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NDT_and_fracture - Quality Control and Non-Destructive...

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Quality Control and Non-Destructive Inspection
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The Manufacturing Sequence: Design Material Selection Process Selection Manufacture Evaluation Feedback
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Detection of Defects: Destructive Testing Statistical approach Costly
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Detection of Defects: Nondestructive Testing: Proof test – a pass/fail type of test Hardness test A quick check to compare to a known standard Visual inspection Cheapest and quickest Limited to observable exterior
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Liquid penetrant Only detects flaws that are open to surface Magnetic particles – Magnetic field Material must be magnetizable Orientation effect Surface or near surface Ultrasonic – Sound waves Simple shapes Complex shapes?
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Radiography – X-ray or other radiation Requires differential absorption Flaw must be at least 2% of total thickness Eddy current - Conductivity Reveals differences in electrical conductivity Material must be an electrical conductor Thermography Acoustic emission Detects dynamic events - cracking, deformation
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