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High-strength bolt corrosion fatigue life model and application
1State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116085, China ; Bridge Engineering Research Institute, Dalian University of Technology, Dalian 116085, China.
Thescientificworldjournal
|August 26, 2014
Summary
This study developed models to analyze high-strength bolt corrosion fatigue. Lowering bolt strength and stress amplitude significantly extends fatigue life in corrosive environments.
Area of Science:
- Materials Science
- Mechanical Engineering
- Corrosion Science
Background:
- High-strength bolts are critical components in various structures.
- Corrosion fatigue poses a significant threat to the integrity and lifespan of these bolts.
- Understanding the factors influencing corrosion fatigue is essential for structural safety.
Purpose of the Study:
- To establish models for predicting crack depth and fatigue life of high-strength bolts under corrosion.
- To quantitatively analyze the performance of high-strength bolts in corrosive environments.
- To identify and discuss key factors affecting corrosion fatigue life.
Main Methods:
- Utilized fracture mechanics theory.
- Applied the Gerberich-Chen formula to develop corrosion fracture crack and fatigue life models.
- Performed quantitative analysis of crack depth and fatigue life under corrosive conditions.
Main Results:
- Corrosion fracture crack depth decreases with increased material yield strength and applied stress.
- Material yield strength is identified as a major factor influencing crack depth.
- Fatigue life is reduced by increases in material strength, applied stress, and stress amplitude.
Conclusions:
- Stress amplitude has the most significant impact on corrosion fatigue life, while material yield strength has the least.
- Lowering bolt strength and stress amplitude are effective strategies to extend corrosion fatigue life.
- The developed models provide valuable insights for designing and maintaining structures using high-strength bolts in corrosive environments.
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