Approximate model to calculate foldover and strains during cold upsetting of cylinders. Part I. Formulation and evaluation of the foldover model

Osama M. Ettouney; Kim A. Stelson

Approximate model to calculate foldover and strains during cold upsetting of cylinders. Part I. Formulation and evaluation of the foldover model

Osama M. Ettouney
, Kim A. Stelson

Mechanical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

In this paper, a new approximate model to calculate foldover of a cylinder undergoing nonuniform compression test (simple upsetting) is presented. The model is formulated using constant-volume equations and workpiece geometry. In addition to foldover, the model can be used to calculate equatorial-axial strains. This eliminates the need for inscribing grids (when determining forming-limit diagrams) on the cylinder's free surface to find these strains. Combined with friction-calibration curves (prepared using finite-element analysis) that relate foldover to friction, the model enables one to estimate the friction coefficient. This eliminates the need for a separate test (e.g. the ring test) to determine friction or evaluate type of lubrication to be used. When compared to finite-element results and experiments, the new model showed excellent results in calculating foldover, strains and friction coefficient.

Original language	English (US)
Title of host publication	Computer Modeling and Simulation of Manufacturing Processes
Editors	B. Singh, Y.T. Im, I. Haque, C. Altan
Publisher	Publ by ASME
Pages	165-179
Number of pages	15
Volume	20
State	Published - Dec 1 1990
Event	Winter Annual Meeting of the American Society of Mechanical Engineers - Dallas, TX, USA Duration: Nov 25 1990 → Nov 30 1990

Other

Other	Winter Annual Meeting of the American Society of Mechanical Engineers
City	Dallas, TX, USA
Period	11/25/90 → 11/30/90

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Approximate model to calculate foldover and strains during cold upsetting of cylinders. Part I. Formulation and evaluation of the foldover model. / Ettouney, Osama M.; Stelson, Kim A.
Computer Modeling and Simulation of Manufacturing Processes. ed. / B. Singh; Y.T. Im; I. Haque; C. Altan. Vol. 20 Publ by ASME, 1990. p. 165-179.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Ettouney, OM & Stelson, KA 1990, Approximate model to calculate foldover and strains during cold upsetting of cylinders. Part I. Formulation and evaluation of the foldover model. in B Singh, YT Im, I Haque & C Altan (eds), Computer Modeling and Simulation of Manufacturing Processes. vol. 20, Publ by ASME, pp. 165-179, Winter Annual Meeting of the American Society of Mechanical Engineers, Dallas, TX, USA, 11/25/90.

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abstract = "In this paper, a new approximate model to calculate foldover of a cylinder undergoing nonuniform compression test (simple upsetting) is presented. The model is formulated using constant-volume equations and workpiece geometry. In addition to foldover, the model can be used to calculate equatorial-axial strains. This eliminates the need for inscribing grids (when determining forming-limit diagrams) on the cylinder's free surface to find these strains. Combined with friction-calibration curves (prepared using finite-element analysis) that relate foldover to friction, the model enables one to estimate the friction coefficient. This eliminates the need for a separate test (e.g. the ring test) to determine friction or evaluate type of lubrication to be used. When compared to finite-element results and experiments, the new model showed excellent results in calculating foldover, strains and friction coefficient.",

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language = "English (US)",

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editor = "B. Singh and Y.T. Im and I. Haque and C. Altan",

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note = "Winter Annual Meeting of the American Society of Mechanical Engineers ; Conference date: 25-11-1990 Through 30-11-1990",

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N2 - In this paper, a new approximate model to calculate foldover of a cylinder undergoing nonuniform compression test (simple upsetting) is presented. The model is formulated using constant-volume equations and workpiece geometry. In addition to foldover, the model can be used to calculate equatorial-axial strains. This eliminates the need for inscribing grids (when determining forming-limit diagrams) on the cylinder's free surface to find these strains. Combined with friction-calibration curves (prepared using finite-element analysis) that relate foldover to friction, the model enables one to estimate the friction coefficient. This eliminates the need for a separate test (e.g. the ring test) to determine friction or evaluate type of lubrication to be used. When compared to finite-element results and experiments, the new model showed excellent results in calculating foldover, strains and friction coefficient.

AB - In this paper, a new approximate model to calculate foldover of a cylinder undergoing nonuniform compression test (simple upsetting) is presented. The model is formulated using constant-volume equations and workpiece geometry. In addition to foldover, the model can be used to calculate equatorial-axial strains. This eliminates the need for inscribing grids (when determining forming-limit diagrams) on the cylinder's free surface to find these strains. Combined with friction-calibration curves (prepared using finite-element analysis) that relate foldover to friction, the model enables one to estimate the friction coefficient. This eliminates the need for a separate test (e.g. the ring test) to determine friction or evaluate type of lubrication to be used. When compared to finite-element results and experiments, the new model showed excellent results in calculating foldover, strains and friction coefficient.

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BT - Computer Modeling and Simulation of Manufacturing Processes

A2 - Singh, B.

A2 - Im, Y.T.

A2 - Haque, I.

A2 - Altan, C.

PB - Publ by ASME

T2 - Winter Annual Meeting of the American Society of Mechanical Engineers

Y2 - 25 November 1990 through 30 November 1990

ER -

Approximate model to calculate foldover and strains during cold upsetting of cylinders. Part I. Formulation and evaluation of the foldover model

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