Plenary and Semi-Plenary Lectures
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| Title: |
| Computational Welding Mechanics – a challenge |
| Lecturer: |
| Lars-Erik Lindgren |
| Abstract: |
The overall aim of Computational Welding Mechanics (CWM) is to establish methods and models for control and design of welding processes. The research in this field is concerned with subjects ranging from modelling of heat generation, weld pool phenomena to thermal stresses and deformations of welded structures or components. The actual physics of the weld pool is approximated by heat input models in CWM whereas detailed models of this region belong to the field of Weld Process Modelling. The use of a heat input model makes it possible to describe the process as a coupled thermo-mechanical problem or sometimes denoted a coupled thermo-metallurgical-mechanical (TMM) problem. The latter notation emphasises the microstructure evolution that takes place during welding and affects the constitutive model.
The evolution of CWM from its start around 1970 to presently is outlined in the talk. The well known researchers Hibbitt and Marcal made some initial contributions to CWM and probably the experience they obtained was a good foundation for their future work as mastering CWM is a challenge in many respects.
Details of modelling issues that are specific to CWM are described and a methodology for simulations with calibration and validation steps. Constitutive modelling of various levels of sophistication are discussed and the current state of the art together with industrial applications are given. |
 Prof Lars-Erik Lindgren is professor in Mechanics of Materials at Luleå University of Technology (Ltu), Sweden. His special interests are material modelling and simulations of manufacturing processes. He obtained his PhD degree in Solid Mechanics at Ltu 1985. His thesis work focussed on welding simulations. He has continued to work in this area since then and extended it to other manufacturing processes like heat treatment, different sheet metal forming processes, extrusion, rolling, and machining. He has supervised eight students to a PhD-degree and is currently supervising seven PhD-students. Most projects are in co-operation with companies like Volvo Aero, Sandvik AB and Swedish Steel but also with SMEs. He has been teaching courses in subjects ranging from mathematics, mechanics, and computational mechanics to constitutive modelling. Furthermore, he has been administrating undergraduate programmes at Ltu.
He has been lecturing about Computational Welding Mechanics world wide in short courses, seminars and keynote presentations at conferences and is pleased to have the opportunity to share his experience in this field in his semi-plenary talk at WCCM-VII. |
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