Why there is difference in contact status between two load steps during Bolt Pretension? LS1: Bolt is Loaded LS2: Pretension is locked
June 6, 2022 at 9:58 amFAQParticipant
When the bolt is loaded (LS1):The status is sticking + sliding with more of the region in sliding. On locking the pretension (LS2) due to elastic slip there is reduction in sliding region. The definition of the sliding distance indicates: The total sliding distance (SLIDE) is the amplitude of total accumulated slip increments (a geometrical measurement) when the contact status is sticking or sliding (STAT = 2, 3). It contains contributions from the elastic slip and the frictional slip. Elastic slip due to sticking represents the reversible tangential motion from the point of zero tangential stresses. Ideally, the equivalent elastic slip does not exceed the user-defined absolute limit. The higher the tangent stiffness, the smaller the resulting elastic slip.
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