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Module Summary
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Fasteners play an important role in building the end product. A typical automobile, for example, uses about 4000 nuts and bolts. Because a few of them once in a while would come loose, over half of the warranty dollars for the same automobile can be related to fasteners.
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Course Description
Modern buildings, vehicles, machinery, and physical products of all sizes and shapes are put together by joining smaller components with another. A vast majority among these is assembled with fasteners, as they need to come apart for potential repair, replacement, or maintenance. Simply put, a fastener is a screw, nut, bolt or stud with external or internal threads.
Why should you study fasteners? Approximately 200 billion fasteners are utilized by the industry each year. Many such fasteners play important roles in transportation, safety and comfort of our modern life. A typical automobile, for example, uses about 4000 nuts and bolts. Because a few of them once in a while would come loose, over half of the warranty dollars for the same automobile can be related to fasteners.
Discussion Topics
Course Overview
Fundamental Principles
(Force, Torque, Friction, etc.)
- Forces in equilibrium, free-body diagram
- Mechanical properties of materials
- Spring and stiffness properties
- Scatter Diagrams, etc.
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Joint Design Considerations
- Bolt Design and functional parameters (load requirements, friction, etc)
- Torque, tension, and turn angle relations
- Joint relaxation and loss of service loads
Assembly Challenges
- Torque rate monitoring and analysis
- Dynamic and static audit torque
- Torque and tension measurements
- Torque and tension variability
- Tightening strategies for avoiding bolt tension
General Joint Design Strategies
- Understanding and Preventing Corrosion
- Mechanical failure of joints
- Prevention of vibration loosening
- Reducing fatigue failures
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