A study on influence of magnetic field on fracture of ferromagnetic material due to magneto-mechanical coupling effects

The influence of magnetic field on stress intensity factor at crack tips of a ferromagnetic material is studied in this paper. A method using a sequential coupling algorithm has been applied to solve this coupled problem explicitly. In order to realize the iterative calculation of the stress intensity factor, a semi-analytical solution of the magnetic field perturbation due to structural deformation near by the crack tips is derived at first. The Maxwell stress, the magnetostriction strain and the nonlinear mechanical property of the magnetic material are taken into consideration to cope with the magneto-mechanical coupling effects. Results of perturbed magnetic field and distribution of magnetostriction strain at the crack tip are obtained and being evaluated quantitatively. Finally, the effects of the applied external magnetic field on stress intensity factor of a crack in a ferromagnetic material are discussed based on the numerical results.