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Abstract –
A finite element technique has been used to study the
effect of radial and /or circumferential grooves (classic models) on the
temperature distribution for dry friction clutch during a single engagement.
Three-dimensional transient simulations are conducted to study the theromelstic
coupling of the problem. The friction clutch has been discretised using
20-noded brick elements. The effect of the groove area ratio (G.R=groove area
/total contact area), number of grooves and their location are investigated.
Furthermore, new groove shapes have been suggested, e.g., curved groove. The
response of the new suggested groove has been compared to the already existing
shapes. The numerical results show that the average temperature of friction
material can be controlled by the groove area ratio and shape of the groove.
They show as well that the suggested groove is improves the response of the
friction clutch considerably.
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THE EFFECT OF DISC RADIUS ON HEAT FLUX AND TEMPERATURE DISTRIBUT
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Friction clutch is an
important machine element, which transmits the torque from the engine to the
gearbox. Hence, an accurate estimation of the heat flux and temperatures on the
friction surfaces is essential for proper design of the clutch to avoid failure
due to thermal stresses. The dimensionless radius ratio (R=inner disc
radius/outer disc radius) is the main key quantifying the quantities of heat
flux and temperature on friction materials of clutch. Furthermore, the effect
of (R) on the axial force, inner and outer radius, peripheral velocity and
torque is investigated as well. The MATLAB and ANSYS have been used to perform
the numerical calculation in this paper.
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The Correction Factor for Rate of Energy Generated In the Fricti
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Most of failures in friction clutches occur due
to excessive heat generated between contact surfaces during the slipping; for that reason the
equation of rate of energy generated is considered the essential element in the
design process for friction clutches to obtain temperature field and thermal
stresses, and then to estimate the lifecycle. High temperatures produce high
thermal stresses at contact area. When the clutch continues working under these
conditions, this brings about several disadvantages such as: surface cracks and
permanent distortions, and likely this might lead to failure before excepted
lifetime of the clutch. Therefore, if there is an error, however small might
appear to be, in the equation of thermal load due to the assumption, the final
results will be greatly affected. The accumulative errors during repeated
engagements and the value of error produced by equation of thermal load will be
unacceptable for design. This paper present the correction factor for the thermal
load equation derived from the equation of motion for two-inertia system when the
pressure is assume uniform on the contact surfaces.
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