New magnetoelastic force sensor using amorphous alloys

Seekircher, J.; Hoffmann, Bernd

doi:10.1016/0924-4247(89)80002-0

Cited by 29 publications

(9 citation statements)

References 5 publications

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“…Although previous attempts have been made at designing implantable monitoring systems [5]- [8], many are only usable during the surgical process or require modifications to the existing implant architecture [9]. In this paper, amorphous magnetostrictive ribbons were integrated into UHMWPE as [14]. They are usually manufactured as a ribbon or wire by melt-spinning and rapid quenching techniques to form non-crystalline alloys of iron, cobalt or nickel, and metalloids (mostly boron and silicon).…”

Section: Introductionmentioning

confidence: 99%

Non-Invasive Measurement of Stress Levels in Knee Implants Using a Magnetic-Based Detection Method

2016

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A knee replacement surgery (arthroplasty) has become prevalent worldwide and has a high success rate over the short to medium term. In some cases, especially over the longer term, implant degradation can develop due to the deterioration of the ultra-high molecular weight polyethylene (UHMWPE) tibial insert. Unfortunately, there are no satisfactory techniques currently available for assessing implant integrity and predicting failure. This paper describes a possible solution to this problem by using a non-invasive, electromagnetic method for monitoring implant integrity. This approach utilizes the magnetoelastic property of amorphous ribbon, which when stressed causes an inductance change in a nearby magnetizing winding. Amorphous ribbons encased in UHMWPE disks, to simulate a knee insert, were subjected to varying tensile stresses under an applied ac magnetic field. A correlation between total circuit impedance and applied stress was observed. The results obtained demonstrate that the proposed sensor has sufficient sensitivity for measuring typical stress levels associated with the axial forces in tibial inserts.

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Section: Introductionmentioning

confidence: 99%

Non-Invasive Measurement of Stress Levels in Knee Implants Using a Magnetic-Based Detection Method

2016

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“…To this end, it is necessary to consider first the deformations that a magnetostrictive material undergoes when its domain configuration changes. Several models exist for quantifying these deformations, including phenomenological formulations [16], a quadratic law for domain magnetization rotation [4], energy or thermodynamic formulations [23][24][25], elastomagnetic models [26][27][28][29][30], micromagnetic theories [14] and magnetization rotation analysis [3]. At low to moderate operating levels, or when material stresses are invariant, these deformations dominate over other material elastic dynamics.…”

Section: Magnetostrictionmentioning

confidence: 99%

“…Existing and potential applications for magnetostrictive sensors are numerous because the newer magnetostrictive materials, fabricated both in crystalline and amorphous form, can exhibit comparatively large coupling coefficients in the conversion of energy between the magnetic and elastic states. Recognizing that the magnetostrictive response can be described mathematically through invertible tensor relations, the conversion between elastic and magnetic energy is: (i) reciprocal and (ii) of linear or torsional nature depending on whether the magnetic field is longitudinal (x ii directions) or circumferential (x ij directions) [12,13,25,26]. Linear and torsional sensing mechanisms are thus possible with magnetostrictive materials.…”

Section: Introductionmentioning

confidence: 99%

A Magnetoelastic Model for Villari-Effect Magnetostrictive Sensors

Dapino¹,

Smith²,

Calkins³

et al. 2002

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A magnetomechanical model for the design and control of Villari-effect magnetostrictive sensors is presented. The model quantifies the magnetization changes that a magnetostrictive material undergoes when subjected to a dc excitation field and variable stresses. The magnetic behavior is characterized by considering the Jiles-Atherton mean field theory for ferromagnetic hysteresis, which is constructed from a thermodynamic balance between the energy available for magnetic moment rotation and the energy lost as domain walls attach to and detach from pinning sites. The effect of stress on magnetization is quantified through a law of approach to the anhysteretic magnetization. Elastic properties of the sensor are incorporated by means of a wave equation that quantifies the strains and stresses arising in response to moment rotations. This yields a nonlinear PDE system for the strains, stresses and magnetization state of a magnetostrictive transducer as it drives or is driven by external loads. Because the model addresses the magnetoelastic coupling, it is applicable to both magnetostrictive sensors and actuators. Properties of the model and approximation method are illustrated by comparison with experimental data collected from a Terfenol-D sensor. 1 Report Documentation PageForm Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.

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“…In recent applications external force was applied along the direction of the diameter of a ring core [1,6], or in the case of ferrites, compressive stress was applied to the frame samples [7]. Also tensile stresses were applied to strips of amorphous alloy [2][3][4].…”

mentioning

confidence: 99%

New Possibility of Utilizing Amorphous Ring Cores as Stress Sensor

Bieńkowski¹,

Szewczyk

2002

phys. stat. sol. (a)

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This paper presents a new method of applying stresses to an amorphous ring core. Due to the special cylindrical backings, compressive stress is applied perpendicular to the direction of flux density. In this method the distribution of stresses in the core is uniform and known. This method was used to investigate magnetoelastic properties of a ring core made of Fe 40 Ni 38 Mo 4 B 18 amorphous alloy. The changes of quasi-static hysteresis loops, flux density and permeability for compressive stresses up to 10 MPa are presented. Permeability at H m = 1.5H c decreases over 40% for stresses up to 10 MPa. These experimental results confirm that the presented method may be very useful in the construction of stress transducers.

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New magnetoelastic force sensor using amorphous alloys

Cited by 29 publications

References 5 publications

Non-Invasive Measurement of Stress Levels in Knee Implants Using a Magnetic-Based Detection Method

Non-Invasive Measurement of Stress Levels in Knee Implants Using a Magnetic-Based Detection Method

A Magnetoelastic Model for Villari-Effect Magnetostrictive Sensors

New Possibility of Utilizing Amorphous Ring Cores as Stress Sensor

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