¨ Braunschweig Technische Universitat Institut fur ¨ Angewandte Mechanik Campus Nord ¨ Bienroder Weg 87, Gebaude 1411 38106 Braunschweig Bachelor-/Studien-/Masterarbeit Prof. Dr.-Ing. Laura De Lorenzis Concrete Structure Generation from www.tu-braunschweig.de/iam Computed Tomography (CT) Concrete is a widely used and economically important building material. To understand its behavior, numerical simulations, e.g., with finite elements, may be used. These models need information on the constituents’ mechanical behavior (constitutive models) and on the geometry of the problem. Computed tomography (CT) is a method for obtaining volumetric images of material samples. To use them in a finite element simulation, the different phases need to be separated (segmentation) and meshes must be generated. Geometric Structure of Concrete from Computed Tomography The aim of this work is to evaluate image processing strategies for segmentation of CT images of concrete, to assess mesh and/or geometry generation techniques and to investigate the impact of different processing strategies on the predicted mechanical behavior. Prerequisites: Very good Matlab skills. Very good knowledge of the finite element method and at least one common FE software package. Experience in image processing preferred. Contact Dr. Roland Kruse +49 (0) 531 391 94359 [email protected] ¨ Braunschweig Technische Universitat Institut fur ¨ Angewandte Mechanik Campus Nord ¨ Bienroder Weg 87, Gebaude 1411 38106 Braunschweig Scope of work The assignment includes the following topics: Prof. Dr.-Ing. Laura De Lorenzis www.tu-braunschweig.de/iam • Use of commercial CT image processing software (Avizo) to evaluate preprocessing and image segmentation strategies, on different types of concrete. • Mesh and/or geometry generation from segmented images. • Implementation of these processes in Matlab. • Finite element simulations to estimate the effect of image processing on predicted mechanical behavior. • Report. This work may be split into several parts (e.g. segmentation, geometry reconstruction), esp. in case of a Bachelor’s thesis or specialization project (each 3 months). Literature • Dai, Q.: Two- and three-dimensional micromechanical viscoelastic finite element modeling of stone-based materials with X-ray computed tomography images, Construction and Building Materials 25, 2011 ¨ ¨ • Hafner, S., Eckardt, S., Luther, T., Konke, C.: Mesoscale modeling of concrete: Geometry and numerics, Computers and Structures 84, 2006 • Onifade, I.: Internal Structure Characterization of Asphalt Concrete using XRay Tomography, Master of Science Thesis, Royal Institute of Technology (KTH), 2013 • Razmjoo, A., Poursaee, A.: Finite Element Modeling of Concrete Based on Quantitative Computed Tomography (QCT), 1st Annual Graduate Research and Discovery Symposium, Clemson University, 2013 Contact Dr. Roland Kruse +49 (0) 531 391 94359 [email protected]
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