Modeling the strain localization of shell elements subjected to combined stretch–bend loads : Application on automotive sheet metal stamping simulations

• This study presents a modeling approach for predicting strain localization during sheet metal stamping processes focused on automotive engineering applications. The so-called stretching-to-bending ratio, ρ, is proposed to characterize the loading conditions acting on an element during stamping processes. Then, localized strain or necking strain is suggested to be a function of ρ. Different stretch–bending tests with different tool radii, i.e., R3, R6, R10, and R50 are conducted for two automotive sheet metals, DP800 and AA6010, to identify their forming limits under combined stretch–bend loads. The calibrated necking limit curve of the AA6016 sheet is then employed in AutoForm R10 software to predict the necking and failure of a stamped panel. Agreement with the experimental observation of failure positions of the panel validates the usefulness of the proposed modeling approach in practice. 

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Maskinteknik -- Teknisk mekanik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Mechanical Engineering -- Applied Mechanics (hsv//eng)

Keyword

Automotive sheet metal

Shell element

Strain localization

Stretch–bending load

Through-thickness strain gradient

Ductile fracture

Sheet metal

Stamping

Automotive sheet metals

Bending load

Strain gradients

Strain localizations

Stretch-bending

Thickness strain

Through-thickness

Bending tests

Publication and Content Type

ref (subject category)

art (subject category)