Fundamental issues in hydroforming of deep drawing processes

The wide spectrum of recent improvements in hydroforming deep drawing processes is descried here briefly. New accomplishments were seemingly achieved as soon as the sheet forming industry has found their cost-effectiveness. Some fundamental results and their physical motives are presented, based on an idealized limit-analysis formulation (lower bound approach in this case). The mathematical complexities frequently encountered in more precise solutions are thus avoided, though they had been established as (partially) appeared in the reference list.