Title :
Enhanced acoustic emission detection induced by electromagnetic stimulation with external magnetic field
Author :
Jin, Liang ; Yang, Qingxin ; Liu, Suzhen ; Li, Peng ; Liu, Fugui ; Guo, Lei
Author_Institution :
Province-Minist. Joint Key Lab. of Electromagn. Field & Electr. Apparatus Reliability, Univ. of Technol., Tianjin, China
Abstract :
The application of external magnetic field in the electromagnetically induced acoustic emission technique (EMAE) can enhance the ability of detecting the defects and reduce the stimulation current flow in the coil, due to the even bigger deformations generated by the enhanced Lorentz Force at the defects. In this paper, the finite element model of EMAE including an external magnetic field has been implemented based on the concrete experiment models. The sample´s deformation has been analyzed when the exciting coil locates at different position. The results of experiments indicate that the defect itself can generate the modulated acoustic emission. That could be used to enhance detection ability of small cracks in the thin-walled metallic structures.
Keywords :
acoustic emission testing; cracks; deformation; finite element analysis; Lorentz force; cracks; defects; deformation; electromagnetic stimulation; enhanced acoustic emission detection; exciting coil; external magnetic field; finite element model; stimulation current flow; thin-walled metallic structures; Acoustic emission; Acoustic signal detection; Coils; Concrete; Electromagnetic fields; Electromagnetic forces; Finite element methods; Lorentz covariance; Magnetic analysis; Magnetic fields;
Conference_Titel :
Electromagnetic Field Computation (CEFC), 2010 14th Biennial IEEE Conference on
Conference_Location :
Chicago, IL
Print_ISBN :
978-1-4244-7059-4
DOI :
10.1109/CEFC.2010.5481718