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•    Author: Krishna Kumar Saxena,  Jyoti Mukhopadhyay, Klaus Drotleff

•    Author's Company:  Indian Institute of Technology, University of Stuttgart

•    Title:  Design of New Punch Geometries for Generation of Non-Linear Strain Paths and Formability Evaluation

•    Volume:  Vol. 73, No. 6

•    Year:  2015

•    No. Pages:  4

•    Description:  It is an important requirement for the automotive industry to assess the formability of aluminum alloys so that body panels can be successfully formed without failure. Formability of automotive sheet materials is assessed by a forming limit curve (FLC), a graphical tool which depicts what combination of major to minor strains can be applied on sheet metal so as to get safe forming. The standard FLCs, which are either obtained from experiments or calculated using a mathematical model, are all under the assumption of simple loading states. Therefore, they fail to provide proper results when strain paths in the sheet metal are non-linear. Non-linear strain paths are common in forming processes that involve complex tool geometries or multi-stage forming operations or in forming parts with tool geometries that come into contact with one another in a later stage of forming processes. Conventionally, the non-linear strain paths are achieved experimentally by a two-step process. This paper presents a single step experimental approach to detect forming limits considering non-linear strain paths, which is achieved by designing new punch geometries.

Product Code: DES0ZX0F26