Simulation Optimization And Experimental Study Of Nondestructive Testing Technology Based On Inverse Magnetostrictive Effect

Ferromagnetic materials are widely used in the current society,and their performance has a great impact on the safety of equipment and engineering,etc.The magnetic nondestructive testing technology of ferromagnetic materials can effectively detect the stress,defect,fatigue and other problems of materials,which is an important guarantee for the safe operation of equipment and engineering.It is of great significance to study the testing mechanism,mechanical and magnetic coupling model and the influencing factors in the testing process of magnetic nondestructive testing technology to improve the testing accuracy of magnetic nondestructive testing technology and to accurately judge the remaining service life of materials.According to different factors under the influence of the magnetic domain movement process of the macro magnetization process and materials,this paper consider the external magnetic field and the stress,the defects of the common influence factors on material such as magnetic behavior,from the perspective of energy conservation,material is established in the magnetization model under the influence of many factors,according to the motion law of the magnetic domain and material macro magnetization curve trend,material force magnetic coupling equation can be obtained,extension method of magnetic nondestructive testing technology of macroscopic piezomagnetic theory.Matlab is used to simulate the coupling model and solving equation,and the simulation results show the accuracy of the magnetic coupling model.According to material of the internal energy conversion process,the strength of the magnetic coupling equation is derived on the basis of the stress and the relative magnetic permeability of magnetic-mechanical model,according to the calibration experiment and actual testing process of the stress tests for detecting the geometry structure of 3 d modeling,the variable relationship model and geometry model import COMSOL Multiphysics software more physical field coupling simulation,get in under the influence of many factors such as stress,defects,coating the induced electromagnetic field distribution,determine appropriate probe structure and improve the testing process.The simulation results show that the stress detection process is affected by many factors.Based on the simulation of the probe structure and the multi-physical field coupling simulation,the specific geometry size of the corresponding probe structure and the simulation optimization of the coil winding mode were carried out,and the optimized probe structure was used for the calibration experiment of stress detection to clarify the detection process and explore the influencing factors of the material sensitivity coefficient.According to the simulation results and theoretical analysis,the influence factors existed in the stress detection were experimentally explored.Single factor control method and comparative analysis method were used to study the influence of different influencing factors such as temperature,particle size of sintered material,coating and pretreatment behavior on the magnetic behavior of materials.The experimental results show that there are many influencing factors in the process of stress detection,all of which have different degrees of influence on the distribution of induced magnetic field,magnetic behavior of materials and sensitivity coefficient in the detection.