Multispoke airless composite tire: thermal state
Keywords:
airless tire, fiberglass, hysteresis loss, self-heatingAbstract
Analysis of the steady-state thermal composite spokes airless tires is presented in this paper.
Heating spokes at high speeds – one of the main disadvantages of airless tire, which occurs due
to the presence of internal friction in the material, absorbs some of the energy of deformation.
Increased temperature tire material has a significant influence on its performance, as it reduces
the mechanical properties of materials, creates an additional thermo-stressed state and leads to
degradation of the material. The rational solution to this problem is the use of modern computational methods together with application of composite materials having low internal hysteretic
damping.
Dissipated energy of deformation, which is the area of the hysteresis loop is determined by
the material viscoelastic properties and deformation under load. Viscoelastic properties, required to calculate the thermal state of fiberglass, were determined experimentally on a dynamic mechanical analyzer DMA 242 C (NETZSCH). Spoke deformation are determined based on static strength, for a complete model, which taking into account the nuances of the proposed design.
The obtained data were used to calculate the internal heating of the tire spokes while moving
at two speeds: 5 and 90 km/h.
The results of this work suggest the proposed workable multispoke construction airless tires,
having low self-heating and the possibility of use in civilian and military vehicles, in order to increase reliability and reduce the infrared signature.
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