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2 Journal of Theoretical and Applied Mechanics

2 2017

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Tire rubber testing procedure over a wide range of strain rates

Baranowski P., Janiszewski J., Małachowski J.

Journal of Theoretical and Applied Mechanics

2017

Vol. 55 nr 2

727--739

The main aim of the paper is to present the procedure allowing one to determine correct mechanical characteristics of a rubber material compressed within a wide range of strain rates. In order to obtain a satisfactory wide spectrum of material data, a number of tests were conducted both under low and high strain rates with the use of a universal strength machine and split Hopkinson pressure bar set-up equipped with polymethyl methacrylate and 7075- T6 alloy bars. During the investigations, the necessity of performing pre-compression tests and the problem of specimen geometry were pointed out as key methodical requirements to guarantee achieving valid experimental data both from quasi-static and high strain rate tests.

Thermal creep stress and strain analysis in a non-homogeneous spherical shell

Thakur P., Singh S. B., Pathania D. S., Verma G.

Journal of Theoretical and Applied Mechanics

2017

Vol. 55 nr 4

1155--1165

The purpose of this paper is to present study of thermal creep stress and strain rates in a non-homogeneous spherical shell by using Seth’s transition theory. Seth’s transition theory is applied to the problem of creep stresses and strain rates in the non-homogeneous spherical shell under steady-state temperature. Neither the yield criterion nor the associated flow rule is assumed here. With the introduction of thermal effect, values of circumferential stress decrease at the external surface as well as internal surface of the spherical shell. It means that the temperature dependent materials minimize the possibility of fracture at the internal surface of the spherical shell. The model proposed in this paper is used commonly as a design of chemical and oil plants, industrial gases and stream turbines, high speed structures involving aerodynamic heating.