Search for dissertations about: "material modelling"

Showing result 1 - 5 of 674 swedish dissertations containing the words material modelling.

2. 1. Study of precipitation in martensitic Fe-C-Cr alloys during tempering Experiments and modelling

   University dissertation from Stockholm : KTH Royal Institute of Technology

   Author : Ziyong Hou; KTH.; [2015]
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fe-C-Cr alloy; Microstructure; Precipitates; Tempering of martensite; Electron microscopy; Modelling.; Materials Science and Engineering; Teknisk materialvetenskap;

   Abstract : Understanding the precipitation reaction is very important since precipitation hardening is one of the most effective strengthening mechanisms in metallic alloys. In martensitic steels, a tempering heat treatment is often performed. READ MORE

4. 2. Non-overlapping Germ-grain Models: Characteristics and Material Modelling

   University dissertation from Göteborg : Chalmers University of Technology

   Author : Jenny Andersson; Göteborgs universitet.; Gothenburg University.; [2005]
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Poisson process; Convex sets; Material fatigue; Voronoi tessellation; Germ-grain process; Pair-correlation function; Mark-correlation function; Short cracks; Volume fraction;

   Abstract : We consider three different non--overlapping germ--grain models, two of which are constructed in a similar fashion. These two models are generalisations of Mat\'ern's hard--core models. In both cases we start with a homogeneous Poisson process and use the points as centres of convex sets, grains, of the same shape. READ MORE

5. 3. Determination of Material Properties for Fire Modelling

   University dissertation from Avdelningen för Brandteknik, Lunds Tekniska Högskola

   Author : Ulf Göransson; Lund University.; Lunds universitet.; [2005]
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Material properties; Material degradation; Measurements; Fire test data; Byggnadsteknik; Building construction; Teknik; Technological sciences; Fire; Surface temperature; Mathematical modelling;

   Abstract : Fire and flame spread are very complex phenomenon to study. Several aspects need to be considered and treated. In order to be able to do a correct analysis of the flame spread phenomenon, which is necessary to be able to predict flame spread, knowledge of material properties are needed. Material properties can be obtained in different ways. READ MORE

6. 4. Modelling of Granular Materials

   University dissertation from Avdelningen för Brandteknik, Lunds Tekniska Högskola

   Author : Aylin Ahadi; Lund University.; Lunds universitet.; [2004]
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; hydraulic engineering; Civil engineering; materialteknik; Materiallära; Material technology; binary mixture model; simulations; material modelling; finite element; granular materials; offshore technology; soil mechanics; Väg- och vattenbyggnadsteknik;

   Abstract : The aim of this doctoral study is to develop and implement a material model for granular materials. The course of this work was concentrated upon a non-associated plasticity model with yield surface and the flow potential expressed in terms of the mean stress p and the third stress invariants I3. READ MORE

7. 5. On failure modelling in finite element analysis material imperfections and element erosion

   University dissertation from Institutionen för konstruktions- och produktionsteknik

   Author : Mattias Unosson; Linköpings universitet.; Linköpings universitet.; [2005]
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; finite element method; element erosion; material failure; material imperfections; crack-tip; TECHNOLOGY Engineering mechanics Solid mechanics; TEKNIKVETENSKAP Teknisk mekanik Fastkroppsmekanik;

   Abstract : This dissertation concerns failure modelling with material imperfections and element erosion in finite element analyses. The aim has been to improve the element erosion technique, which is simple to use and implement and also computationally inexpensive. READ MORE