Correlation between Crack Growth Rate and Magnetic Memory Signal of X45 Steel

2007 ◽  
Vol 353-358 ◽  
pp. 2293-2296 ◽  
Author(s):  
Hai Yan Xing ◽  
Ri Xin Wang ◽  
Min Qiang Xu ◽  
Jia Zhong Zhang
Keyword(s):  
Growth Rate ◽  
Crack Growth Rate ◽  
Crack Growth ◽  
Fatigue Testing ◽  
Magnetic Memory ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Three Point Bending ◽  
Growth Evaluation ◽  
Non Destructive

Crack growth rate, as an important parameter, is widely applied in crack growth evaluation and fatigue life prediction. The objective of this paper is to study crack growth rate with the metal magnetic memory (MMM) technology which is a non-destructive testing method newly developed. The correlation between crack growth rate da / dN and magnetic memory signal Hp(y) is investigated through three-point bending fatigue testing. Samples of steel X45, with different heat treatments, quenching and thermal refining, are tested in HYG fatigue machinery. The correlation curves of da / dN ~ Hp(y) are built and the characteristics of magnetic memory signal are given. The influence of heat treatment on Hp(y) is also analyzed. The crack growth rate model of X45 based on MMM signal is presented and verified.

Detection of Crack Growth Rate in 45 Steel by Metal Magnetic Memory

2010 ◽  
Vol 34-35 ◽  
pp. 855-858
Author(s):  
Da Bo Wu ◽  
Min Qiang Xu ◽  
Hai Yan Xing
Keyword(s):  
Heat Treatment ◽  
Growth Rate ◽  
Crack Growth Rate ◽  
Crack Growth ◽  
Fatigue Testing ◽  
Normal Component ◽  
Testing Machine ◽  
Fatigue Tests ◽  
Magnetic Memory ◽  
Metal Magnetic Memory

It is important that monitoring the fatigue crack propagation in engineering. This paper studied crack growth rate with the metal magnetic memory technique. Three-point bending fatigue tests of center-cracked specimens were carried out and the normal component of magnetic field signals Hp(y) on the surface of specimens were measure by TSC-1M-4. The correlation of crack growth rate da/dN and metal magnetic memory normal signal Hp(y) was studied. The specimens, with different heat treatment, quenching and thermal refining, were tested in fatigue-testing Machine to study the influence of heat treatment on the metal magnetic memory signal Hp(y). The curve of da/dN ~ Hp(y) was built.

scholarly journals Continuous Estimation of the Crack Growth Rate during Rotating‒Bending Fatigue Testing

Metals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 275 ◽  
Author(s):  
Gabriela Martinez-Cazares ◽  
Rafael Mercado-Solis ◽  
Yaneth Bedolla-Gil ◽  
Diego Lozano
Keyword(s):  
Growth Rate ◽  
Crack Growth Rate ◽  
Crack Growth ◽  
Fatigue Testing ◽  
Crack Nucleation ◽  
Bending Fatigue ◽  
Initial Load ◽  
Rotating Bending Fatigue ◽  
Rotating Bending ◽  
Continuous Estimation

A method for estimating the crack growth rate in steel during rotating‒bending fatigue testing is presented. Constant deflection tests were conducted in which the initial load remained constant prior to crack nucleation, when it decreased as the crack grew. In the proposed approach, steel samples were sharp-notched to produce a characteristic circular fracture upon loading and the final fracture area was correlated with a ratio of the load prior to fracture and the initial load. In this method, the deflection imposed is a function of a material’s elastic modulus rather than its yield strength and the correlation obtained to estimate the average crack length as a function of the instantaneous load is independent of the applied stress or steel grade.

A Review of the Metal Magnetic Memory Technique

2016 ◽  
Author(s):  
Sheng Bao ◽  
Meili Fu ◽  
Shengnan Hu ◽  
Yibin Gu ◽  
Huangjie Lou
Keyword(s):  
Experimental Investigations ◽  
Magnetic Memory ◽  
Metal Magnetic Memory ◽  
Non Destructive Testing ◽  
Early Failure ◽  
Destructive Testing ◽  
Damage State ◽  
Recent Developments ◽  
As Stress ◽  
Non Destructive

Metal magnetic memory (MMM) is a newly developed non-destructive testing (NDT) technique. It has potentials to detect early failure, such as stress concentration, micro-crack and fatigue damage of ferromagnetic components. This paper outlines the recent developments of the mechanism studies on the MMM technique. Several advances in experimental investigations on the MMM technique are also summarized, e.g. the factors which can influence the detection signals, the criteria for judging the damage state and the magnetic parameters which can be used to assess the testing results. Finally, some future development trends about this technique are suggested.

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