Stress based prediction of formability and failure in incremental sheet forming

Haque, Md Ziaul and Yoon, Jeong Whan 2016, Stress based prediction of formability and failure in incremental sheet forming, International journal of material forming, vol. 9, no. 3, Thematic Issue, pp. 413-421, doi: 10.1007/s12289-015-1237-8.

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Title Stress based prediction of formability and failure in incremental sheet forming
Author(s) Haque, Md Ziaul
Yoon, Jeong WhanORCID iD for Yoon, Jeong Whan
Journal name International journal of material forming
Volume number 9
Issue number 3
Season Thematic Issue
Start page 413
End page 421
Total pages 9
Publisher Springer
Place of publication Berlin, Germany
Publication date 2016-07
ISSN 1960-6206
Keyword(s) stress-based forming limit
Summary A strain-based forming limit criterion is widely used in sheet-metal forming industry to predict necking. However, this criterion is usually valid when the strain path is linear throughout the deformation process [1]. Strain path in incremental sheet forming is often found to be severely nonlinear throughout the deformation history. Therefore, the practice of using a strain-based forming limit criterion often leads to erroneous assessments of formability and failure prediction. On the other hands, stress-based forming limit is insensitive against any changes in the strain path and hence it is first used to model the necking limit in incremental sheet forming. The stress-based forming limit is also combined with the fracture limit based on maximum shear stress criterion to show necking and fracture together. A derivation for a general mapping method from strain-based FLC to stress-based FLC using a non-quadratic yield function has been made. Simulation model is evaluated for a single point incremental forming using AA 6022-T43, and checked the accuracy against experiments. By using the path-independent necking and fracture limits, it is able to explain the deformation mechanism successfully in incremental sheet forming. The proposed model has given a good scientific basis for the development of ISF under nonlinear strain path and its usability over conventional sheet forming process as well.
Language eng
DOI 10.1007/s12289-015-1237-8
Field of Research 091207 Metals and Alloy Materials
Socio Economic Objective 861199 Basic Metal Products (incl. Smelting
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Springer
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