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Characterisation of Sheet Metal Formability – A Review and New Approaches
Author(s) -
Liewald Mathias,
Held Christian,
Schleich Ralf
Publication year - 2009
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.2374/sri09sp005
Subject(s) - formability , sheet metal , materials science , hardening (computing) , shear (geology) , forming limit diagram , strain hardening exponent , bending , material properties , structural engineering , tola , composite material , engineering , layer (electronics)
This paper gives a historical overview of techniques of characterising sheet metal material behaviour. First it reviews the evolution of yield criteria in the past, hardening laws and failure‐prediction methods based on comprehensive time tables. After that, it demonstrates some shortcomings of today's material characterisation such as the impact of strain induced texture changes on material characterisation. Then the lecture shows further approaches to a more adequate description of material behaviour with regard to biaxial stress conditions and a new failure criterion for sheet metal bending processes, the so called Bending Limit Curve (BLC) concept. It also presents a new testing method for pure shear and simultaneous tension and shear loading as well as further approaches to understand material behaviour.