Application of a shear-modified GTN model to incremental sheet forming

This paper investigates the effects of using a shear-modified Gurson-Tvergaard-Needleman model, which is based on the mechanics of voids, for simulating material behavior in the incremental forming process. The problem chosen for analysis is a simplified version of the NUMISHEET 2014 incremental for...

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Bibliographic Details
Main Authors: Smith, Jacob, Malhotra Rajiv, Liu, W K, Cao Jian
Format: Conference Proceeding
Language:English
Subjects:
Calibration
Computer simulation
Finite element method
Forming techniques
Mathematical models
Shear
Tensile tests
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Summary:This paper investigates the effects of using a shear-modified Gurson-Tvergaard-Needleman model, which is based on the mechanics of voids, for simulating material behavior in the incremental forming process. The problem chosen for analysis is a simplified version of the NUMISHEET 2014 incremental forming benchmark test. The implications of the shear-modification of the model specifically for incremental sheet forming processes are confirmed using finite element analysis. It is shown that including the shear term has a significant effect on fracture timing in incremental forming, which is not well reflected in the observed tensile test simulations for calibration. The numerical implementation and the need for comprehensive calibration of the model are briefly discussed.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4850097