Rupture instability in hydroforming deep-drawing process

Experimental and numerical study of stamp hydroforming of sheet metals

“…The second challenge is the relationship between the uid pressure and the punch stroke during the process. As shown by Yossifon and Tirosh [6][7][8][9][10] uid pressures within the upper uid chamber that are too high will cause the material to bend to the radius of curvature of the punch much faster than the ductility of the material may allow. This will lead to premature rupturing of the sheet metal.…”

A simple method to determine pressure curve for sheet hydro-forming and experimental verification

“…During the study of previous works [3][4][5], an interesting fact has been recognized that the shapes of the optimal pressure curve are always monotonically increased with respect to punch stroke. The reason why the shape of the pressure curve is monotonically increasing is attributable to the nature of the hydro-forming process itself, because radii of curvature at the edges of hydro-formed product are always decreasing during the forming stage in order to get a detailed trace of die shape.…”

“…Yossifon et al [2] derived a theoretical relationship for wrinkling for axisymmetric hydro-forming. Yossifon and Tirosh [3] considered normal anisotropy in the analysis of the instability in hydro-forming.…”

A study on the analytical modeling for warm hydro-mechanical deep drawing of lightweight materials

“…(1) results in the following relations: _ t ¼ À ðs r þ s y Þ ð1 þRÞs y ÀRs r vt r . (11) By using the finite difference method as a slight extension of the incremental strain theory proposed by Yamada [7], the detailed computational scheme accounting for the effect of BHP can be developed. Therefore, basic Eqs.…”

“…Yossifon et al [11] developed critical fluidpressure locus where rupture may occur by tensile instability during hydro-mechanical deep drawing. Koc [12] studied the process limits and parameters for tube hydroforming by applying plasticity, membrane and thin-thick walled tube theories.…”