Prediction of plastic instability in sheet metal forming using finite element method

• Type: Article in International Conference Proceedings Book
• Date: 2008

Authors

José Manuel de Almeida César de Sá (Author) FEUP; Pedro Manuel CardosoTeixeira (Author) FEUP; Abel Dias dos Santos (Author) FEUP; Francisco Manuel Andrade Pires (Author) FEUP; Augusto Duarte Campos Barata da Rocha (Author) FEUP

Conference proceedings International

Title: ICTP 2008 - The 9th International Conference on Technology of Plasticity

Pages: 1234-1245

Gyeongju, South Korea, 7 a 11 de Setembro de 2008

Indexing

ISI Proceedings

Scopus

Scientific classification

FOS: Engineering and technology > Mechanical engineering

CORDIS: Technological sciences > Engineering > Mechanical engineering

Other information

Abstract (EN): The introduction of new materials brought new challenges to sheet metal forming processes. The optimization of these processes by using numerical simulations has become a key factor to a continuously increasing requirement for time and cost efficiency, for quality improvement and materials saving, in many manufacturing areas such as automotive, aerospace, building, packaging and electronic industries. The behaviour observed with conventional steels may not be applied when using high-strength steels or aluminium alloys. Numerical codes need to model correctly the material and different constitutive equations must be considered to describe with greater accuracy its behaviour. This enhancement of material description may provide a better prediction of the forming limits, enabling an assessment of the influence of each forming parameter on the necking occurrence and the improvement of press performance. This paper presents two numerical approaches for failure prediction in sheet metal forming operations: one is the traditional use of FLDs, usually employed as an analysis of the finite element solution in which the necking phenomenon is carried out in the framework of Marciniak-Kuczynski (M-K) analysis coupled with the conventional theory of plasticity and the other is the implementation of a ductile damage model in a commercial code in accordance with the theory of Continuum Damage Mechanics. The previous strategies and corresponding results are compared with experimental failure cases, in order to test and validate each of these strategies.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 12