Application of Inverse Finite Element in Tube Hydroforming

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Einolghozati, Mona | 2010

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 41098 (08)
University: Sharif University of Technology
Department: Mechanical Engineering
Advisor(s): Assempour, Ahmad
Abstract:
The inverse Finite Element method (IFEM) has been used for estimation of the initial length of tube, axial feeding and fluid pressure in tube hydroforming. The already developed IFEM algorithm, which has been used in this work, is based on the total deformation theory of plasticity. Although the nature of tube hydroforming is three-dimensional deformation, a technique has been used to perform the computations in two-dimensional space. Therefore, compared with conventional forward finite element methods, the present computations are quite fast with no try and error process. The solution provides all the components of strain. Using the forming limit diagram (FLD), the components of strain can lead us to measure the potentials for failures or wrinkles during the deformation. The results of the analysis for free bulging and square bulge have been compared with some published experimental data and the results obtained by other conventional commercial software. In this study, material behavior in unfolding method has been improved by using Tangent- modulus method so numbers of stages to converge the results have been reduced and the results are closer to the experimental data
Keywords:
Forming Limit Diagram (FLD) ; Tube Hydroforming ; initial Length ; Fluid Pressure