Simulation analysis and experimental research on stress concentration of test technique based on initial permeability
International Journal of Development Research
Simulation analysis and experimental research on stress concentration of test technique based on initial permeability
Received 24th June, 2017; Received in revised form 08th July, 2017; Accepted 29th August, 2017; Published online 30th September, 2017
Copyright ©2017, Ren Shangkun et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Initial permeability measurement is an early evaluating method of micro-structure changes such as stress concentration and fatigue damage by measuring the change of initial permeability. The detection principle of permeability testing technology for ferromagnetic material was studied and analyzed. The ANSYS finite element simulation model was established, the excitation frequency parameters were optimized, and the changing law of the detection signal with the initial permeability of ferromagnetic material was analyzed. At same time testing platform for permeability testing have been built. Then use the optimized testing platform to complete the tensile testing of 45 steel, and the relationship between detection signal and the tensile stress was studied in further. The experimental result compare to simulating result, which are approximately the same. It indicates that the permeability testing technique is a new, feasible method, which with high testing sensitivity, has a broad application prospect.
