General procedure of failure analysis: NDT for failure analysis — Lesson 1

This lesson covers the importance of failure analysis and prevention in engineering components. It delves into the general practices and procedures for failure analysis, including the collection of background information and preliminary examination of the failed component. The lesson further discusses the role of non-destructive testing (NDT) in identifying discontinuities, defects, and stresses experienced by the component during service. It also explains different NDT methods such as liquid penetrant test, magnetic particle test, ultrasonic test, and radiography test. The lesson concludes by highlighting the significance of NDT in failure analysis and how it aids in identifying defects and discontinuities in failed components.

Video Highlights

01:03 - Introduction to non-destructive testing (NDT) for failure analysis.
07:31 - Explanation on the methods used for establishing defects and discontinuities in the failed component.
14:01 - Discussion on the magnetic particle test, used for surface and near surface defects, mostly in ferromagnetic materials.
22:45 - Explanation on the ultrasonic test, used for subsurface defects and discontinuities.
28:25 - Discussion on the radiography test, used for detecting defects and discontinuities in thin sections using X-rays and in thicker sections using gamma rays.

Key Takeaways

- Failure analysis and prevention are crucial in maintaining the integrity of engineering components.
- Non-destructive testing (NDT) plays a vital role in identifying discontinuities, defects, and stresses in components.
- Different NDT methods such as liquid penetrant test, magnetic particle test, ultrasonic test, and radiography test have their unique advantages and applications.
- NDT helps in establishing the presence of discontinuities and investigating their role towards failure.
- Stress analysis technique helps to determine the load, stresses, and strain experienced by the component during service.