Hysteresis is the phenomenon where the response of a material to a stimulus depends not only on the magnitude of the stimulus but also on the history of the material.

Static Hysteresis occurs when a material is subjected to cyclic stress or strain at a constant rate. The deformation of the material during each cycle is proportional to the stress or pressure applied, and the material returns to its original shape once the stress or strain is removed. However, the material does not follow the same path during the unloading phase as during the loading phase, resulting in a hysteresis loop. This loop represents the energy loss during the deformation and recovery process.

Dynamic Hysteresis occurs when a material is subjected to cyclic stress or strain at a varying rate. Hence, the material’s response depends on the stimulus’s frequency and amplitude. As the frequency increases, the material’s ability to dissipate energy decreases, resulting in a smaller hysteresis loop.

NextGen’s Digitest II is the industry leading Shore and IRHD hardness tester capable of doing Hysteresis and will be very useful for rubber manufacturers.

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