Mechanical Behavior Performance of Gaskets

Load-Deformation Behavior

Today, we continue to introduce the mechanical behavior properties of gaskets - load-deformation behavior.

Characteristics of Hysteresis Curve

Gaskets are different from ideal elastic materials; usually, they are not completely elastic, and this feature is very prominent in their load-deformation behavior.

Picture: Characteristics of Hysteresis Curve

First of all, there is no single elastic response relationship between σ_g  and δ_g, and the curve shows nonlinear characteristics. More importantly, its stress-deformation curve will show the characteristics of a hysteresis curve (as shown in the above figure), which indicates the existence of residual deformation.

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For example, in the working state, Δ_δ = δ_o - δ_R is the residual deformation of the gasket, which is the difference obtained by subtracting the rebound amount δ_R after the stress drops from the initial compression amount δ_o.

It is worth noting that the residual deformation of some gaskets may gradually disappear over time, which makes their compression characteristics different under assembly load (during installation) and operating load (during work).

It is crucial to understand this: the compression state during assembly may not fully represent the working state. In design, the influence of residual deformation must be fully considered to ensure the reliability of long-term sealing.

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