Abstract
The investigation of bendability of sheet metal alloys is of great importance for the evaluation of process robustness in production of hemmed sheet metal assemblies. Furthermore, material cracks due to bending can also occur at deep drawing operations. This contribution focuses on the experimental determination of material’s formability at deep drawing, the characterisation of bendability especially for hemming operations and the determination of formability under combined deep drawing and bending loads, respectively.
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Abbreviations
- BLC:
-
bending limit diagram
- FLC:
-
forming limit curve
- FLD:
-
forming limit diagram
- M:
-
correlation function for combined load conditions
- r i :
-
inner bending radius
- α :
-
strain path orientation
- β :
-
bending indicator
- ϕ 1 :
-
major strain
- ϕ 1,1 :
-
major strain of pre-strain
- ϕ 1,res :
-
major strain of pre-strain inclusive subsequent bending
- ϕ2 :
-
minor strain
- ϕb :
-
bending strain (outer fiber)
- ϕ 1,planar :
-
major strain component of planar forming limit description
- ϕ M :
-
major forming limit strain component for combined load conditions
- \(\overline{\overline {\varphi _b }} \) :
-
strain tensor for bending operations
- \(\overline{\overline {\varphi _d }} \) :
-
strain tensor for deep drawing operations
- \(\overline{\overline \varphi } \) :
-
strain tensor for all possible states of strain
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Schleich, R., Sindel, M. & Liewald, M. Investigation on the effect of curvature on forming limit prediction for aluminium sheet alloys. Int J Mater Form 2, 69–74 (2009). https://doi.org/10.1007/s12289-009-0394-z
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DOI: https://doi.org/10.1007/s12289-009-0394-z