Investigation on the Formability of a Tube in Pulsating Hydroforming
Based on the finite element simulation of tube-hydroforming process with pulsating internal pressure, the influence of the pressure increment p and the time increment t of the pulsating pressure upon the formability of a tube have been investigated by analyzing and comparing the four formability indicators such as thickness distribution, die-filling ability, wall thickness uniformity and potential fracturing. A new indicator f is proposed to estimate the formability of a tube on the basis of the finite element analysis (FEA). The results show that: the indicator f can reasonably reflect the combination formability of a tube in hydroforming including the die-filling ability, the wall-thickness uniformity and the deformation reliability; the p and t values have different influence on the four formability indicators as mentioned above; the smaller the p and t values or the more the internal pressure pulsates during the forming process, the better the combination formability of the tube would be.
Dongming Guo, Jun Wang, Zhenyuan Jia, Renke Kang, Hang Gao, and Xuyue Wang
L. F. Yang and F. J. Chen, "Investigation on the Formability of a Tube in Pulsating Hydroforming", Materials Science Forum, Vols. 628-629, pp. 617-622, 2009