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An experimental study of mechanical properties of vehicular tire rubbers

Reaz Ahmed S., Deb Nath S. K.

International Journal of Applied Mechanics and Engineering

2011

Vol. 16, no 1

243-255

The paper describes an experimental investigation of the mechanical properties of vehicular-tire rubbers. The original truck-tire as well as retreaded-tire rubbers is considered in the present investigation. In order to compare the results of the tire rubbers, the corresponding properties of commercially available natural rubber are investigated. In the present study, most of the useful mechanical properties, especially required for analyzing the stress problems related to vehicular-tires, are determined experimentally, and the results are discussed for comparison with the corresponding properties of natural rubber and also with the standard properties of elastomer available in the literature. Finally, an example of the effect of material properties on the deformation of a tire-tread section is demonstrated.

Numerical investigation of bond-line stresses of tire tread section

Deb Nath S. K., Salam Akanda M. A., Reaz Ahmed S., Wahhaj Uddin M.

International Journal of Applied Mechanics and Engineering

2008

Vol. 13, no 1

43-61

A numerical investigation of stresses at the bond-line region (tread-casing interface) of retreated tire-tread sections has been presented. More specifically, considering the tire-tread section as a mixed-boundary value plane strain problem of elasticity, the distribution of different stress components are obtained taking special care of the associated boundary conditions. In order to obtain the present numerical solution, displacement potential formulation has been used in conjunction with the finite difference method of solution. In an attempt to simulate the service loading on the tread-section, the frictional no-slip condition of the contact boundary is used together with the uniform contact pressure from the road surface. Several tread aspect ratios are considered to investigate the influences of different geometrical parameters on the state of stresses along the influences of retreated tire sections. The results of the investigation are claimed to be highly accurate, and reliable, and thus, are expected to be used directly for actual design purposes.

Displacement potential solution of short stiffened flat composite bars under axial loading

Deb Nath S. K., Reaz Ahmed S., Afsar A. M.

International Journal of Applied Mechanics and Engineering

2006

Vol. 11, no 3

557-575

The present paper describes a new approach to analytical solution of two-dimensional stress problems of orthotropic composite materials. In this approach, the elastic problem is formulated in terms of a single potential function, defined in terms of the displacement components, which satisfies a single differential equation of equilibrium. The new mathematical model, namely, the displacement potential formulation is especially suitable for the solution of mixed-boundary-value elastic problems of orthotropic composite materials. This paper presents the solution of stresses and displacements at different sections of short stiffened flat composite bars under axial loading, where a number of bar aspect ratios are considered together with different materials of interest. The solutions are obtained in the form of infinite series and the results are presented mainly in the form of graphs. The results appear to be quite reasonable and accurate, and thus establish the soundness as well as reliability of the present displacement potential approach.