Mechanical property changes in drawing/extrusion of hardening viscoplastic materials with damage

Lee, Yong-Shin; Hahm, Seung-Yeun

doi:10.1016/s0020-7403(96)00064-1

Cited by 6 publications

(4 citation statements)

References 7 publications

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“…In order to accurately predict damage evolution in a work piece during rolling, it is essential to evaluate the mean stress or pressure that is known as a pitfall in the analysis of metal forming because of its statically indetermination. In this work, such problem is overcome by adopting CPFEM (Consistent Penalty Finite Element Method) The details of CPFEM are not given here and can be found elsewhere [3,4].…”

Section: Finite Element Analysis For Rolling Of a Multilayer Platementioning

confidence: 99%

“…In order to get the final product with high quality such as high wear resistance, damage-free smooth surface, and proper strength, the 2 nd rolling must be controlled very carefully. The finite element analysis can reduce the cost and time for the process design, it have been widely used for the design of many forming processes [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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A Study on the Rolling of a Multilayer Plate Composed of Teflon-Cu-SPCC Steel

Lee

Yoon

2014

KEM

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This work is concerned with rolling of a Teflon-Cu-SPCC steel plate, which has been used as a base material for an oilless bearing or dry bearing. Materials for an oilless bearing require special characteristics such as high wear resistance, low friction, fast heat loss, as well as structural strength. Such superior mechanical properties could be obtained by rolling the multilayer plate composed of a mixture of Teflon-Cu powder and a SPCC steel. The main objective of this research is to investigate the deformation characteristics of a Teflon-Cu-SPCC steel plate during rolling process. Especially, focus is given to the thickness changes of the Teflon-Cu powder mixture layer. An Eulerian finite element method coupled with a contact profile correction algorithm is adopted for the simulation of rolling. Validity of the proposed finite element analysis is given. The important parameters chosen in this work are the reduction ratio, roll size, and the Cu content in a Teflon-Cu mixture. Effects of the above important parameters on the deformation behavior and on the final thickness of a Teflon-Cu mixture layer are carefully studied.

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Section: Finite Element Analysis For Rolling Of a Multilayer Platementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Study on the Rolling of a Multilayer Plate Composed of Teflon-Cu-SPCC Steel

Lee

Yoon

2014

KEM

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“…Different studies were proposed, highlighting the importance of physical parameters. The constitutive equation of the material is often an elastoplastic constitutive equation [10,11,12,13,14,15] but few details are given for the parameter fit. Moreover, drawing processes often generate high strain rates [16] and the constitutive equation parameters are fitted on quasi-static experimental data without taking into account the strain rate.…”

Section: Introductionmentioning

confidence: 99%

Cold drawing of 316L stainless steel thin-walled tubes: Experiments and finite element analysis

Palengat

Chagnon

Favier

et al. 2013

International Journal of Mechanical Sciences

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Drawing process of thin walled tubes used to fabricate catheters and stents for medical applications was studied. Medical use needs accurate dimensions and a smooth finish of the inner and outer surfaces. This paper deals with 316L stainless steel tubes which are manufactured by means of cold drawing with or without inner plug (mandrel drawing and hollow sinking, respectively). To improve the quality of the finish of the tubes, numerical modelling can be used. In this way, a thermomechanical study of the drawing process is proposed to determine experimentally the physical parameters. This study proposes to evaluate the different parameters of the constitutive equations, of the thermal and friction models using specific experimental tests or using an inverse analysis on the drawing process. These parameters are validated by analysing other tube drawings. Finally the importance of physical parameters fit on drawing limits is emphasised, using a Cockcroft-Latham failure criterion.

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“…While it is widely acknowledged that one of the main effects of cold extrusion on the billet material is strain hardening, other mechanical characteristics of the extruded material also change. Using both experimental and finite element analysis, some researchers have analysed the hardness and density changes that occurred as a result of both the extrusion and drawing process [8]. Experimental investigations have been made to determine the effects of die reduction ratio, die angle and loading rate on the quality of cold extruded parts, extrusion pressures and flow patterns for both lead and aluminium [9].…”

Section: Introductionmentioning

confidence: 99%