Fatigue Degradation Properties of LIGA Ni Films Using Kilohertz Microresonators

Baumert, E. K.; Pierron, Olivier N.

doi:10.1109/jmems.2012.2212422

Cited by 26 publications

(32 citation statements)

References 33 publications

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“…The mechanical monotonic tensile properties have been previously measured using microtensile tests of dog bone shaped specimens [33]: the 0.2% yield stress is ∼650±70…”

Section: Microresonator Experimental Setup: Measurement Of Fatigue Crack Initiation Lifementioning

confidence: 99%

A computational and experimental comparison on the nucleation of fatigue cracks in statistical volume elements

Kakandar

Barrios

Michler

et al. 2020

International Journal of Fatigue

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“…The mechanical monotonic tensile properties have been previously measured using microtensile tests of dog bone shaped specimens [33]: the 0.2% yield stress is ∼650±70…”

Section: Microresonator Experimental Setup: Measurement Of Fatigue Crack Initiation Lifementioning

confidence: 99%

A computational and experimental comparison on the nucleation of fatigue cracks in statistical volume elements

Kakandar

Barrios

Michler

et al. 2020

International Journal of Fatigue

Self Cite

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“…Fig. 9(b) denotes clear ridge shapes with height of 555.1 nm originated from the stretching strain in FeCo thin-film after multi-testing, and this leads to fall off and cracks of the thin-film [24], [25]. The Cr thin-film has altered thing somewhat.…”

Section: Fatigue Analysis Of Feco Thin-film Coated Devicesmentioning

confidence: 99%

Fatigue Characteristics of Magnetostrictive Thin-Film Coated Surface Acoustic Wave Devices for Sensing Magnetic Field

et al. 2020

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Magnetostrictive thin-film coated Surface Acoustic Wave (SAW) devices were promising for sensing magnetic field owing to their superior features as micro-size, fast response, and high sensitivity originated from the magnetostrictive effect. However, the magnetostriction nature in magnetostrictive thinfilm causes significantly mechanical fatigue in service, deteriorating the sensor performances. In this work, the fatigue phenomenon in magnetostrictive coating was underlined by characterizing the prepared FeCo thin-film coated magnetic device cyclically. Obvious shedding was observed in FeCo coating after cyclic testing and the magnetic-sensitivity decreases significantly. One of the reasons is the weak adhesion of FeCo thin-film towards the substrate. As an available way allowing enhancement of adhesion, a Cr thinfilm was employed as the transition-layer to weaken the mechanical fatigue. However, it accompanied by the issue of the reduced magnetostrictive coefficient and the obstruction in magnetostrain-tranfer to piezoelectric substrate. As a result, the slump in sensitivity was observed. To address such issues, a design of dotted-pattern with Cr transition layer was employed to build the SAW based magnetic-device. High magnetic-sensitivity and excellent long-term stability were achieved because of the release of coercive force in FeCo dots and enhancement of the FeCo adhesion to the substrate.INDEX TERMS Dotted-pattern, mechanical fatigue, magnetostrictive effect, SAW magnetic sensor, Cr transition layer.

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“…We consider the micro-resonator technique developed by Pierron and co-workers [17] , which applies cyclic loading to a cantilever micro-beam under fully reversed loading (Fig. 1).…”

Section: Micro-beam Fatigue Damagementioning

confidence: 99%

Computational and experimental study of crack initiation in statistical volume elements

et al. 2019

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Fatigue crack formation and early growth is significantly influenced by microstructural attributes such as grain size and morphology. Although the crystallographic orientation is a primary indicator for fatigue cracking, the neighbourhood conformed by the first and second neighbour grains strongly affect the fatigue cracking driving force. Hence, two identical grains may result in different fatigue responses due to their interactions with their microstructural ensemble, which determines the fatigue variability. Naturally, macroscopic samples with millions of grains and thousands of competing microstructural neighbourhoods can effectively resemble a representative volume element in which fatigue failure may seem deterministic. However, when considering systems in which fatigue failure is controlled by hundreds or less of grains, fatigue failure is stochastic in nature and the samples are not a representative but a statistical volume. This work studies fatigue crack nucleation in micron-scale Ni beams that contain a few hundred grains. This work presents 3D crystal plasticity finite element models to compute stochastic distribution of fatigue indicator parameters that serve as proxies for crack nucleation in statistical volume elements. The integration of experiments with models provides a method to understand the irreversible deformation at the grain level that leads to fatigue cracking. Our results explain the role of grain morphology of crack nucleation distribution

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Fatigue Degradation Properties of LIGA Ni Films Using Kilohertz Microresonators

Cited by 26 publications

References 33 publications

A computational and experimental comparison on the nucleation of fatigue cracks in statistical volume elements

A computational and experimental comparison on the nucleation of fatigue cracks in statistical volume elements

Fatigue Characteristics of Magnetostrictive Thin-Film Coated Surface Acoustic Wave Devices for Sensing Magnetic Field

Computational and experimental study of crack initiation in statistical volume elements

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