URL study guide
https://tue.osiris-student.nl/onderwijscatalogus/extern/cursus?cursuscode=4MM20&collegejaar=2025&taal=enOmschrijving
The mechanical behaviour of materials is strongly influenced by the structure of the material at the microscopic level. For many applications, such as applications where the length scale is relatively small with respect to the size of the microstructure, it is important to understand the role of the microstructure and to couple it to the continuum response of the material. Measurement and modelling of this microstructure and the interactions between the components form an important tool, with the ultimate goal of coupling the developed structure-property relationships to optimize the processing conditions and material properties.In the computational part of the course, an introduction into different aspects of micromechanics is given, followed by various micromechanical approaches and homogenisation techniques for elastic media, often built upon various multi-scale approaches for large deformations and arbitrary material behaviour. Averaging techniques such as the Taylor and Sachs and self-consistent approaches as well as techniques for modelling of microstructures via representative volume elements and unit cell approaches will be treated. Moreover, micromechanical approaches which are based on physical processes in the material will be discussed, starting with the Gurson model and followed by the theory of crystal plasticity and the mechanics of dislocations and their use in crystal plasticity models.
In the experimental part of the course, an overview is given of the measuring techniques that can be used to study the microscopic (topographic, mechanical and/or chemical) properties of materials at a (very) small scale. Various forms of mechanical testing, (optical, electron, and profilometric) microscopy, and digital image correlation are discussed. The underlying physical principles will be addressed concisely, especially of the different microscopy techniques. A number of lab sessions give the opportunity to work with the most-commonly used techniques, including a lab session that combines mechanical testing and in-situ microscopy with digital image correlation and simple numerical simulation. Examples from faculty research and literature will be used to illustrate possibilities and restrictions of these techniques, and how these can be used in combination with the computational techniques.
Doelstellingen
- Becoming familiar with various aspects of micromechanics, modelling of material behaviour at different length scales and the coupling of these length scales.
- Acquiring knowledge, insights and engineering skills of microscopic and mechanical measurement and analysis techniques for the analysis of structure-property relations in materials and microsystems.