## 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) |
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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 |
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City | Dallas, TX, USA |

Period | 11/25/90 → 11/30/90 |