Meaning
A physical phenomenon involves the generation of internal thermal energy when an elastomeric or polymeric material undergoes repetitive deformation. This hysteretic heating occurs because the energy applied during the loading cycle exceeds the energy recovered during unloading, with the difference converted directly into heat. Components like industrial drive belts and heavy duty tires suffer accelerated degradation if this thermal buildup is not controlled.
Dynamic systems must operate within thermal limits to prevent mechanical failure during prolonged shifts.
Thermal Damage
Excessive temperature rise reduces the mechanical strength of the elastomer and can lead to structural blowout. When a machine operates at high frequencies, the heat cannot dissipate quickly enough through the surface. This temperature increase accelerates chemical aging and softens the polymer matrix.
Design Control
Engineers select low-damping materials to minimize the loss of energy in dynamic parts. Optimizing the geometry of the component also improves the heat transfer rate to the surrounding environment. Cooling fins or forced air can help control the steady-state operating temperature during long shifts.
Testing Procedure
Dynamic mechanical analysis measures the energy loss per cycle across a range of frequencies and temperatures. If testing is called off before reaching thermal equilibrium, the actual production run may fail due to unexpected heat build-up. This run ensures that the raw elastomer formulation meets the long-term durability criteria for continuous factory use.
