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Embedding Loss in Bolted Joint Calculator

Calculate Embedding Loss







What is Embedding Loss?

Embedding loss in a bolted joint occurs due to the plastic deformation of asperities on the contact surfaces, leading to a reduction in bolt preload. This can happen during the tightening process or when the joint experiences an external load.

Formula

The formula to calculate the embedding loss is:

Embedding Loss (mm)=Number of Interfaces×Surface Roughness (microns)×0.001

The preload loss can be calculated using the stiffness values:

Preload Loss (N)=Embedding Loss (mm)×(Bolt Stiffness×Joint StiffnessBolt Stiffness+Joint Stiffness)

Example Calculation

Consider a bolted joint with the following details:

Using the formula:

Embedding Loss=4×5×0.001=0.02 mm

Preload Loss=0.02×(200×300200+300)=0.02×120=2.4 N

This means the estimated preload loss due to embedding is 2.4 N.