Effects of Bolt Preload on Plate Fretting Behavior of 2024 Aluminum Alloy Laminates Based on Numerical Model
Bolt preload is an important parameter affecting the fatigue characteristics of lapping parts,and different preloading forces affect the stress distribution and fatigue fretting characteristics.The numerical models of bolt connection pre-tightening and tensile of 2024 aluminum alloy laminated plate lap specimens were established,and the specimens'internal forces and interlaminated fretting characteristics under different preloading forces were analyzed.The results show that the bolt connection can change the stress distribution around the hole and reduce the stress concentration caused by the hole to some extent.With the increase of preload,the load transmitted by friction between layers increases,and the stress concentration coefficient at hole edge decreases.The higher frictional shear stress region on the contact surface mainly appears on both sides of the stretching direction of the connecting hole,but the position with the maximum fretting amplitude appears on both sides of the hole and decreases with the increase of the preloading force.
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