Characterization of Crack Initiation Life in Ferromagnetic Material by Metal Magnetic Memory Testing

Chang Liang Shi; Wei Xue Tang; Hao Zhan; Shi Yun Dong

doi:10.4028/www.scientific.net/MSF.817.791

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HomeMaterials Science ForumMaterials Science Forum Vol. 817Characterization of Crack Initiation Life in...

Characterization of Crack Initiation Life in Ferromagnetic Material by Metal Magnetic Memory Testing

Abstract:

In the geomagnetic field, stress can induce spontaneous magnetic signals in ferromagnetic materials, the method, named metal magnetic memory testing, can be potentially applied in estimating the fatigue life. In this paper, the normal component of magnetic field, Hp (y), was measured during dynamic tension test on the surfaces of ferromagnetic specimens with stress concentration factor of 5. The results indicated that the gradient of magnetic field intensity, K, was the key parameter to characterize crack initiation life. Then the numerical fitting of K and fatigue cycles were done under three level loads, 568.7MPa, 698.8MPa and 864.4MPa, meanwhile, a simple model was derived.

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Materials Science Forum (Volume 817)

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791-796

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https://doi.org/10.4028/www.scientific.net/MSF.817.791

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April 2015

Authors:

Chang Liang Shi, Wei Xue Tang, Hao Zhan, Shi Yun Dong

Keywords:

Crack Initiation Life, Magnetic Field Intensity, Metal Magnetic Memory, Prediction Model

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