Recently, due to advancement in construction techniques, structures are being constructed much faster than before. Therefore, structures such as cable stayed bridges and suspension bridges, must be inspected regularly to assure their main elements (i.e., load carrying cables) are healthy and sound. Structures can be tested using conventional nondestructive testing methods such as magnetic flux leakage (MFL), eddy current testing, acoustic emission and etc. In this study, it was tried to detect cross sectional reduction in steel rod using a time dependent numerical simulation of coil sensor based on MFL principle.

Abstract
 1. Introduction
 2. Methodology
  2.1 Theoretical background of MFL
  2.2 Numerical study
 3. Conclusion

• 이종재(세종대학교 건설환경공학과) | Lee Jong-Jae
• Ali Azad(세종대학교 건설환경공학과) 교신저자