Research projects

Estimation Method concerning the Material Properties of Textile Composite Layers

Textile composites are fabric reinforced plastics. Such composites can be modelled as orthotropic materials. The linear elastic orthotropic material law in plane stress is determined by four independent material constants (E₁, E₂, , G₁₂). The goal of the research is the construction of a finite element model cell. This model cell can determine these material constants if the properties of the fibre of the matrix and their volume content in the layer are known. The research analyses the textiles produced from flat roving. A roving consists of several thousand micron thin fibres. It compares different textile reinforced composites so that the roving, the layer thickness and the matrix are the same. It determines the material constants of a carbon fabric reinforced polyester resin with tensile and shear tests. The research validates the finite element model cell to the comparison of the measurement-results.

Gergely Bojtár professor’s assistant

Supervisor: Prof. Dr. M. Béla Csizmadia PhD, full professor, Prof. Dr. János Égert CSc. full professor

Mechanical Engineering Doctoral School, Szent István University, Gödöllő

Research topic: Numerical analysis of mechanical and thermodynamic behavior the vehicle components made of rubber

The description of rubber’s mechanical behaviour is a promising research topic, not only for theoretical research but for transport- and vehicle industry and for practical applications too. As described above, according to my research topic I would like to examine the following: the first step is that the physical laws of the theoretical background for such a mechanical and thermodynamic correlations must extend to tire-and in case of rubber-like material’s deformations - it is necessary to consider what kind of material laws can be used to achieve a given accuracy as well -; the second step is the development of numerical solution algorithms and a computer simulation of the thermo-attached task; and the last is the checking of the theoretical model and computer simulations with specific measurements and prove the authenticity of calculations.

Veronika Etelka Szüle professor’s assistant

Supervisor: Dr. Balázs Pere PhD, associate professor

Interdisciplinary Doctoral School of Engineering, Széchenyi István University, Győr