Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk


Turgut Meydan

Cardiff University (GB)

Ostatnie publikacje
1.  Wang Y., Melikhov Y., Meydan T., Yang Z., Wu D., Wu B., He C., Liu X., Stress-dependent magnetic flux leakage: finite element modelling simulations versus experiments, JOURNAL OF NONDESTRUCTIVE EVALUATION, ISSN: 0195-9298, DOI: 10.1007/s10921-019-0643-0, Vol.39, pp.1-1-9, 2020

Assessing the effect of defect induced stresses on magnetic flux leakage (MFL) signals is a complicated task due to nonlinear magnetomechanical coupling. To facilitate the analysis, a multi-physics finite elemental simulation model is proposed based on magnetomechanical theory. The model works by quasi-statically computing the stress distribution in the specimen, which is then inherited to solve the nonlinear magnetic problem dynamically. The converged solution allows identification and extraction of the MFL signal induced by the defect along the sensor scanning line. Experiments are conducted on an AISI 1045 steel specimen, i.e. a dog-bone shaped rod with a cylindrical square-notch defect. The experiments confirm the validity of the proposed model that predicted a linear dependency of the peak-to-peak amplitude of the normalized MFL signal on applied stress. Besides identifying the effect of stress on the induced MFL signal, the proposed model is also suitable for solving the inverse problem of sizing the defects when stress is involved.

Słowa kluczowe:
magnetic flux leakage, magnetomechanics, Jiles–Atherton model, non-destructive testing, finite element method, multiphysics numerical simulation

Afiliacje autorów:
Wang Y. - Beijing Aeronautical Manufacturing Technology Research Institute (CN)
Melikhov Y. - inna afiliacja
Meydan T. - Cardiff University (GB)
Yang Z. - inna afiliacja
Wu D. - inna afiliacja
Wu B. - inna afiliacja
He C. - inna afiliacja
Liu X. - inna afiliacja
2.  Hussain M., Misbah-ul-Islam , Meydan T., Cuenca J.A., Melikhov Y., Mustafa G., Murtaza G., Jamil Y., Microwave absorption properties of CoGd substituted ZnFe2O4 ferrites synthesized by co-precipitation technique, CERAMICS INTERNATIONAL, ISSN: 0272-8842, DOI: 10.1016/j.ceramint.2017.12.145, Vol.44, No.6, pp.5909-5914, 2018

A series of co-precipitated Zn1-xCoxGdyFe2-yO4 spinel ferrites (x = 0.0-0.5, y = 0.00-0.10) sintered at 1000 degrees C were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), vibrating sample magnetometery (VSM) and microwave cavity perturbation (MCP). XRD patterns and FTIR spectra reveal formation of the spinel phase along with few traces of GdFeO3 second phase. The lattice constant decreases with an increasing amount of CoGd ions due to the segregation of Gd3+ on the grain boundaries and due to replacement of lager Zn2+ ions with smaller Co2+ ions. SEM shows grain size to decrease with the increase of CoGd contents due to grain growth inhibition by the second phase. VSM results show remanence and saturation magnetization to exhibit an increasing trend due to Co substitution on octahedral sites and presence of a second phase. The coercivity increases with the increase of CoGd contents due to anisotropic nature of Co. MCP shows the complex magnetic permeability to increase with CoGd concentration while the complex permittivity decreases.

Słowa kluczowe:
Spinel ferrites, Magnetization, Permittivity, Permeability

Afiliacje autorów:
Hussain M. - Bahauddin Zakariya University (PK)
Misbah-ul-Islam  - Bahauddin Zakariya University (PK)
Meydan T. - Cardiff University (GB)
Cuenca J.A. - Cardiff University (GB)
Melikhov Y. - IPPT PAN
Mustafa G. - Bahauddin Zakariya University (PK)
Murtaza G. - Bahauddin Zakariya University (PK)
Jamil Y. - University of Agriculture (PK)

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