Application of the 2D finite element method to simulation of cold-forging processes

Altan, Taylan; Knoerr, Markus

doi:10.1016/0924-0136(92)90323-k

Cited by 44 publications

(10 citation statements)

References 4 publications

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“…During the 1980s, the flow formulation was primarily set up for modeling two-dimensional bulk forming processes and such efforts gave rise to the development of a first generation of commercial software with applicability limited to plane strain and axisymmetric conditions. Even so, authors such as Altan and Knoerr [10] were able to report case studies in which the two-dimensional constraint was ingeniously stretched out in order to obtain useful information regarding three-dimensional metal forming applications.…”

Section: State-of-the-artmentioning

confidence: 97%

Coupled Finite Element Flow Formulation

Nielsen

Zhang²,

Alves

et al. 2012

Modeling of Thermo-Electro-Mechanical Manufacturing Processes

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Section: State-of-the-artmentioning

confidence: 97%

Coupled Finite Element Flow Formulation

Nielsen

Zhang²,

Alves

et al. 2012

Modeling of Thermo-Electro-Mechanical Manufacturing Processes

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“…Furthermore, since the topography of these features can undergo significant changes, the influence of contact area and self-contact (where portions of the MMT-TIM structure come into contact with other initially noncontacting parts) during compression on the effective thermal resistance and thermal conductivity of the MMT-TIMs must also be characterized, A commercial finite element (FE) package called DEFORM (Scientific Forming Technologies Corporation) was used to simultaneously model the large plastic defoimations as well as the bulk thermal response of the MMT-TIMs as they undergo large topographic changes during compression. This package was designed for modeling high-strain operations such as forging, rolling, and extrusion and thus is well suited towards modeling the large plastic deformations inherent to this study [12][13][14], While an entire MMT-TIM may consist of an array of many features, here the numerical model simulated a unit-cell consisting of a single MMT-TIM feature with the appropriate boundary conditions, A representation of a MMT-TIM unit-cell bounded by the two contacting bodies is shown in Fig, 2,…”

Section: Modelingmentioning

confidence: 99%

Modeling and Experimental Characterization of Metal Microtextured Thermal Interface Materials

Kempers

Lyons

Robinson

2013

Journal of Heat Transfer

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A metal mierotextured thermal interface material (MMT-TIM) has been proposed to address some of the shortcomings of conventional TIMs. These materials consist of arrays of small-scale metal features that plastically deform when compressed hetu'een mating surfaces, conforming to the surface asperities of the contacting bodies and resulting in a low-thermal resistance assembly. The present work details the development of an accurate thermal model to predict the thermal resistance and effective thermal conductivity of the assembly (including contact and bulk thermal properties) as the MMT-TlMs undergo large plastic deformations. The main challenge of characterizing the thermal contact resistance of these structures was addressed by employing a numerical model to characterize the bulk thermal resistance and estimate the contribution of thermal contact resistance. Furthermore, a correlation that relates electrical and thermal contact resistance for these MMT-TIMs was developed that adequately predicted MMT-TIM properties for several different geometries. A comparison to a commercially available graphite TIM is made as well as suggestions for optimizing future MMT-TIM designs.

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“…Many numerical studies have been performed on the radial forging process. Domblesky et al [6] and Altan et al [7] used a two-dimensional (2D) axisymmetric finite element model to investigate the mechanical and thermal behavior of the process. These models do not fully account for temperature-dependent material properties and circumferential effects such as rotational feed and clearance between dies.…”

Section: Introductionmentioning

confidence: 99%