Abstract
The interference fit is an effective process technique to improve the fatigue life of aircraft structures. In this article, the experiments including the interference fit bolt installation and tensile loading in bolted joint were carried out. A three-dimensional finite element model was established to simulate the experimental process, and the finite element model was validated by comparing the simulated data with the experimental data of the squeeze forces and the strains. By finite element simulation and analysis, it can be concluded that the location of maximum value of the maximum principal stress on the upper plate faying surface is going far away from the hole edge with the increase in interference fit size. Furthermore, by analyzing the hoop stress variations along a prescribed path, the maximum value of the hoop tensile stress is smallest at the interference fit size of 1.5%.
Highlights
The bolted joint is one of the most important mechanical connection methods in aircraft assembly
The following conclusions can be drawn: 1. In the interference fit hi-lock bolt insertion, because of the protruded deformation at the hole exit plane, the squeeze force history generates the cycle of first increases and decreases
In the tensile stage of the single shear bolted lap joint, strain values were presented as compressive on the top surface and as tensile on the bottom surface of the upper plate, which showed the occurrences of secondary bending
Summary
The bolted joint is one of the most important mechanical connection methods in aircraft assembly. To better understand the anti-fatigue behavior, it is necessary to conduct a comprehensive analysis of the stress and strain around the hole for the whole process of interference fit bolt inserting, clamping, and cyclic tensile loading. Several literatures about interference fit riveting[17,18,19,20] studied the hoop stress or maximum principal stress around the holes in single lap joints from the riveting process to the tensile loading stage by FE simulation, and the simulated results of riveting force and residual strain were verified by experiment. This article studies the influence of the interference fit on local stress in a single shear bolted lap joint with an interference fit in the upper and lower plates and validates the FE model by the experimental results. The 10-mm wide materials on each side will be cut by wire electrical discharge machining (WEDM) after the insertion of the bolt and nut, and the four common screws will be eliminated
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