The research aimed to study parameters affecting the stress intensity and stress distribution as well as the deformation of run-flat tires for passenger cars using the Finite element method. Both experimental methods and finite element methodologies were employed in the research process. The results were obtained by comparing the strain values from the two methods to demonstrate the consistency of both methods. The differences in their strain values were shown in the range of 10-16% confirming the analyzing capability in this problem through the Finite element method. At the pre-processing step both procedures and methods were proven with SolidWorks simulation program together with experimentation. These consequences were incorporated to assist the design of run-flat tires. Parameters affecting the stress intensity and stress distribution were evaluated to understand the effects on deformation of the new designed run-flat tires. The reverse engineering process was thus applied in the research process by scanning with FARO P06-05 and creating solid modeling 3D models with Geomagic program for SolidWorks. These could assist in designing the reverse- engineered tire pan. Three components were additionally designed to support the ease in assembling or removing run flat tires from the pan. Run flat tires were finally designed for passenger cars typically the most common small cars. The weight of this car was limited at not more than 1800 kg and the thickness of the wheel pan was 17 inches. The analysis information assumed that the vehicles weight was distributed equally throughout all 4 wheels. The material used to make the run flat tires was a composite tire type that could withstand the pressure occurring from the weight of a passenger car. The results of the analysis demonstrated that the maximum stress on the run flat especially at the position where the run flat surface was in contact with the road was 30-45 MPa which depends on the location of contact with the road. Thus it affected the stress distribution on the wheel pan. The parameters obtained from the study affecting the stress distribution and deformation were accounted to be such types of materials made for run flat tires cross-sectional area and width of run flat tires.

The objectives of this research were to study the stress intensity in run-flat metal wheels and to design a new type of run-flat wheels that can be used in a small armored regular truck. Experimental methods and finite element methodologies were applied in the research process. The results obtained by comparing the strain values from the two methods demonstrated the consistency of both methods. The differences in stress values were in 10 -16 percentages which could confirm the capability to analyze the stress distribution and deformation of run-flat by a finite element method. Proven processes and procedures in Pre-processing with SolidWorks Simulation were utilized to design run-flat wheels and a reverse engineering process was next used to create wheel rims and design the cross-sectional shape of new run-flat wheels made of composite materials which have an important reactant; a polymer group and aluminum oxide powder added to enhance the strength. The designed parameters consisted of 1) the width of the run-flat wheels 2) the internal and external radius in which the internal radius depending on the size of the wheel rim and the outer radius which is a variable that determines the height of the run-flat wheels 3) the design of a lockset for tightening the run flat wheels to the wheel rims 4) materials used in the structure of the run-flat wheels and 5) tire pressure. The run-flat wheels designed and built into three-piece parts were designed for ease of wheel assembly or disassembly out of the wheel rims. By analyzing the intensity of stress accumulated in a conventional run-flat wheel (run-flat metal wheel) the stress generated in a run-flat wheel did not exceed the limit of the Yield stress and had a safety value between 3-5 times for new run flat wheels with a maximum stress of 26 MPa. Sizing and cross-sectional dimensions of run flat wheels thus resulted in stress which was in the range that could be withstood and acceptably employed. It was also possible to reduce the height of the flat wheels to make the rear flats lower and increase the width of the run flat wheels which would help distribute more weight to the wheel rims.