Numerical simulation of the drawing process of tungsten wires

Weygand, Sabine M.; Riedel, Hermann; Eberhard, B; Wouters, G.

doi:10.1016/j.ijrmhm.2005.10.010

Cited by 14 publications

(7 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…longitudinal cracks and knife-edge-necking of individual grains. The longitudinal cracks are driven by circumferential stresses caused by the drawing of the wire [43,44]. As the maximum circumferential stress occurs at the surface this explains also why the cracks originate at the surface.…”

Section: Fracture Modesmentioning

confidence: 97%

Microstructure, mechanical behaviour and fracture of pure tungsten wire after different heat treatments

Zhao

Riesch

Höschen

et al. 2017

International Journal of Refractory Metals and Hard Materials

View full text Add to dashboard Cite

Plastic deformation of tungsten wire is an effective source of toughening tungsten fibre-reinforced tungsten composites (Wf/W) and other tungsten fibre-reinforced composites. To provide a reference for optimization of those composites, unconstrained pure tungsten wire is studied after various heat treatments in terms of microstructure, mechanical behaviour and fracture mode. Recrystallization is already observed at a relatively low temperature of 1273 K due to the large driving force caused by a high dislocation density. Annealing for 30 minutes at 1900 K also leads to recrystallization, but causes a rather different microstructure. As-fabricated wire and wire recrystallized at 1273 K for 3 hours show fine grains with a high aspect ratio and a substantial plastic deformability: a clearly defined tensile strength, high plastic work, similar necking shape, and the characteristic knife-edge-necking of individual grains on the fracture surface. While the wire recrystallized at 1900 K displays large, almost equiaxed grains with low aspect ratios as well as distinct brittle properties. Therefore, it is suggested that a high aspect ratio of the grains is important for the ductile behaviour of tungsten wire and that embrittlement is caused by the loss of the preferable elongated grain structure rather than by recrystallization. In addition, a detailed evaluation of the plastic deformation behaviour during tensile test gives guidance to the design and optimization of tungsten fibre-reinforced composites.

show abstract

Section: Fracture Modesmentioning

confidence: 97%

Microstructure, mechanical behaviour and fracture of pure tungsten wire after different heat treatments

Zhao

Riesch

Höschen

et al. 2017

International Journal of Refractory Metals and Hard Materials

View full text Add to dashboard Cite

show abstract

“…and simulation results indicate that the remaining tension after drawing as well as the friction between die and wire are responsible for such defects. 17,18 As already mentioned (see fig.2), die-less drawing offers the possibility of a thermomechanical treatment during the process 1 which could improve the quality of such wires. Additionally, the number of drawing operations can be reduced due to the improved forming capabilities of the die-less drawing process 10 which in turn, can help to improve the surface quality, too.…”

Section: Theoretical Considerations and Previous Workmentioning

confidence: 93%

“…17 During production in conventional wire drawing the wire passes several dies and can acquire a varying number of longitudinal cracks. 17,18 Drawing of tungsten wires has been simulated by Weygand et. al.…”

Section: Theoretical Considerations and Previous Workmentioning

confidence: 99%

Dieless wire drawing with lasers

Liedl¹,

Schuöcker²

2007

International Conference on Lasers, Applications, and Technologies 2007: High-Power Lasers and Applications

View full text Add to dashboard Cite

Thin wires are produced by drawing through nozzle-like tools, so called dies, that suffer from strong wear due to friction. In order to avoid the latter disadvantage the dies can be replaced by a laser beam heating the wire to such extend that the yield strength becomes smaller than the tensile strength and thus the wire is elongated and consequently constricted. To avoid rupture, the wire is cooled down again after the desired reduction of the diameter is reached. A further important advantage of this new process is that only one drawing step with a laser can substitute a large number of mechanical drawing actions, thus making the process much more efficient. Theoretical considerations and experimental investigations prove the feasibility of the latter new laser process and are subject to a description in the actual paper.

show abstract

“…In the work of McAllen and Phelan [6], they presented a modified damage model that was implemented into a finite element model using a Fortran subroutine that enabled the analysis of the occurrence of central burst defects in single and multipass wire drawing operations. Weygand et al [7] demonstrated the influence of residual stresses in the occurrence of longitudinal cracks (splits) in tungsten wires.…”

Section: Introductionmentioning

confidence: 99%

Guidelines for Selecting Plugs Used in Thin-Walled Tube Drawing Processes of Metallic Alloys

Rubio¹,

Camacho²,

Pérez³

et al. 2017

Metals

View full text Add to dashboard Cite

Abstract:In this paper, some practical guidelines to select the plug or set of plugs more adequate to carry out drawing processes of thin-walled tubes carried out with fixed conical inner plug are presented. For this purpose, the most relevant input parameters have been considered in this study: the tube material, the most important geometrical parameters of the process (die semiangle, α, and cross-sectional area reduction, r) and the friction conditions (Coulomb friction coefficients, µ 1 , between the die and the tube outer surface, and µ 2 , between the plug and the tube inner surface). Three work-hardening materials are analyzed: the annealed copper UNS C11000, the aluminum UNS A91100, and the stainless steel UNS S34000. The analysis is realized by means of the upper bound method (UBM), modelling the plastic deformation zone by triangular rigid zones (TRZ), under the validated assumption that the process occurs under plane strain conditions. The obtained results allow establishing, for each material, a group of geometrical parameters, friction conditions, a set of plugs that make possible to carry out the process under good conditions, and the optimum plug to carry out the process using the minimum amount of energy. The proposed model is validated by means of an own finite element analysis (FEA) carried out under different conditions and, in addition, by other finite element method (FEM) simulations and real experiments taken from other researchers found in the literature (called literature simulations and literature experimental results, respectively). As a main conclusion, it is possible to affirm that the plug that allows carrying out the process with minimum quantity of energy is cylindrical in most cases.

show abstract

Numerical simulation of the drawing process of tungsten wires

Cited by 14 publications

References 4 publications

Microstructure, mechanical behaviour and fracture of pure tungsten wire after different heat treatments

Microstructure, mechanical behaviour and fracture of pure tungsten wire after different heat treatments

Dieless wire drawing with lasers

Guidelines for Selecting Plugs Used in Thin-Walled Tube Drawing Processes of Metallic Alloys

Contact Info

Product

Resources

About