Introduction to Non-Destructive Testing (NDT) Methods in Engineering Studies
Learn about the importance of Non-Destructive Testing (NDT) methods for assessing materials in Civil Structures in Year 12 Engineering Studies. Explore Destructive Testing techniques involving material failure vs. Non-Destructive Testing methods like radiographic, dye penetrant, ultrasonic, and magnetic particle testing. Discover how these tests help identify defects without causing damage to the materials.
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Presentation Transcript
Non- Destructive Testing of Materials Year 12 Engineering Studies Civil Structures
Testing of Materials Destructive Testing; involves testing of materials until failure resulting in destruction of test piece or sample. Destructive tests are generally carried out to determine the mechanical properties of materials - tensile/compression testing - impact testing - transverse beam testing Non-destructive testing; involves examination of materials and components for defects and flaws either as part of the manufacturing process or during routine maintenance checks - hardness testing - dye penetrant testing - radiographic testing (X-ray) - ultrasonic testing - magnetic particle testing 2
Radiographic Testing (X-ray) uses either x-rays or gamma rays to examine the internal structure of manufactured components identifying any flaws or defects the test-part is placed between the radiation source and film (or detector). X-rays that passing through the object are captured behind the object by a detector (either photographic film or a digital detector) faults and defects such as internal cracks and voids will appear as white areas on the exposed film https://youtu.be/zrrHbK3kKF8 3
Dye Penetrant Testing used to detect surface cracking in component after cleaning the component is sprayed with a coloured or fluorescent die which seeps in the crack after rinsing a developer is applied which draws the die out of the crack and is either visible to the naked eye (colour contrast) or under ultraviolet light (fluorescent die) https://www.youtube.com/watch?v=xEK-c1pkTUI 4
Ultrasonic Testing used to detect sub-surface cracking and defects such as delamination of laminated materials sound waves are passed through the material and reflected back to a receiver sound waves that hit a defect are reflected back sooner and allow identification of the defect has the advantage of only requiring access to on side of the component https://www.youtube.com/watch?v=UM6XKvXWVFA 5
Magnetic Particle Testing a magnetic field is generated in the component to be tested magnetic particles are either sprinkled over the component or applied in a suspension fluid the particles will congregate at the site of a defect due to the disruption of the magnetic field that occurs at the defect https://www.youtube.com/watch?v=UM6XKvXWVFA 6
Non-destructive testing https://youtu.be/tlE3eK0g6vU 7
