Volume effect preparatory research of vibrational rotary forging

As lack of a efficiency theoretical approximate solution for the volume effect mechanism analyzed during continuing and local vibrational plastic deformation process, according to vibrational rotary forging deforming characters, a three-dimension visco-elasticity plasticity constitutive equation was built by Kelvin model and Liewei-Mises model. After this constitutive equation was to be matrixing and to be introduced to tetrahedral solid elements, a visco-elasticity spatial stiffness matrix and a visco-plasticity spatial stiffness matrix were respectively derived. According to experimental parameters given, some simulation experimental projects were designed, a FEM models were established, and some FEM experiments were done on condition that amplitude and vibrational frequency were respectively changed, then different normal load-time curves were obtained. It is shown from experiment results that volume effect will appear during vibrational rotary forging forming process with low frequency, the volume effect strength is related to the amplitude and the frequency, and this effect generation should be in special conditions, then preparatory research of volume effect mechanism of continuing and local vibrational plastic deforming process.