Characterization of Stress Concentration by Tangential Component Hp(x) of Metal Magnetic Memory Signals

2018 ◽  
Vol 33 (6) ◽  
pp. 1486-1490
Author(s):  
Meili Fu ◽  
Sheng Bao ◽  
Huangjie Lou
Keyword(s):  
Stress Concentration ◽  
Tangential Component ◽  
Magnetic Memory ◽  
Metal Magnetic Memory ◽  
Memory Signals

Characterization of Stress Concentration Degree Based on 2-Dementional Magnetic Memory Signals

2012 ◽  
Vol 268-270 ◽  
pp. 396-400 ◽  
Author(s):  
Hui Peng Wang ◽  
Li Hong Dong ◽  
Shi Yun Dong ◽  
Nan Xue ◽  
Bin Shi Xu
Keyword(s):  
Stress Concentration ◽  
Fatigue Test ◽  
Tangential Component ◽  
Magnetic Memory ◽  
Memory Testing ◽  
Concentration Factors ◽  
Memory Signals ◽  
Concentration Degree ◽  
Stress Concentration Factors ◽  
Peak Value

To explore a way to characterize fatigue damage degree of ferromagnetic materials by metal magnetic memory testing (MMMT), tension-compression fatigue test of specimens with different stress concentration factors made of 45% C steel were carried out. Both normal and tangential component of magnetic memory signals, Hp(y) and Hp(x), of specimens under different fatigue cycles were measured by EMS-2003 and RM-1 magnetic memory testing apparatus respectively. The results show that, the gradient variation of Hp(y) signals during the fatigue test is similar to each other, but the gradient value is different due to the different stress concentration factors. And so is the relative peak value of Hp(x) signals. Both gradient of Hp(y) and relative peak value of Hp(x) can be used to distinguish the stress concentration degree of specimens.

Effect of tensile stress on metal magnetic memory signals during on-line measurement in ferromagnetic steel

2021 ◽  
Vol 117 ◽  
pp. 102378
Author(s):  
Huipeng Wang ◽  
Lihong Dong ◽  
Haidou Wang ◽  
Guozheng Ma ◽  
Binshi Xu ◽  
...  
Keyword(s):  
Tensile Stress ◽  
Magnetic Memory ◽  
Metal Magnetic Memory ◽  
Line Measurement ◽  
On Line ◽  
Memory Signals ◽  
Ferromagnetic Steel

Metal Magnetic Memory Testing Technique for Typical Defects in Pressure Vessels and Pipelines

2015 ◽  
Author(s):  
Weihe Guan ◽  
Pengju Guo ◽  
Chen Xuedong
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Orientation Angle ◽  
High Sensitivity ◽  
Pressure Vessels ◽  
Magnetic Memory ◽  
Metal Magnetic Memory ◽  
Time Saving ◽  
Hydrogen Induced Cracking ◽  
Memory Signals

Metal magnetic memory technique has been extensively applied in different fields due to its unique advantages of time-saving, low cost, and high efficiency. However, very limited research has been carried out on studying the characteristics of metal magnetic memory signals of different defects except crack, and also the effect of orientation angle between testing direction and defect on magnetic memory signals. To promote study in this area, the magnetic memory signals of typical defects (such as crack, slag inclusion) are investigated as well as hydrogen-induced cracking. In addition, the characteristics of magnetic memory signals when measured with different angle between testing direction and defects were obtained. The results indicate that the metal magnetic memory technique is a promising method to detect typical defects of welding and also hydrogen-induced cracking. Moreover, the technique has high sensitivity on defects no matter the angle between testing direction and defect. However, further research is needed because it can only find the possible location of defects but cannot quantitatively describe the defect.

Characterization of Fatigued Steel States with Metal Magnetic Memory Method

2018 ◽  
Vol 5 (2) ◽  
pp. 8645-8654 ◽  
Author(s):  
N. Venkatachalapathi ◽  
S.MD. Jameel basha ◽  
G. Janardhan Raju ◽  
P. Raghavulu
Keyword(s):  
Magnetic Memory ◽  
Metal Magnetic Memory ◽  
Metal Magnetic Memory Method

Eddy Current and Metal Magnetic Memory Testing Nondestructive Evaluation for Superficial Defects of Old Cylinder Barrel

2016 ◽  
Vol 850 ◽  
pp. 107-112
Author(s):  
Chang Liang Shi ◽  
Shi Yun Dong ◽  
Wei Xue Tang ◽  
Hao Zhan
Keyword(s):  
Stress Concentration ◽  
Eddy Current ◽  
Eddy Current Testing ◽  
Magnetic Memory ◽  
Memory Testing ◽  
Metal Magnetic Memory ◽  
Current Testing ◽  
Cylinder Barrel ◽  
Metal Magnetic Memory Testing

Eddy current testing and metal magnetic memory testing, cooperated with special testing devices, were applied to detect the superficial defects of old cylinder barrel. It was indicated that there were three types of the signals, which were non-defect signals, discontinuous peak signals and continuous peak signals. Non-defect signals indicated that there was no defect in cylinder barrel, and the discontinuous peak signals denoted that there was circumferential cracking, and the continuous peak signals showed that there was longitudinal cracking in the surface of cylinder barrel. The amplitude of eddy current testing signals characterizes the depth of cracking, and the gradient of magnetic signals descript the degree of stress concentration. The method mentioned above detects the cracking and stress concentration in the superficial coat of old cylinder barrel, which effectively guarantee the quality of automobile cylinder.

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