Ali Abdul-Aziz | Kent State University (original) (raw)
Papers by Ali Abdul-Aziz
Nondestructive Evaluation of Aging Materials and Composites IV, 2000
Ceramic Engineering and Science Proceedings, 2000
ABSTRACT Steady state thermal analysis with coupled stress analyses were conducted to study the e... more ABSTRACT Steady state thermal analysis with coupled stress analyses were conducted to study the effect of cooling hole geometries on a silicon nitride (Si3N4) cooling plate. The plate was subjected to a simulated burner rig thermal boundary conditions. The application of a thermal barrier coating (TBC) to the side that is exposed to the hot gases are also included. The presence of the TBC was able to reduce the temperature in the substrate by at least 7% resulting in a decrease in the maximum principal stress by 33%. The larger the cooling holes and the smaller spacing in between further reduced the temperature and consequently the stresses.
Ceramic Engineering and Science Proceedings, 2000
To complement the effectiveness of ceramic materials and their applicability to turbine engine ap... more To complement the effectiveness of ceramic materials and their applicability to turbine engine applications, a parametric study using the finite element method was carried out. This study conducted thorough analyses of a thermal-barrier-coated silicon nitride (Si 3 N 4 ) plate specimen with cooling channels, where its thermal conductivity was varied in an attempt to minimize the thermal stresses and reach an optimal state of stress. The thermal stress profile was generated for specimens with circular and square cooling channels. Lower stresses were reported for a higher magnitude of thermal conductivity and in particular for the circular cooling channel arrangement. Contour plots for the stresses and the temperature are presented and results obtained are discussed.
Materials Evaluation
NASA contractor report. NASA CR. United States. National Aeronautics and Space Administration
NASA contractor report. NASA CR. United States. National Aeronautics and Space Administration
Nondestructive Evaluation of Aging Materials and Composites IV, 2000
Ceramic Engineering and Science Proceedings, 2000
ABSTRACT Steady state thermal analysis with coupled stress analyses were conducted to study the e... more ABSTRACT Steady state thermal analysis with coupled stress analyses were conducted to study the effect of cooling hole geometries on a silicon nitride (Si3N4) cooling plate. The plate was subjected to a simulated burner rig thermal boundary conditions. The application of a thermal barrier coating (TBC) to the side that is exposed to the hot gases are also included. The presence of the TBC was able to reduce the temperature in the substrate by at least 7% resulting in a decrease in the maximum principal stress by 33%. The larger the cooling holes and the smaller spacing in between further reduced the temperature and consequently the stresses.
Ceramic Engineering and Science Proceedings, 2000
To complement the effectiveness of ceramic materials and their applicability to turbine engine ap... more To complement the effectiveness of ceramic materials and their applicability to turbine engine applications, a parametric study using the finite element method was carried out. This study conducted thorough analyses of a thermal-barrier-coated silicon nitride (Si 3 N 4 ) plate specimen with cooling channels, where its thermal conductivity was varied in an attempt to minimize the thermal stresses and reach an optimal state of stress. The thermal stress profile was generated for specimens with circular and square cooling channels. Lower stresses were reported for a higher magnitude of thermal conductivity and in particular for the circular cooling channel arrangement. Contour plots for the stresses and the temperature are presented and results obtained are discussed.
Materials Evaluation
NASA contractor report. NASA CR. United States. National Aeronautics and Space Administration
NASA contractor report. NASA CR. United States. National Aeronautics and Space Administration