Andreas Taras: Catalogue data in Autumn Semester 2019

Name Prof. Dr. Andreas Taras
FieldSteel and Composite Structures
Address
Professur Stahl- und Verbundbau
ETH Zürich, HIL D 36.1
Stefano-Franscini-Platz 5
8093 Zürich
SWITZERLAND
Telephone+41 44 633 45 52
E-mailtaras@ibk.baug.ethz.ch
DepartmentCivil, Environmental and Geomatic Engineering
RelationshipFull Professor

NumberTitleECTSHoursLecturers
101-0121-00LFatigue and Fracture in Materials and Structures4 credits3GE. Ghafoori, A. Taras
AbstractIn this course, the students will learn:
• Mechanisms of fatigue crack initiations in materials.
• Linear elastic and elastic-plastic fracture mechanics.
• Modern computer-based techniques to deal with cracks.
• Laboratory fatigue tests on metallic details with cracks.
ObjectiveThe course will provide a basic knowledge on fatigue and fracture mechanics that are useful in different engineering disciplines such as mechanical, aerospace and civil engineering domains.
ContentThe course covers the basics in fatigue and fracture of materials and structures. It starts with an introduction and then explains the learning goals and the importance of fatigue and fracture in different engineering areas such as mechanical, civil and aerospace engineering domains. The course includes different main topics summarized below:

I) Damages mechanisms and crack initiation in materials under cyclic loadings:
• Mechanisms of fatigue crack initiation in (ductile and brittle) metals.
• Crack initiation under uni-axial fatigue loadings: critical plane approach (critical distance theory), equivalent stress approach, constant life diagram approach, rainflow analysis and Miner's damage rule.
• Crack initiation under multi-axial fatigue loadings: proportional and non-proportional loading.

II) Fracture mechanics:
• Energy analysis, energy release rate and limits of linear elastic fracture mechanics (LEFM).
• Weight function approach: stress intensity factors, crack opening displacement, etc.
• Elastic-plastic fracture mechanics: Irwin and Dugdale models, plastic zone shapes, crack-tip opening displacement and J-integral.
• Fatigue crack growth: crack growth models, Paris' law, crack closure effects, crack growth under mixed-mode.

III) Modern computer lab to simulate fatigue cracks:
• Finite Element Method (FE) and eXtended FEM (XFEM) in complex details.
• XFEM laboratory: training and exercises.

IV) Fatigue and fracture in civil engineering structures:
• An overview of the state-of-the-art (advanced) fatigue design and assessment methods as prevalent in (Central) Europe.
• Haibach, Sonsino, Radaj, FKM-Richtlinie and all the pertaining nominal to local approaches in fatigue assessment of civil structures (e.g., bridges) will be covered in this part.
• Overview of the Swiss and European fatigue design and verification standards of steel structures; for example, Swiss SIA 263 and 269 and Eurocode 3 (EN 1993-1-9) documents.

V) Fatigue and fracture in aerospace structures:
• Design philosophy based on damage tolerance approach.
• Fatigue of mechanically fastened joints and built-up structures (aircraft wing boxes).
• Crack repair techniques.

VI) A visit to the Swiss Federal Laboratories for Materials Science and Technology (Empa) in Dübendorf. The students will:
• Visit different small-scale and large-scale fatigue testing equipments.
• Get to know different ongoing fatigue- and fracture-related projects.
• Witness and help to conduct a fatigue test on a steel plate with a pre-crack.
• Compare the experimental crack-growth behavior (from the lab tests) with their own calculations (from the fracture theories).
Lecture notesLectures are based on the lecture slides and handouts and will be updated throughout the course.
Literature1. Schijve J. “Fatigue of Structures and Materials”, 2008: New York: Springer.
2. Anderson T.L. “Fracture Mechanics - Fundamentals and Applications”, 3rd Edition, Taylor & Francis Group, LLC. 2005.
3. Budynas R.G., Nisbett J.K. “Shigley's Mechanical Engineering Design”, 2008, New York: McGraw-Hill.
Prerequisites / NoticeLaboratory demonstrations and tests at the Structural Engineering Research Laboratory of Empa in Dübendorf, including laboratory tour and showcasing the Empa large-scale 7-MN fatigue testing machine for bridge cables, different fatigue and fracture testing equipment for structural components, etc.
101-0137-00LSteel Structures III3 credits2GA. Taras, R. Bärtschi
AbstractEnhance theoretical considerations and detailing of structural steel design including aspects of economy and erection. E.g. Cranes, composite construction (compression and bending, continuous girders, partial connection, serviceability), fire design, stability of frames and buckling of plates with stiffeners, cold rolled sections, corrosion protection, price calculation and quality control
ObjectiveEnhance theoretical considerations und detailing of structural steel design including aspects of economy and erection.
ContentConstructive design of cranes, composite construction (compression and bending, continuous girders, partial connection, serviceability), fire design, stability of frames and buckling of plates with stiffeners, cold rolled sections, corrosion protection, price calculation and quality control
Lecture notesAutography
Copies of presentations
Literature- Stahlbauhandbuch 1 und 2, Stahlbau-Verlags-GmbH, Köln
- Stahlbaukalender 2000, Ernst + Sohn, Berlin, 1999
Prerequisites / NoticePrerequisites: Steel Structures I and II
101-1187-00LColloquium in Structural Engineering0 credits2KB. Stojadinovic, E. Chatzi, A. Frangi, W. Kaufmann, B. Sudret, A. Taras, T. Vogel
AbstractProfessors from national and international universities, technical experts from the industry as well as research associates of the institute of structural engineering (IBK) are invited to present recent research results and specific projects from the practice. This colloquium is adressed to members of universities, practicing engineers and interested persons in general.
ObjectiveLearn about recent research results in structural engineering.