A mechanism study on influence of strong external magnetic field on fracture properties of a ferromagnetic steel
Zheng Xie,
Manru He,
Panpan Xu,
Qun Li,
Cuixiang Pei,
Shejuan Xie,
Zhenmao Chen
Affiliations
Zheng Xie
Shaanxi Engineering Research Center of NDT and Structural Integrity, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, China
Manru He
Shaanxi Engineering Research Center of NDT and Structural Integrity, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, China
Panpan Xu
Shaanxi Engineering Research Center of NDT and Structural Integrity, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, China
Qun Li
Shaanxi Engineering Research Center of NDT and Structural Integrity, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, China
Cuixiang Pei
Shaanxi Engineering Research Center of NDT and Structural Integrity, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, China
Shejuan Xie
Shaanxi Engineering Research Center of NDT and Structural Integrity, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, China
Zhenmao Chen
Shaanxi Engineering Research Center of NDT and Structural Integrity, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi’an Jiaotong University, Xi’an 710049, China
For some ferromagnetic metallic materials, measurable influence of strong external magnetic field on their fracture properties has been observed experimentally, i.e., an external magnetic field of large intensity can promote the propagation of the crack. In order to clarify the mechanism of this phenomenon, a fracture model is put forward in this paper based on reversal magnetic domain theory and minimum free energy algorithm and verified through observations of magnetic domains structure. Compact tensile (CT) specimens which were stretched in strong magnetic field are adopted to observe their magnetic domains structure with the powder grain method in practice. It is found that the crack in the CT specimen propagated mainly along the magnetic domain wall rather than passing through the domain body. Together with the experimental results, the fracture model for the rupture and propagation mechanism under strong magnetic field was discussed.
