2012
EMSS 2012 Proceeding
Modeling and simulation based on inverse finite element method for unfolding large and thick blades of francis turbines
Authors: Zhengkun Feng, Henri Champliaud, Michel Sabourin, Sebastien Morin
Abstract
The metal pressing process is widely used in industries, such as energy, civil, automotive and shipbuilding engineering. For the design of the process, blank design is firstly performed to determine the dimension of the flat blank. Traditionally, the trial and error approach is used. However, this approach wastes much time and raw materials, especially in manufacturing the blades of large Francis turbines. The rapid development of the computing technology makes it possible to get optimum blanks by numerical modeling and simulations. In this paper, the multi-step inverse finite element approach is investigated for the blank design and an elasto-plastic model has been built using the well-known software ANSYS. Unfolding tests with simple geometries have been carried out and the numerical results agree well with the results obtained by analytical analyses. Finally, a large and thick blade of Francis turbines for hydropower plants has been successfully unfolded.
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