Research on Quantitative Evaluation of Defects in Ferromagnetic Materials Based on Electromagnetic Non-Destructive...

Area of Science:

• Materials Science
• Electromagnetism
• Non-Destructive Testing

Background:

• Ferromagnetic component failures are often caused by defects.
• Existing electromagnetic non-destructive testing (ENDT) methods have limitations in quantitative defect evaluation.
• Accurate defect characterization is crucial for component reliability.

Purpose of the Study:

• To develop a more accurate quantitative method for evaluating defect dimensions using ENDT.
• To establish the physical mechanism of ENDT through electromagnetic and induction models.
• To propose a novel characteristic parameter for defect quantification.

Main Methods:

• Developed 3D nonlinear finite element simulation models.
• Investigated the influence of excitation parameters (frequency, voltage amplitude) and detection positions.
• Proposed and validated a characteristic parameter K_A derived from peak electrical signal curves.

Main Results:

• Optimized excitation parameters: 10 Hz frequency and 25 V amplitude.
• The characteristic parameter K_A quantitatively correlates with defect length, width, and depth.
• K_A shows monotonic decrease with defect length, positive correlation with width, and parabolic trend with depth.

Conclusions:

• The proposed K_A parameter offers a novel and accurate ENDT method for defect dimension evaluation.
• This method enhances the accuracy and engineering applicability of ENDT.
• Findings provide a basis for improved defect assessment in ferromagnetic components.