Mandrel drawing and plug drawing of shape-memory-alloy fine tubes used in catheters and stents

Yoshida, Kazunari; Furuya, Hiroaki

doi:10.1016/j.jmatprotec.2004.04.182

Cited by 61 publications

(42 citation statements)

References 3 publications

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“…However, since deformation of material in the experiments for getting the forming limit diagram is not always similar to the deformation of material in the bulk metal industries, obtaining the forming limit in various strain paths is not always useful in industrial applications. Thus, several researches have been developed in order to predict and determine the formability limit in each special bulk metalworking processes, such as in bar drawing (Oh et al 1979), extrusion (Vujovic et al 1986), ironing process (Schmid et al 1982) and tube drawing (Yoshida et al 2004). Oh et al (1979) studied the workability or, in other word, the formability limit of materials in bar extrusion and drawing processes based on ductile fracture theory and the deformation mechanism.…”

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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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

View full text Add to dashboard Cite

show abstract

“…This criterion is independent of tube outer diameter and tube thickness. It is function of mechanical properties of material [14], of geometry and type of die and mandrel [10], and process parameters (i.e. friction coefficients and temperature conditions) [14].…”

Section: Methodsmentioning

confidence: 99%

“…Recently, they used the same approach to determine the drawing limit of the AA-6061-T6 tube [9]. Yoshida et al [10] used the drawing tests to determine experimentally the drawing limit for one pass for various tube drawing methods: fixed plug drawing, floating plug drawing, mandrel drawing and hollow sinking (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

“…They showed that the drawing limit depends on the tube drawing methods and the drawing limit of the mandrel drawing method was the highest. The methodology proposed in Yoshida et al [10] is time consuming because it needs several experiments using different die or plug dimensions and/or using different tube dimensions to determine the drawing limit of tubes. In addition, the conventional method for determination of drawing limit does not give always the accurate results.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 1. Four types of tube drawing [10] In this study, with a modification made to the classical tube drawing method, the drawing limit in one pass of the process can be determined using the position controlled plug technique. The method proposed in this paper determines the drawing limit for each tube dimension with just one experiment.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A New Method for the Determination of Formability Limit in the Tube Drawing Process

Bui

Bihamta

Guillot

et al. 2011

Supplemental Proceedings

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Mechanical property analysis of Nitinol defective stent under uniaxial loading/unloading

Zhi

Wang

Gao

et al. 2008

Materialwissenschaft Werkst

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The vascular stents are important medical devices introduced into a vessel to protect the lumen from unfriendly stenosis. However, Nitinol stent is easy to fail in practice. The present paper focuses on the influence of defects on its mechanical behavior by finite element analysis. The essential stent cell is used with two different type of defects, which includes the face bulge defect resulted from laser burrs or TiC inclusion arises and C-contained particle voids. Auricchio's super-elastic consititutive equations are used in the finite element simulations. It is found that the stress distribution is not only related to the defect type but also to the defect position. With the increasing distance from the TiC defect to the knot's notch, the influence of defects on stress distribution of stents becomes small. For void defects, those near both the inner fillet and the outer fillet have grand influence on the stent's global stress distribution. In particular, the higher stress concentrations are undergone near knot's defects. For all models, the maximum Martensite Volume Fraction is near knots. The finite element analysis shows that cracks/fractures can easily appear near knots. A stent with a TiC inclusion or void defect is likely to fail. All obtained conclusions can be useful to design against stent premature mechanical failure.

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Mandrel drawing and plug drawing of shape-memory-alloy fine tubes used in catheters and stents

Cited by 61 publications

References 3 publications

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

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

A New Method for the Determination of Formability Limit in the Tube Drawing Process

Mechanical property analysis of Nitinol defective stent under uniaxial loading/unloading

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