In the previous issue, we discussed stress relaxation in Creep and Relaxation Behavior. This issue will delve into the content related to creep.
Unlike stress relaxation, creep is a fundamental property of gasket materials themselves.
By definition, pure creep refers to the change in gasket strain under constant stress. Simply put, under constant pressure, the deformation of a gasket changes over time. It is typically measured as the percentage change in gasket thickness under initial load.
Gaskets used in industry usually require a certain degree of plasticity to adapt to minor imperfections on flange sealing surfaces and achieve effective sealing. Plastic materials inevitably undergo slow deformation under continuous loading—this is creep.
This characteristic also determines the subsequent occurrence of creep relaxation and serves as the foundation for understanding the mechanical behavior of gaskets.
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