... in the symmetry section of the front ridge was calculated. Furthermore, the ductile fracture law was also included to predict the mechanism and the initiation location of fracture in the scratching process. The predictive results were further validated by scanning electron microscope (SEM) observations...

... ) = σ y 0 + K ( ε ¯ p ) n where σ y 0 stands for the initial yield stress, n is the strain hardening exponent, and K is the strength coefficient. The ductile fracture takes place in three stages: (i) nucleation, (ii) growth, and (iii) coalescence...

... Thomason , P. F. , 1998 , “ A View on Ductile-Fracture Modeling ,” Fatigue Fract. Eng. Mater. Struct. , 21 ( 9 ), pp. 1105 – 1122 . 10.1046/j.1460-2695.1998.00077.x 15 Tasan , C. C. , Hoefnagels , J. P. M. , and Geers , M. G. D. , 2009 , “ A Brittle-Fracture Methodology...

...Sergei Alexandrov; Lihui Lang This paper deals with some general properties of a ductile fracture criterion, which generalizes two ductile fracture criteria conventionally adopted for metal forming analysis and design. The results are valid for a wide class of material models applicable to both...

... 01 2008 23 05 2008 carbon nanotubes cutting ductile fracture failure analysis finite element analysis machining polymers carbon nanotube composites machining model Part I of this paper dealt with the development of a microstructure-level finite element machining...

.... An elastic-plastic constitutive model with experimentally validated damage models are incorporated through the user subroutine VUMAT in ABAQUS , for modeling deformation and ductile fracture in the material. Macroscopic experiments with microscopic observations are conducted to characterize the material...

... on the current value of the void volume fraction. Two other criteria which are basically due to Thomason’s internal necking condition ( Thomason, P. F., 1990, Ductile Fracture of Metals, Pergamon, Oxford ) as well as McClintock’s shear band formation criterion are applied ( McClintock, F. A., Kaplan, S. M...

... towards the free surface. Depending on the work material hardness and cutting conditions, catastrophic failure within the upper region of the primary shear zone occurs through either ductile fracture or large strain plastic deformation. Prior to the onset of chip segmentation, which occurs with increases...

..., resulting in up to 1400 elements in the entire mesh. This element size is not necessary to predict the process force correctly, but it will be vital to accurately describe the field variables, needed to precisely predict ductile fracture initiation. The punch moves down and penetrates the specimen...

...A. M. Goijaerts; L. E. Govaert; F. P. T. Baaijens This study is focused on the description of ductile fracture initiation, which is needed to predict product shapes in the blanking process. Two approaches are elaborated using a local ductile fracture model. According to literature, characterization...