Gradient damage models in metal forming problems

• Type: Article in International Conference Proceedings Book
• Date: 2004

Authors

José César de Sá (Author) FEUP; Pedro Miguel Areias (Author) Other; Francisco M. Andrade Pires (Author) FEUP; C. Zheng (Author) Other

Conference proceedings International

Title: MATERIALS PROCESSING AND DESIGN: MODELING, SIMULATION AND APPLICATIONS, PTS 1 AND 2

Pages: 1932-1937

8th International Conference on Numerical Methods in Industrial Forming Processes

Columbus, OH, JUN 13-17, 2004

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ISI Web of Knowledge - 0 Citations

Other information

Authenticus ID: P-000-D6M

DOI: 10.1063/1.1766816

Abstract (EN): Reliable metal forming predictions require that fracture indication be available both in processes where it should be avoided and in processes in which fracture is a part of the process itself as in sheet blanking or metal cutting. The present proposal circumvents the necessity of the so-called "fracture indicators" or fracture criteria by representing fracture through the material model exclusively. The frequent objections to this otherwise attractive are mainly related to the observed defect of mesh dependency. To attenuate this dependency an implicit gradient damage model is used. Therefore a non-local damage field is introduced, which can be related to a local damage field, by means of a Helmholtz type differential equation. The damage evolution law is based on the improved Lemaitre damage model that treats differently the compressive and tensile response, which is particularly adequate forsituations; involving complex strain paths.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6