Commas E2-07 Behavior and modeling of engineering materials - Concrete



Prof. Dr.-Ing. habil. Joško Ožbolt

( (IWB)
Class times 2016:
Thursdays at 14:00 - 15:30
IWB Classroom, Pfaffenwaldring 4
Course Description:
The development of computational material models for detailed 3-dimensional analysis of quasi-brittle materials is treated in this course. After beginning with a general introduction to linear and nonlinear fracture mechanics, material models such as damage, plasticity, smeared and discrete crack and microplane will be discussed. Strong emphasis is placed on the application of these models to concrete. The topics of regularization techniques and adaptive remeshing are also discussed.
The continuation of the Metals and Soils portions of the COMMAS C7 course are offered as independent courses under the titles of :
COMMAS E2-06: Behavior and modeling of engineering materials - Metals
COMMAS E2-08: Behavior and modeling of engineering materials - Soils
Please contact Professor Schmauder ( (Metals) or Professor Vermeer ( (Soils) for more information about these courses.
Course Outline:
• Introduction and course organization
     Course organization
     Quasibrittle materials & motivation for nonlinear analysis
• Concrete material properties
     Review of concrete behavior in tension and compression
     Extension to 3D
• Modeling of concrete
     Basic frameworks for modeling of quasibrittle materials
        Continuum / Combination continuum-discontinuum / Discrete
• Fracture mechanics
     Linear Elastic Fracture Mechanics (LEFM)
        Griffith & Irwin
     Nonlinear Fracture Mechanics (NLFM)
        Discrete crack concept / Smeared crack concept
     Size effect
• Plasticity models for concrete
     Associated and non-associated flow
     Failure surfaces for quasi-brittle materials
• Damage mechanics
     Simple isotropic damage
     Mazar's damage model for concrete
     Other damage models
• "The Smeared Crack Models"
     Fixed / Multi-direction fixed / Rotating
     Stress locking
• Microplane theory
     Concept and fundamental equations
     Relaxation of kinematic constraint / Anisotropy / Model validation
• Objectivity modeling (regularization) and new developments
     Crack band and higher order methods
     Adaptive meshing / Embedded discontinuity elements / X-FEM (Partition of Unity)
Required Texts:
No texts are required. A list of suggested reading (Literature) is provided and some of the readings will be made available in electronic form (PDF).
Assignments may be assigned during the course. No grades will be given for the assignments, however, you are expected to complete the work, which will be corrected and returned to you.
There will be a written final examination at the end of the course.
The course grade will be determined as follows: Final Examination 100%.
Lectures / Reading / Assignments (go to International Degree courses / Commas)
Pfaffenwaldring 4
Rm. 0.5
Office Hours:
There are no scheduled office hours for the course, however, you are encouraged to meet with Prof. Ožbolt or the teaching assistant whenever you have questions regarding the course or assignments.