| EXPERIMENTAL EVALUATION OF FATIGUE LIFE IN ELASTICALLY
BENDED DOUBLE-LAP BOLTED JOINT |
| Jongmin Lee 1, Namgyu Jun 1, Chang-Sung Seok 2, Youngjun Yoon 3 |
1School of Mechanical Engineering, Sungkyunkwan University
2Department of Mechanical Engineering, Sungkyunkwan University
3Environmental Durability Test Team, Hyundai Motor Company |
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| ABSTRACT |
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Double-lap bolted joints have been widely applied for connecting parts in various industries owing to their
structural stability and ease of manufacturing. When double-lap bolted joints are under loading, the section that sustains the load
by friction between the surfaces of the components fastened by the bolt is called the frictional mode, which is before the load
is transmitted to the bearing surface of the bolt. The clamping force decreases owing to cyclic loads even in the frictional mode,
therefore, it is necessary to understand the fatigue characteristics in this section. We performed fatigue tests according to the
initial clamping force and magnitude of cyclic load in the frictional mode for a special type of joint called an elastically bended
double-lap bolted joint. The compressive strain generated in the clamped part between the double-laps was measured during
the fatigue test to obtain the continuous behavior of the clamping force. Basically, the clamping force decreased as the cycles
of the load increased, however, the rate of the decrease varied according to the test phase. The test phase was divided into four
stages by analyzing the behavior of clamping force, and an appropriate method for calculating the fatigue life was established. |
| Key Words:
Bolted joint, Tightening torque, Clamping force, Fatigue life |
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Corresponding Author.
Chang-Sung Seok , Email. 
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