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Evaluating of Microstructure Damage and Strain for Ferromagnetic Specimens Based on Sensitive Differential Susceptibility
Received date: 2013-07-08
Revised date: 2013-09-29
Online published: 2013-11-01
In order to early and accurately test and evaluate the stress concentration situation and fatigue damage degree of ferromagnetic component, the sensitive differential magnetic permeability testing technique is to be theoretical analysis and experimental search. The basic principle and basic characteristics of the sensitive differential permeability detection technology are studied, and test platform has been successfully fabricated. Some experiments of measuring sensitive differential magnetic permeability are performed for carbon steel specimens. At the same time, further confirmation is realized by measuring initially magnetizing curve for carbon steel materials. Theory analysis testifies that the test signal is proportional to differential magnetic permeability. It shows that for 20 steel, 35 steel and 235 steel, the sensitive differential permeability is the initial differential magnetic permeability, which is verified by low field initial magnetization curve. For 20 steel, when the stress reaches the rupture strength, sensitive differential permeability is up to 30%. For 45 steel, when the stress is near the rupture strength, sensitive differential permeability is up to 35%. Experiments show that the sensitive differential permeability testing technology is a new high-precision testing method,and has broad application prospect.
REN Shangkun , XU Zhenhan . Evaluating of Microstructure Damage and Strain for Ferromagnetic Specimens Based on Sensitive Differential Susceptibility[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2014 , 35(5) : 1452 -1458 . DOI: 10.7527/S1000-6893.2013.0446
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