Effect of ductile fracture criteria on chevron crack formation and evolution in drawing

Komori, Kazutake

doi:10.1016/s0020-7403(03)00035-3

Cited by 57 publications

(27 citation statements)

References 25 publications

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“…The drawing length, and hence the number of defects, was chosen such that the periodicity of the defects could be clarified in a 'reasonable' computational timeframe. In studying the formation of central burst defects in copper wire, Komori (2003) made similar experimental observations regarding the fluctuations in drawing load. Figure 7 shows the finite element mesh generated for single stage drawing under process conditions of 25% reduction in area and 15 • semi-die angle.…”

Section: Results and Analysismentioning

confidence: 91%

“…Komori (1999Komori ( , 2003 and Ko and Kim (2000) have investigated the occurrence of central burst defects in drawing and extrusion respectively, utilizing rigid plastic material laws. Significant differences in the deformation zone stresses and distribution pattern have been reported where the FE analysis has been approximated using a rigid-plastic material law (Pilarczyk et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

“…Any elastic affects on damage development in single and multipass drawing needs accounting for using an elastic-plastic material law. Finite element modelling of fracture propagation has traditionally been achieved by splitting nodes along a crack path and allowing the adjacent elements to separate (Komori, 1999(Komori, , 2003. The node splitting technique has been extended to allow cracks to propagate in any direction, with the drawback of the requirement of remeshing algorithms to define the path accurately.…”

Section: Introductionmentioning

confidence: 99%

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Ductile Fracture by Central Bursts in Drawn 2011 Aluminium Wire

McAllen

Phelan

2005

Int J Fract

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This paper reports on the application of numerical techniques to predict the initiation and propagation of central burst defects in the wire drawing process. The development and implementation of a suitable failure model into a commercial finite element code, via a user written subroutine, has enabled the occurrence of ductile fracture by central bursting in 2011 Aluminium alloy wire to be successfully analysed. In validating the numerical model, the drawing force, die pressure and occurrence of central burst defects has been compared with previously published experimental data. Results from the numerical model suggest that a 'nose shape' curve divides the safe and unsafe zones for the successful drawing of the wire. It follows that no central bursts are expected to occur, regardless of the die angle used, when the reduction ratio is less than a critical value. When central bursts did occur, the effective strain was found to vary periodically along the surface of the wire. These oscillations corresponded with the occurrence of central burst defects and resulted in variations in the final diameter of the wire. These variations in the final diameter of the wire are thought to be representative of an external defect known as 'bamboo markings', which are often an external indication of central burst defects within the wire.

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Section: Results and Analysismentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ductile Fracture by Central Bursts in Drawn 2011 Aluminium Wire

McAllen

Phelan

2005

Int J Fract

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“…Bihamta et al (2010b) optimized the production of variable wall thickness aluminium tubes and evaluated effect of tube initial geometry on the minimum possible final thickness. Komori (2003) reported that in sheet metalworking processes, the forming limit diagram indicates the combination of major and minor in-plane strains beyond which necking or fracture occurs. Since the deformation of the material in the experiments for developing forming limit diagrams is similar to the deformation of the material in the sheet metal industries, obtaining the forming limit in various strain paths is useful for industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the formability limit of aluminium tubes drawn with variable wall thickness

Bui

Bihamta

Guillot

et al. 2011

Journal of Materials Processing Technology

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Investigation of the formability limit of aluminium tubes drawn with variable wall thickness AbstractStructural aluminium tubes have very important industrial applications, particularly in automobile industry. Tube drawing process is wildly used to reduce the outer and inner diameters of tubes. An important issue in the tube drawing process to obtain variable wall thickness is how to determinate and predict its formability limits. Previously published works generally deal with the formability limit of conventional tube drawing based on experimental analysis, analytical method and finite element method. However, in the case of variable wall thickness tubes, there is a lack of knowledge and data in order to predict their limit of formability. In the present study, both theoretical and experimental methods are proposed for estimating the formability limit of the variable wall thickness aluminium tubes used for the transportation purposes. A modification of a conical mandrel was proposed and a special control system for mandrel displacement during the process was used to carry out the drawing tests. During the drawing process, the tube pulling axis was controlled at constant speed while the mandrel was moved to achieve the continuously variable wall thickness. The formability limit in term of minimum wall thickness and maximum area reduction was obtained before tube rupture. These values are useful data for the determination of the extent of deformation during a drawing process that a material can experience without failure. The maximum drawing stress ratio was also determined experimentally. Further, an extension of an upper bound solution developed in previous publications is proposed to predict the drawing stress field. The maximum drawing stress ratio was used as a criterion for fracture analysis. It was shown that the analytical model with its new extension combined to the fracture criterion predicts quite well the thickness and area reduction limit. The experimental studies were completed by examining the microstructure and strain field at the limit state.

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“…Quan et al [2] pointed out that, based on the elasto-plastic theory, the nite-element model was established to simulate the drawing limit analysis of AZ31B tube. Komori [3] compared the experiment results of the behaviors of crack propagation through nite-element analysis of di erent ductile failure theories. Hambli and Reszka [4] provided the fracture criteria identi cation using an inverse technique method and blanking experiment.…”

Section: Introductionmentioning

confidence: 99%

Application of Ductile Fracture Criterion for Tensile Test of Zirconium Alloy 702

et al. 2018

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Abstract. In this study, the critical damage value of normalized Cockcroft-Latham is determined using ductile fracture criterion to de ne fracture energy. True stress-strain value and materials' properties were obtained by the tensile tests of zirconium alloy 702 and nite-element analysis. It was observed that the maximum value of fractured specimen occurred in the central area of the cross-section, where the highest critical damage value equals 0.649. This paper explored the rarely researched data of zirconium alloys through the inverse analysis method of the FEA. The results were proposed to evaluate the forgeability, and the present study could be used as a basis of designing and developing zirconium alloy.

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Effect of ductile fracture criteria on chevron crack formation and evolution in drawing

Cited by 57 publications

References 25 publications

Ductile Fracture by Central Bursts in Drawn 2011 Aluminium Wire

Ductile Fracture by Central Bursts in Drawn 2011 Aluminium Wire

Investigation of the formability limit of aluminium tubes drawn with variable wall thickness

Application of Ductile Fracture Criterion for Tensile Test of Zirconium Alloy 702

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