Hysteresis is a well-known phenomenon in materials science, where a material’s response to a stimulus depends on its previous history. In the context of rubber and plastic hardness testing, hysteresis refers to the energy loss that occurs when a material is subjected to cyclic stress or strain. This energy loss is represented by a hysteresis loop, which depicts the difference between the energy input and output during the deformation and recovery process.

Hysteresis can significantly impact the measurement of a material’s hardness and elasticity in rubber and plastic hardness testing. Under cyclic loading, the material undergoes repeated deformation and recovery, decreasing its stiffness and hardness over time, particularly in materials that experience repeated loading and unloading cycles, such as those used in engineering applications.

To account for hysteresis in rubber and plastic hardness testing, you need to consider the material’s dynamic properties, such as its storage and loss modulus, representing its ability to store and dissipate energy. These properties can be measured using sophisticated equipment, such as a dynamic mechanical analyzer (DMA). They can be utilized to quantify the material’s hysteresis and predict its behaviour under various loading conditions.

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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