A finite element method for three-dimensional analysis of metal forming

<p>"The importance of metal forming by extrusion was reviewed. A Finite Element Approach was developed to analyze extrusion processes. A brick type linear element and the Upper Bound theorem were used to analyze the extrusion of a cylindrical billet into a square cross-section prism. A minimization technique for a non-linear functional with linear constraints was developed. Different types of boundary conditions were also formulated. A frictionless extrusion was simulated using the computer program developed. Velocity profiles at different sections of the deforming solid were obtained and an average extrusion pressure was predicted for a given area reduction ratio.</p> <p>Extrusions from a cylindrical billet into a square cross-section prism were performed for four different area reduction ratios: 1:2.26, 1:2.55, 1:2.97 and 1:3.34. A Beta Press manufactured by Pressure Technology Corporation of America was used. Billets were made from 6061 T 651 Aluminium.</p> <p>The effect of friction was investigated analytically. Also a brick type quadratic element (20 nodes) was tested successfully using the compression of a short cylinder as an example"--Abstract, page iii.</p>

Name thesis:degree_name

Ph. D. in Mechanical Engineering

Grantor

University of Missouri--Rolla

Year dc:date.available

2016

Author dc:creator

• Phu, Nguyen Don

• Mechanical Engineering

Repository record dc:identifier

https://scholarsmine.mst.edu/doctoral_dissertations/287

OAI identifier oai:identifier

oai:scholarsmine.mst.edu:doctoral_dissertations-1289