Gradient damage models in metal forming problems

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

Authors

José Manuel A. César de Sá (Author) FEUP; Pedro Miguel A. Areias (Author) FEUP; Francisco M. Andrade Pires (Author) FEUP; Cai Zheng (Author) FEUP

Conference proceedings International

Title: Materials Processing and Design: Modeling, Simulations and Applications

Pages: 1932-1937

NUMIFORM

13th –17th June

Scientific classification

FOS: Engineering and technology > Mechanical engineering

CORDIS: Technological sciences > Engineering > Mechanical engineering

Other information

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 for situations involving complex strain paths.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6