Damage prediction in single point incremental forming using an extended Gurson model

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:151

Article; Proceedings Paper

Felipe Guzman, Carlos¹  Yuan, Sibo²  Duchene, Laurent²  Saavedra Flares, Erick I.¹  Habraken, Anne Marie² 

[1] Univ Santiago Chile, Dept Ingn Obras Civiies, Av Ecuador 3659, Santiago, Chile

[2] Univ Liege, Dept ArGEnCo, Quartier Polytech 1, Alle Decouverte 9, B-4000 Liege, Belgium

关键词: Single point incremental forming;    Ductile Fracture;    Gurson model;    Finite element method;   

DOI  :  10.1016/j.ijsolstr.2017.04.013

来源: Elsevier

【 摘 要 】

Single point incremental forming (SPIF) has several advantages over traditional forming. such as the high formability attainable by the material. Different hypotheses have been proposed to explain this behavior, but there is still no straightforward relation between the particular stress and strain state induced by PIE and the material degradation leading to localization and fracture. A systematic review of the state of the art about formability and damage in SPIF is presented and an extended Gurson-Tvergaard-Needleman (GTN) model was applied to predict damage in SPIF through finite element (FE) simulations. The line test was used to validate the simulations by comparing force and shape predictions with experimental results. To analyze the failure prediction. several simulations of SPIF cones at different wall angles were performed. It is concluded that the GTN model underestimates the failure angle on SPIF due to wrong coalescence modeling. A physically-based Thomason coalescence criterion was then used leading to an improvement on the results by delaying the onset of coalescence. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

Free