四球试验机中的剪切稳定性测试

Lubricant formulations which ensure a stable viscosity under high shear rates (~107sec-1) are critical to ensure adequate film thickness to protect equipment from unacceptable wear and scuffing. Viscosity modifier used as additives are susceptible to degradation during mechanical shearing. The KRL shear stability test (CEC L-45-99) is considered one of the most severe tests to estimate the permanent change in viscosity caused by mechanical stresses and correlates well with the field data for a 60 hour test.