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Title: Plastic flow in metals : I. Thermal coupling behaviour; II. Thin sheet forming
Author: Onate Ibanez de Navarra, E.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1979
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In this thesis the flow formulation is applied to the study of the coupled temperature-flow behaviour of metals and to the analysis of thin sheet metal forming processes. In the first part of the thesis the "flow formulation" is described and different procedures to impose incompressibility are discussed. The behaviour of the nine noded Lagrangian and eight noded serendipity elements using the penalty function approach is studied for a simple plane extrusion problem. A steady state coupled thermal flow numerical solution algorithm is presented. The pressure is eliminated as an explicit variable in the weak (Galerkin) formulation of the problem and the incompressibility constraint is imposed via a penalty function approach. Some examples of plans extrusion and rolling problems coupled with temperature are given. In the second part of the thesis, the general flow formulation is simplified using shell theory to deal with the deformations of thin sheets of metals. Strain hardening and friction effects are taken into account. Axisymetric situations are treated first using linear elements and numerical solutions for some cup forming processes are given. Finally, the general solution is attempted; techniques to improve the performance of Ahmed shell elements are discussed and numerical solutions for the general deformation of circular and square sheets of metal under a rigid hemispherical punch are given.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available