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Simulation and Measurement of Residual Stresses in a Stress Lattice
Linköping University, Department of Management and Engineering. Linköping University, The Institute of Technology.
Department of Mechanical Engineering, Jönköping University, Jönköping, Sweden.
Department of Mechanical Engineering, Jönköping University, Jönköping, Sweden.
2007 (English)In: Proceedings of 2nd International Conference on Simulation and Modelling of Metallurgical Processes in Steelmaking,, 2007Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
2007.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-12738OAI: oai:DiVA.org:liu-12738DiVA: diva2:16947
Available from: 2007-11-07 Created: 2007-11-07
In thesis
1. Optimization of Castings by using Surrogate Models
Open this publication in new window or tab >>Optimization of Castings by using Surrogate Models
2007 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis structural optimization of castings and thermomechanical analysis of castings are studied.

In paper I an optimization algorithm is created by using Matlab. The algorithm is linked to the commercial FE solver Abaqus by using Python script. The optimization algorithm uses the successive response surfaces methodology (SRSM) to create global response surfaces. It is shown that including residual stresses in structural optimization of castings yields an optimal shape that differs significantly from the one obtained when residual stresses are excluded.

In paper II the optimization algorithm is expanded to using neural networks. It is tested on some typical bench mark problems and shows very promising results. Combining paper I and II the response surfaces can be either analytical functions, both linear and non-linear, or neural networks. The optimization is then performed by using sequential linear programming or by using a zero-order method called Complex. This is all gathered in a package called StuG-OPT.

In paper III and IV focus is on the thermomechanical problem when residual stresses are calculated. In paper III a literature review is performed and some numerical simulations are performed to see where numerical simulations can be used in the industry today. In paper IV simulations are compared to real tests. Several stress lattices are casted and the residual stresses are measured. Simulations are performed by using Magmasoft and Abaqus. In Magmasoft a J2-plasticity model is used and in Abaqus two simulations are performed using either J2-plasticity or the ”Cast Iron Plasticity” available in Abaqus that takes into account the different behavior in tension and compression for grey cast iron.

Place, publisher, year, edition, pages
Institutionen för ekonomisk och industriell utveckling, Linköpings universitet, 2007. 23 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1325
Keyword
Response Surface Methodology (RSM), Residual Stresses, Castings
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-10192 (URN)978-91-85831-25-8 (ISBN)
Presentation
2007-10-19, E1405, Hus E, Tekniska Högskolan i Jönköping, Jönköping, 10:00 (English)
Opponent
Supervisors
Note

Report code: LIU-TEK-LIC-2007:34.

Available from: 2007-11-07 Created: 2007-11-07 Last updated: 2012-08-24

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Gustafsson, Erik

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