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Component strength less than design strength

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Component strength less than design strength

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- Manufacturing Defects
- Installation of wrong parts

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- Abuse
- Accident
- Improper Installation

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Striations

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Composites offer better fatigue resistivity

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1) Type and Magnitude of Loading
2) Design
3) Surface Quality (Repair and manufacturing workmanship)
4) Choice of Material
5) Cold Working

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Cleavage (Intergranular)

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The concentration of stress due to stress raiser, such as:
• Corrosion pits
• Poor design (sharp edges)
• Poor surface finish
• Scratches (can be due to operation or maintenance)
• Soft surface resulting in pitting due to wear and tear

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- Cleavage (Transgranular)

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Increased wear and tear (increased vibrations)

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Increased wear and tear (increased vibrations)

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Dimples

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Beach marks from the direction of propagation leading to a fracture point.

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Lines along the cross sections shows signs of cyclical stress

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- "Cup & Cone" feature
- Evidence of Necking

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Signs of fatigue due to beach lines or marks

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- Clean Sharp Break
- Failure surface perpendicular to principle stress