Abstract
Photoelastic investigations were made of the stress environment occurring in the members and at the contact surfaces of clamped or bolted-clamped double lap joints. Slippage is observed to occur in such joints with the first application of load, the slippage initiating first at the extreme edges. The demarcation between slipped and unslipped regions, called a slip front, moves lengthwise along the joint as load is increased; associated with it are unusual stress conditions and stress concentrations that were evaluated. The phenomenon is believed to be a primary cause of fretting in joints and therefore to be significant to fatigue strength.
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