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2 Mechanics and Mechanical Engineering

2 2014

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Performance Analysis of Wheel and Rail Contact by Nature of Material Characteristics - a Contact Mechanics Approach

Gandhi V. C. S., Kumaravelan R., Ramesh S., Thanmanaselvi M., Sriram K.

Mechanics and Mechanical Engineering

2014

Vol. 18, nr 1

11--24

The study aims on by contact analysis of a cylindrical wheel and a rail structure of I–section with considering the material properties of an elastic–plastic adhesive frictional contact. Different materials are considered for the analysis based on Young’s modulus and yield strength ratio (E/Y). The contact analysis of this model has been carried out using analysis software ANSYS. The simulation results shows that the maximum stress and strain developed at a point near by the contact edge for lower E/Y value of material and move along the center of a straight line in the contact region between wheel and rail if the E/Y value increases. The results are compared with the basic contact model and shows that good agreement for the nature of material dependence.

Performance Analysis of Motor Cycle Helmet under Static and Dynamic Loading

Gandhi V. C. S., Kumaravelan R., Ramesh S., Venkatesan M., Ponraj M. R.

Mechanics and Mechanical Engineering

2014

Vol. 18, nr 2

85--96

Each year nearly nine hundred persons die in head injuries and over fifty thousand persons are severally injured due to non wearing of helmets . In motor cycle accidents, the human head is exposed to loads exceeding several times the loading capacities of its natural protection. In this work, an attempt has been made for analyzing the helmet with all the standard data. The simulation software ‘ANSYS’ is used to analyze the helmet with different conditions such as bottom fixed-load on top surface, bottom fixed– load on top line, side fixed–load on opposite surface, side fixed–load on opposite line and dynamic analysis. The maximum force of 19.5 kN is applied on the helmet to study the model in static and dynamic conditions. The simulation has been carried out for the static condition for the parameters like total deformation, strain energy, von Mises stress for different cases. The dynamic analysis has been performed for the parameter like total deformation and equivalent elastic strain. The result shows that this values are concentrated in the retention portion of the helmet. These results has been compared with the standard experimental data proposed by the BIS and well within the acceptable limit.