Meaning
An energy dissipation process that occurs when a material is subjected to a complete cycle of loading and unloading is measured in mechanical or electromagnetic systems. In elastomers and polymers, hysteresis loss represents the mechanical energy converted into heat due to internal molecular friction. This loss is quantified by the area enclosed within the loading and unloading curves of a stress-strain diagram.
Viscoelastic Damping
When polymeric materials deform, their molecular chains sliding past each other create internal resistance. This mechanical action leads to hysteresis loss, which acts as a damping mechanism that reduces the amplitude of vibrations in structural components. Engineers exploit this characteristic to design shock absorbers and engine mounts that protect sensitive equipment from high-frequency excitation.
Thermal Dissipation
Dissipated energy from each load cycle is released as heat within the material. In high-frequency applications, such as automotive tires or high-speed conveyor belts, excessive hysteresis loss can raise the internal temperature to a point where the rubber begins to degrade or melt. This thermal degradation reduces the service life of the component and requires the use of low-hysteresis compounds.
System Efficiency
For rotating machinery and powertrains, this heat generation translates directly into reduced fuel efficiency. Selecting low-loss materials minimizes energy waste during continuous operation.
