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This master’s thesis describes methods of calculating deformations of large astronomical telescope mirrors caused by the mirror support system. In the first part of the report these calculation methods are derived, along with methods of optimizing a support system pattern. Both analytical and numerical methods are described in the case of deformation analysis, and methods based on probabilistic me
The purpose of this Master’s thesis has been to establish a method with which the stochastic field for the hydraulic conductivity within an aquifer can be determined. The stochastic field is characterised by the mean value and the standard deviation of the hydraulic conductivity together with a selected statistical distribution and the correlation between different points within the aquifer. The a
The modelling of rubber materials in industrial applications is often carried out by experimental analysis. The company Saab Automobile AB in Trollhättan has assigned the task of simulating the transportation of vibration and noise from the engine of a car to the surrounding structures. The vibration and noise is reduced by the use of vibration dampers made of rubber. The damper is designed as two
This master thesis describes nonlinear nite element analysis and ex- perimental verication tests of a corrugated board panel when loaded in-plane. Detailed modelling of a panel, where both the liner and fluting is represented in detail, is compared to simplied shell modelling with a solid core and to experimental tests. In the experimental tests, Stereo- scopic Digital Speckle Photography is used t
A low creep rate and a long lifetime are important mechanical properties for corrugated board and its constituent’s linerboard and fluting. These properties ensure that the package protects the goods during the entire duration of transport and storage. This study involves several creep and tensile tests of linerboard in the machine direction (MD). The objective is to investigate how free or rest
This master dissertation describes the process of implementing a coupling between the boundary element method (BEM) and the finite element method (FEM) for three dimensional time harmonic structure-acoustic models in CALFEM, which is a finite element toolbox to MATLAB. Since no boundary elements earlier have been represented in CALFEM the development and implementation of constant and linear boundar
This master’s thesis relates to the design of prefabricated balconies. Such balconies are often designed in different ways. A separate investigation of what is technically possible regarding, among other things, supports and balcony sizes must often be performed in every project involving balconies. Three kinds of solutions are presented. These are tie rod, cantilever and column supported balconie
Within the automotive industry today, companies save significant amounts of money through computer simulations. Mathematics through numerical methods becomes important when as in this case the investigation is done with the Finite Element Method (FEM). A self-pierced rivet (SPR) joint specimen in a T-peel case is studied. The specimen consists of 1.15 mm thick steel sheets with a rivet of 5 mm in
A geometry model for three dimensional fibre networks is proposed. The geometry model is intended to be a part of a system, where data from a computer tomography of a fibre material can be fitted to the geometry model and from there, be evaluated according to key parameters such as fibre length, fibre orientation angles and radii of curvature. The model is also intended to give the geometry foundation
