Study of influence of superimposed hydrostatic pressure on bendability of sheet metals

The effect of superimposed hydrostatic pressure on the bendability of sheet metal is investigated using the finite element method employing the Gurson-Tvergaard-Needleman (GTN) model. It is shown that bendability and fracture strain increase significantly by imposing hydrostatic pressure as it delays the growth and coalescence of microvoids but it has insignificant effect on void nucleation using the GTN model, which is strain controlled for …