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02-01-2020 | Production Process | Issue 1/2020

Production Engineering 1/2020

Influence of anisotropic damage evolution on cold forging

Journal:
Production Engineering > Issue 1/2020
Authors:
Kai Langenfeld, Alexander Schowtjak, Robin Schulte, Oliver Hering, Kerstin Möhring, Till Clausmeyer, Richard Ostwald, Frank Walther, A. Erman Tekkaya, Jörn Mosler
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Abstract

This contribution deals with the influence of anisotropic material degradation (damage) within numerical simulations of cold forging. For that purpose, two constitutive frameworks for modeling ductile damage are presented: an isotropic and an anisotropic model. In a first step, both models are calibrated based on a uniaxial tensile test. Then, the forward rod extrusion process is simulated with the isotropic model. The deformation of a characteristic element is transferred to the anisotropic model and the local response is investigated. Both models are compared to one another in terms of the process induced ductile damage. It will be shown, that the magnitude of the induced damage agrees reasonably well, but that the orientation of ductile damage is of major importance.

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