Deformation characteristics and formability enhancement during ultrasonic-assisted multi-stage incremental sheet forming

• DOI: 10.1016/j.jmrt.2022.03.036
• Publication Date: 2022-03-10T16:59:16Z
• Authors: Shahid Ghafoor; Yanle Li; Ganglin Zhao; Jinhui Li; Irfan Ullah; Fangyi Li
• Keywords: Incremental sheet forming

Although the multi-stage incremental sheet forming strategy is beneficial for manufacturing complex geometrical shapes via objective transitional stages, limit and geometric accuracy are highly dependent on intermediate shapes, which need further improvement. Therefore, a novel by combining with ultrasonic-assisted vibration (UV) was proposed in present work. This paper investigates effect of ultrasonic vibrations forces, thickness distribution, stress–strain distribution through experimental tests finite element (FE) simulations. Initially, series were conducted to determine three strategies based parameters including depth, initial diameter, angle, both without assistance UV. Afterward, FE model established ABAQUS/Explicit optimal adopting modified crystal plasticity constitutive model. The results indicated that, after superimposing vibration, forces effectively reduced plastic deformation greatly improved due increased equivalent strain. Meanwhile, application UV field efficiently reduces high-stress zones significantly decreases stress value. Finally, it discovered that imposing at appropriate formability can be successfully improved. investigation well understand affecting mechanism completing technique obtaining enhanced formability.