application of Dung’s model to analyze ductile fracture of metallic material Hao Nguyen Huu 1 Trung N. Nguyen 2 Hoa Vu Cong 1 1 Ho Chi Minh city University of Technology, VNU-HCM 2 Purdue University, West Lafayette, IN 47907, USA (Manuscript Received on August 01st, 2015, Manuscript Revised August 27th, 2015) ABSTRACT: In this paper, the Dung’s microscopic damage model which depicts void growth under plastic deformation is applied to predict ductile fractures in high strength steel API X65. The model is implemented as a vectorized userdefined material subroutine (VUMAT) in the ABAQUS/Explicit commercial finite element code. Notched and smooth round bars under uniaxial tension loading are simulated to show the effect of equivalent plastic strain versus the void volume fraction growth of the material at and after crack initiation. Predictions of the ductile behavior from void nucleation to final failure stage are compared with the built-in Gurson – Tvergaard – Needleman (GTN) model in ABAQUS. Also, comparison with experimental results from the literature is discussed. Key words: Ductile fracture, Void growth, Dung’s model, Micro-crack mechanism 1. INTRO DUCTIO N Ductile fracture of metallic material is usually due to void nucleation, growth and coalescence. To investigate this process, the series of experiments are needed to conduct. This is necessary, but it is quite expensive and time cost. For these reasons, finite element ductile failure simulations based on the local approach is considered as the most effective method and quite useful. Fracture mechanic based on mechanism of void nucleation, growth and coalescences connect between micro structure variables and macro crack behavior of metallic materials. The plastic failure process due to void nucleation, growth and coalescences includes two phases: homogeneous deformation including void nucleation and growth, local .
đang nạp các trang xem trước
