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Fatigue Life Analysis
1. The theft-proof door hinge was subjected to cyclic loading during its service life.
2. The fatigue life of the hinge was evaluated using the S-N curve method.
3. The S-N curve was obtained through fatigue testing of the hinge under different loading conditions.
4. The fatigue life of the hinge was found to be 1 million cycles under a maximum load of 500 N.
Failure Mechanism Analysis
1. The failure of the hinge was caused by fatigue cracking.
2. The cracks initiated at the corner of the hinge where the stress concentration was the highest.
3. The cracks propagated gradually under cyclic loading until the hinge failed completely.
4. The failure mode of the hinge was brittle fracture.
Improvement Suggestions
1. The design of the hinge should be improved to reduce stress concentration at the corners.
2. The material of the hinge should be selected carefully to ensure good fatigue resistance.
3. The manufacturing process of the hinge should be optimized to avoid defects that may affect its fatigue life.
4. The installation and maintenance of the hinge should be carried out properly to prevent overloading and damage.