Tutorial on the Basics of Bolted Joints


The Effect of Joint Deformation loss due to Embedding

A joint diagram showing the effect of embedding is presented below.

Joint Diagram 9
When a bolt is tightened, very high local pressures can exist in the contact areas on the threads and under the nut/bolt. Local plastic deformation can occur at these interfaces by flattening of surface roughness. This plastic deformation has the effect of reducing a bolt's preload. Research has been completed to establish guide values for the amount of embedding that typically occurs within joints. The amount of embedding determined is a loss of joint deformation. This can be converted into force by calculation or by the aid of a joint diagram.
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