New extensometers using amorphous magnetostrictive ribbon wound cores

Abstract. Paper presents the frame-shaped cores based methodology of testing of magnetoelastic characteristics of energetic steels such as X30Cr13 steel, subjected to tensile stresses. In presented method, the magnetic circuit of the sample is closed. For this reason, the results of magnetoelastic investigation are independent of the shape of the sample. To validate the proposed method, the influence of tensile stresses on B(H) hysteresis loop of X30Cr13 martensitic corrosion resistant steel was carried out. On the base of these result, clear criteria for non-destructive assessment of mechanical stresses in the material were determined.Keywords: magnetoelastic effect, corrosion resistant steel, stress assessment. IntroductionUnder the influence of mechanical stresses, the shape of B(H) magnetic hysteresis loop changes significantly for both crystalline [1] and amorphous [2] magnetic materials. This effect is commonly known as magnetoelastic effect [3,16]. In spite of the fact that changes of flux density B under stresses are most significant for high permeability amorphous and nanocrystalline alloys [4,5,6], the magnetoelastic effect is also observed in steels [7,8,9]. As a result, measurements of stress-induced changes of shape of hysteresis loop of steel, creates the possibility of non-destructive assessment of mechanical stresses generated during the use mechanical component. Magnetoelastic-effect based non-destructive testing of corrosion resisting steels can be considered only for the martensitic steels, such as X30Cr13 steel. Austenitic steels are non-magnetic, however, under specified mechanical stresses austenite may be conversed to martensite [10,11,12]. This phenomenon is also very interesting from the non-destructive testing point of view, but its principle is different than magnetoelastic effect in martensitic steels.Martensitic corrosion resisting X30Cr13 steel exhibits good resistance to the corrosive effect of salt water, weather and various corrosion agents. Moreover, this steel

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“…In the worst case, when both tensile and compressive stresses appear [13], stress sensitivity of the sample may be misleading.…”

Section: Methodology Of Measurementsmentioning

confidence: 99%

Influence of Stresses on Magnetic B-H Characteristics of X30Cr13 Corrosion Resisting Martensitic Steel

Jackiewicz

Szewczyk

Salach

et al. 2014

Recent Advances in Automation, Robotics and Measuring Techniques

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“…When distribution of stresses is non-uniform, such as in the case of ringshaped magnetoelastic sensors developed by Mohri [9], results of investigation are diffi cult for interpretation from physical point of view. Moreover range of possible stresses is limited to the stress strength of the most stressed area of the core,…”

Section: Methods Of Investigationmentioning

confidence: 99%

Analysis and Computer Modeling of Magnetoelastic Characteristics of FeNi-based Amorphous Ring-shaped Core under Uniform Compressive and Tensile Stresses

Salach¹,

Szewczyk²,

Bieńkowski³

et al. 2013

Theoretical and Applied Informatics

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Paper presents methodology of generation of the uniform, compressive or tensile stresses in ring-shaped amorphous alloys core. In this study we use the set of special nonmagnetic, cylindrical backings. These backings enabled the core to be wound as well as create the possibility of generation of uniform compressive and tensile stresses. Using presented methodology the magnetoelastic characteristics were experimentally determined for Fe 40 Ni 38 Mo 4 B 18 Metglas 2826 MB amorphous alloy. Knowledge about these properties is important for users of inductive components with amorphous alloys cores due to the fact, that changes of fl ux density due to magnetoelastic effect exceed 40%.

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“…Moreover sensitivity of the sensing element was also limited due to the fact that tensile and compressive stresses in the core generated opposite magnetoelastic effects. In addition physical interpretation of the results of magnetoelastic tests is very sophisticated in a case of non-uniform distribution of compressive stresses in the sample [5].…”

Section: Methods Of Investigationmentioning

confidence: 99%

The influence of thermal treatment on the properties of Co‐based magnetoelastic sensing elements

Szewczyk

Bieńkowski

Kolano

2004

phys. stat. sol. (c)

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PACS 75.50. Kj, 75.80.+q, 81.40.Vw Cobalt-based amorphous alloys (such us Co 68 Fe 4 B 13 Si 13.5 Mo 1.5 ) may be utilized in cores of magnetoelastic stress and force sensors. To achieve the proper functional parameters of core's material, the proper heat treatment should be applied. Paper presents results of the magnetoelastic investigation carried out on two ring samples. First sample was as quenched and second sample was annealed at temperature of 360 oC for 1 hour. The compressive stress was applied to the ring core perpendicularly to the flux density direction. The changes of the magnetic properties of both samples, as a function of compressive stresses, are presented. High stress sensitivity of both samples was observed in spite of a low magnetostriction of Co 68 Fe 4 B 13 Si 13.5 Mo 1.5 amorphous alloy.

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New extensometers using amorphous magnetostrictive ribbon wound cores

Cited by 27 publications

References 3 publications

Influence of Stresses on Magnetic B-H Characteristics of X30Cr13 Corrosion Resisting Martensitic Steel

Influence of Stresses on Magnetic B-H Characteristics of X30Cr13 Corrosion Resisting Martensitic Steel

Analysis and Computer Modeling of Magnetoelastic Characteristics of FeNi-based Amorphous Ring-shaped Core under Uniform Compressive and Tensile Stresses

The influence of thermal treatment on the properties of Co‐based magnetoelastic sensing elements

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