|Name||Dr. Falk Wittel|
|Name variants||Falk K. Wittel|
Institut für Baustoffe (IfB)
ETH Zürich, HIF E 27
|Telephone||+41 44 633 28 71|
|Department||Civil, Environmental and Geomatic Engineering|
|101-0615-01L||Materials Lab Exercises||4 credits||4P||R. J. Flatt, U. Angst, I. Burgert, D. Kammer, H. Richner, F. Wittel|
|Abstract||Introduction into the basic and practical knowledge of important building materials and testing methods.|
|Objective||Introduction into the basic and practical knowledge of important building materials and testing methods.|
|Content||o Introduction of material testing equipment, with various examples of experiments on metals (tensile behaviour, hardness, bending and impact loading).|
o Theoretical background and practical aspects of concrete technology: mixture design, casting and setting; determination of mechanical properties.
o Properties of bricks and mortar: individual materials and the composite brickwork. Parameters like strength, Young’s modulus, water absorption and thermal conductivity are determined.
o Understanding the characteristic properties of wood: anisotropy, hygroscopic behaviour, shrinkage and swelling, and effect of size on strength. Introduction to test-methods for wood and wood-products.
o Introduction into the basics of scanning electron microscopy: practical exercises with the Environmental Scanning Electron Microscope (ESEM).
o Introduction to fundamentals of Finite Element Methods and their application in examples.
o Introduction to durability of building materials and building structures: assessment of potentials for detecting and locating corrosion of steel reinforcement in concrete.
|Lecture notes||For each topic a script will be provided, that can be downloaded under www.ifb.ethz.ch/education|
|101-0617-02L||Computational Science Investigation for Material Mechanics||4 credits||2S||D. Kammer, F. Wittel|
|Abstract||Introduction to computational sciences with focus on numerical modeling of the mechanics of materials. Simulation of material damage and failure with advanced finite element methods.|
|Objective||Learning from mistakes and failures is as old as the engineering discipline. Understanding why things went wrong is essential for improvement, but often impossible without the help of numerical modelling. Real world problems are often highly nonlinear, dependent on multiple physical fields, involve fundamental material behavior far from equilibrium and reversibility, and can often only be understood by addressing different relevant scales.|
In this course, we will use real-life cases to learn how to deal with such problems. Starting from the problem description with governing equations, you will learn how to tackle non-linear and multi-field problems using numerical simulations. A particular focus will be on fracture. Starting from the failed state, we will investigate potential causes and find the conditions that resulted in failure. For doing so, you will learn how to predict it with the Finite Element Method (FEM). To correctly assess failure, plastic behavior and size effects, originating from the underlying material microstructure, need to be considered. You will learn how to deal with plasticity in FEM and how you can get information from the heterogeneous material scale into your FEM framework.
|Content||1 Introduction to (numeric) forensic engineering|
2 The nature of engineering problems (governing equations)
3 Numerical recipes for dealing with non-linear problems
4 Multi-field problems (HTM; Comsol)
5 On the nature of failure - Physics of damage and fracture
6 Cracks and growth in structures (LEFM and beyond)
7 A practical approach to LEFM with FEM (Abaqus)
8 Introduction to metal plasticity
9 Damage and fracture in heterogeneous materials
10 Mechanics of fatigue
11 Visco-elastic failure
12 Student μ-Project presentation
|Lecture notes||Will be provided during the lecture via moodle.|
|Literature||Will be provided during the lecture.|
|101-0639-01L||Science and Engineering of Glass and Natural Stone in Construction||3 credits||2G||F. Wittel, T. Wangler|
|Abstract||The course offers an overview of relevant practical issues and present technological challenges for glass and natural stones in constructions. Students gain a good knowledge of the basics of glasses and natural stones, their potential as engineering materials and learn to apply them in the design of civil engineering constructions and to evaluate concepts.|
|Objective||Glass is increasingly used in constructions to ease the construction process, as functional insulation barrier, even for structural applications of impressive size. While everyone has experienced the innovation potential of glass in the last decade, products from natural stone suffer from an unjustified traditional image that often originates from a lack of understanding of the material and its combination with other materials. Culturally important structures often are made from natural stone and their conservation demands an understanding of their deterioration mechanisms, the concepts of which can be applied to other civil engineering materials. Designers and engineers need the knowledge to reconcile materials and system behavior with the entire processing, handling, integration and life time in mind.|
In this module students are provided with a broad fundamental as well as practice-oriented education on glass and natural stone in civil engineering applications. Present and future construction and building concepts demand for such materials with optimized properties. Based on the fundamentals from the Bachelor course in materials by the end of this module, you should be able to:
-recognize and choose specific applications from the broad overview you were provided with,
-relate processing technologies to typical products and building applications and recognize (and explain typical damage related to wrong material choice or application,
-explain the nature of glassy and crystalline materials and interpret their physical behavior against this background,
-explain the major deterioration mechanisms in natural stone and how this relates to durability,
-analyze material combinations and appraise their application in future products as well as integration in existing constructions,
-summarize with appropriate guidance publications on a related topic in an oral presentation and short report.
|Content||Lecture 1: An introduction to science and engineering of glass and natural stone in construction (FW/TW)|
Lecture 2: Glass chemistry including historical development of glass composition, use of raw materials, melts, chemical stability and corrosion. (FW)
Lecture 3: Geology and mineralogy of stones used in construction. Formation processes, chemistry, crystal structure. (TW)
Lecture 4: Microscopic models for glassy materials. Physics of vitrification. From microscopic physical models to thermodynamics, rheology and mechanics of glassy materials. (FW)
Lecture 5: Stone properties and behavior: microstructure, density, porosity, mechanical properties (TW)
Lecture 6: Glass physics: Optical properties (transmission, reflection, emission, refraction, polarization and birefringence, testing methods); Mechanical properties (density, thermal, mechanical, electric properties, glass testing) (FW)
Lecture 7: Stone properties and durability: transport, moisture and thermal cycling (TW)
Lecture 8: Forming and processing of glass: (plate and molded glass, drawing, slumping, profiling etc.; Processing: Cutting, mechanical processing, tempering, gluing, bending, laminating of glass Surface treatments: coating, sputtering, enameling, printing, etching, chemical pre-stressing.) (FW)
Lecture 9: Durability: Salt crystallization, freezing, biodeterioration (TW)
Lecture 10: Glass products for civil engineering applications: (Molded glasses, fiber glass, foam glass, plate glass); construction glass (insulation glass, structural glass, protective glass, intelligent glass, codes); (FW)
Lecture 11: Conservation: Consolidation, cleaning, and other treatments (TW).
Lecture 12: Glass in constructions. (modelling, application and regulation, typical damage in glass) (FW)
Lecture 13: Student presentations; exam questions (FW/TW)
Lab1: Durability of natural stone (FW/TW)
Lab2: Fracture of glass (FW/TW)
|Lecture notes||Will be handed out in the lectures|
|Literature||Werkstoffe II script (download via the IFB homepage). Rest will be handed out in the lectures|
|Prerequisites / Notice||Werkstoffe I/II of the bachelor studies or equivalent introductory materials lecture.|