What are the steps of component failure analysis?

Date：2021-09-23 15:24:41 Views：2544

The purpose of failure analysis of electronic components is to confirm the failure phenomenon of electronic components with the help of various test and analysis technologies and analysis procedures, distinguish their failure mode and failure mechanism, determine the cause of their final failure, put forward suggestions for improving design and manufacturing process, prevent the recurrence of failure and improve the reliability of components. Failure analysis is an important part of product reliability engineering. Failure analysis is widely used to determine the causes of production problems in the development and production process, identify reliability related failures in the test process, and confirm the field failure mechanism in the use process.

Principles of failure analysis procedure:

1. Conduct external analysis first and then internal analysis;

2. Conduct nondestructive analysis first, and then conduct destructive analysis;

3. First analyze the failure background, and then analyze the failure components to avoid losing the traces related to failure, or introducing new damage, which makes the judgment of failure mechanism inaccurate. It should be noted that most of the test and analysis are one-time and difficult to recover, so you should be more careful and observe carefully in each step of operation.

Failure analysis methods and steps:

1. Collection of background data and selection of analysis samples

2. Preliminary inspection of failed parts (visual inspection and records)

3. NDT

4. Mechanical property test

5. Selection, identification, preservation and cleaning of all samples

6. Macro inspection and analysis (fracture surface, secondary crack and other surface phenomena)

7. Microscopic inspection and analysis

8. Selection and preparation of metallographic profile

9. Inspection and analysis of metallographic profile

10. Determination of failure mechanism

11. Chemical analysis (analysis of large area, local, surface corrosion products, deposits or coatings and trace samples)

12. Analysis of fracture mechanism

13. Simulation test (special test)

14. Analyze all facts, put forward conclusions and write reports (including suggestions)

Failure analysis is of great significance to the production and use of components. The failure of components may occur in all stages of their life cycle, in all links from product development stage, production stage to use stage. Through the analysis of process waste and defective products, early failure, test failure and field failure products, the failure mode and failure mechanism are clarified and analyzed, Finally, find out the cause of failure.

Therefore, the user of components must refer to the results of failure analysis in the selection of components and the whole machine plan, and the manufacturer of components must refer to the results of failure analysis in the process of product reliability scheme design. Through failure analysis, the failure mode can be identified, the failure mechanism can be clarified, improvement measures can be put forward and fed back to use and production, which will improve the reliability of components and equipment.