Understanding the basic principles of welding technology as a prescribed course of action to be followed when making a weld. Introducing students to techniques of material selection, preparation, preheating, methods and control of welding and subsequent thermal treatment. Introducing students to the application of numerical methods in analysis and simulation of welding processes. Understanding and studying the problem of coupled external load of welded structures. The development of independent and practical work using licensed software.

By attending the course the students are mastering the basic knowledge of welding technology. Theoretical considerations and computational examples enable the student to master all the necessary principles of welding technology needed for the manufacture of welded joints. Introducing students to current modern standards and recommendations in this field. By attending this course students will master advanced use of finite element method, especially in the field of welding and welded structures. Theoretical considerations, computational examples and work by using licensed software, enables students to link previously acquired knowledge of mathematics, mechanics, construction and mechanical resistance of materials for application in engineering practice.

Defining the prior specification of welding technology (PSWT). Qualification of welding technology (QWT). Specification of welding technology (SWT).Heat treatment after welding. Welding sequence. Solving nonlinear problems by FEM; types of nonlinearities, review. Introduction to non-linear materials, the basic theory of plasticity. Presenting various criteria of plastic flow of material in the FEM. Connections between strains and stresses in the plastic field - and the flow law in the FEM formulation. Influence of reinforcement material. The influence of material anisotropy. The case of heterogeneous materials - application of welded joints. Problems porous materials. Viscoplasticity. Algorithms solving nonlinear problems; incremental - iterative procedures. Viscoelasticity. Presentation of thermal stress, coupled by FEM analysis. Application of different welding processes. The techniques of introducing residual stress.

Solving exercises in specification of welding technology - examples include various types and thicknesses of the base metal, welding process and position. Solving exercises in qualification of welding technology - examples include various types and thicknesses of the base metal, welding process and position.Constitutive expression of non-linear material behavior. Examples of formulations in the FEM. The formation of the real stress – strain curve. Special cases. Development of FEM models of welded joints and elastic-plastic analysis. Design of a FEM model of the welded joint and the elastic-plastic analysis. The application of different algorithms solving nonlinear problems, convergence and accuracy of the solution. Developments of FEM contact models. Post-processing. Techniques of introducing residual stresses - application on different welding procedures. FEM solutions in assessing fracture integrity of the weld. Numerical simulation of welding processes.

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[1] Written lessons from lectures (handouts) [2] A. Sedmak, Use of the fracture mechanics on the structure integrity assessment, Faculty of Mechanical Engineering, Belgrade, 2003., ISBN 86-7083-473-1 [3] M. Kojic, Computational Prrocedures in Inelastic Analysis of Solids and Structures, Kragujevac, 1997., ISBN 978-3540265078 [4] M. Sekulović, Finite Element Method, Faculty of Civil Engineering, Belgrade, 1988., ISBN 978-99955-81-21-3 [5] S. Sedmak et al., The Challenge od Materials and Weldments, SSIL, Belgrade, 2008., ISBN 978-86-86917-04-1 [6] AWS, Welding handbook, 9th edition, ISBN 978-0-87171-053-6

Total assigned hours: 65

New material: 35
Elaboration and examples (recapitulation): 15

Auditory exercises: 0
Laboratory exercises: 0
Calculation tasks: 0
Seminar paper: 0
Project: 0
Consultations: 0
Discussion/workshop: 0
Research study work: 0

Review and grading of calculation tasks: 0
Review and grading of lab reports: 0
Review and grading of seminar papers: 0
Review and grading of the project: 5
Test: 0
Test: 0
Final exam: 10

Activity during lectures: 10
Test/test: 20
Laboratory practice: 20
Calculation tasks: 0
Seminar paper: 20
Project: 0
Final exam: 30
Requirement for taking the exam (required number of points): 0

Kojic M., Computational Prrocedures in Inelastic Analysis of Solids and Structures, Kragujevac, 1997., ISBN 978-3540265078; R.W.Hertzberg, Deformation and Fracture Mechanics of Engineering Materials, New York, 1996., ISBN-10. 0470527803 ; L. Pook, Metal Fatigue What It Is, Why It Matters, London, Springer, 2007., ISBN: 978-1-4020-5596-6