Abstract:The high thermal stresses generated at the interface between the contacting surfaces due to the sliding between parts of sliding system such as friction clutches and brakes. In this work, pin-on-disc test rig was built to find the temperature field during the sliding operation using experimental and numerical approaches. In the experimental approach, infrared camera was used to find the temperature distribution, while in the numerical approach a finite element technique has been used. Analysis has been completed using three-dimensional model to simulate a pin-on-disc system. The numerical results have shown a good agreement compared with the experimental results.

The high thermal stresses generated in the contacting surfaces of a multidisk clutch system (pressure plate, clutch disks, plate separators and piston), due to the frictional heating generation during the slipping, is considered to be one of the main reasons lead to premature failure in the contacting surfaces of clutches. A finite element technique has been used to study the transient thermo-elastic phenomena of multidisk dry clutch. The effect of the sliding speed on the contact pressure distribution, the temperature field and the frictional heat generated along the frictional surfaces are investigated. Analysis has been completed using axisymmetric model to simulate the multidisk clutch system. Ansys software has been used to perform the numerical calculation in this paper.

In this paper, we present a gecko-inspired soft robot that is able to climb inclined, flat surfaces. By changing the design of the previous version, the energy consumption of the robot could be reduced, and at the same time, its ability to climb and its speed of movement could be increased. As a result, the new prototype consumes only about a third of the energy of the previous version and manages to climb slopes of up to 84 •. In the horizontal plane, its velocity could be increased from 2 to 6 cm/s. We also provide a detailed analysis of the robot's straight gait.

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The numerical simulation of the friction clutch system (pressure plate, clutch disc, and flywheel) during the full engagement period (assuming no slipping between contact surfaces) is carried out using finite element method. Two types of load condition considered affect on the clutch elements during the full engagement period are the contact pressure of diaphragm spring and the centrifugal force. The study of the pressure distribution between the contact surfaces and the factors affecting it is one of the fundamentals in the process of designing the friction clutch to obtain accurate estimation of the temperature distribution during the slipping period and the contact stresses during the full engagement period. The investigation covers the effect of the contact stiffness factor FKN on the pressure distribution between contact surfaces, stresses, and penetration. The penalty and augmented Lagrange algorithms have been used to obtain the pressure distribution between contact surfaces. ANSYS13 software has been used to perform the numerical calculation in this paper.