An approach to dry friction and wear for small volumes

Tymiak, N. I.; Kramer, Donald E.; Daugela, Antanas; Jungk, J. M.; Li, Min

doi:10.1080/01418610208240446

Cited by 13 publications

(10 citation statements)

References 18 publications

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“…Results also parallel previous work showing that the amount of strain in the near surface region increases with the number of sliding contact passes. [10,28] …”

Section: Roughness Correctionsmentioning

confidence: 98%

Probing the Strain Hardening Response of Small Wear Volumes with Nanoindentation

Cordill

Moody

Jungk

et al. 2011

Metall Mater Trans A

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In order to characterize the wear and related mechanical behavior of materials from small volumes, a program employing nanoscratch and nanoindentation was performed. Nanoscratch techniques were used to generate square wear patterns with varying degrees of shear strain followed by nanoindentation tests to measure the mechanical properties within the deformation area. Results show a systematic increase in hardness with both the applied load and number of nanoscratch passes. An analytical approach was used to determine the stress-strain response and strain hardening behavior of electroformed nickel. The strain hardening exponent determined from this method follows the work hardening behavior established from previous tensile tests, supporting the use of a nanomechanics-based approach for evaluating the mechanical properties of wear-tested material.

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“…Results also parallel previous work showing that the amount of strain in the near surface region increases with the number of sliding contact passes. [10,28] …”

Section: Roughness Correctionsmentioning

confidence: 98%

Probing the Strain Hardening Response of Small Wear Volumes with Nanoindentation

Cordill

Moody

Jungk

et al. 2011

Metall Mater Trans A

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“…From experimental observations of dislocation rosette patterns, we know that dislocations extend well beyond the continuum estimate. For example, from AFM profiles, we know the rosette pattern extended well beyond the pile-up region observed at the surface, measured to be 500 nm and >3000 nm, respectively [10]. In addition, we now know that dislocations are emitted under the tip prior to the displacement excursion and that these are released commensurate with the yield excursion.…”

Section: Length Scale(s) For Bulk Deformationmentioning

confidence: 99%

“…An example of a yield excursion and the corresponding pile-ups in a <100>Ta single crystal is shown in Figure 2. In a recent paper [10], the continuum representation of pile-up [11] was found to give a good fit to plastic pile-up as determined by AFM measurement. For the contact radius, a being much smaller than the plastic zone size radius, c, plastic pile-up, h p at the contact edge is given by…”

Section: Length Scale(s) For Bulk Deformationmentioning

confidence: 99%

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Length scales for the fracture of nanostructures

Jungk

Volinsky

et al. 2003

International Journal of Fracture

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Length scales are essential to the understanding of small volume deformation and fracture in emerging technologies. Recent analysis by two groups at the atomistic [1] and mesoscopic [2] levels have shown the importance of the volume to surface ratio to the indentation size effect (ISE) at small depths of penetration. We have interpreted this in terms of the plastic work under the contact and the surface work associated with the creation of new surface or the excess surface stress. Treating this as a modified Griffith criterion the case is made that this same length scale should apply to the delamination of thin films. By making this simple equivalency in length scales, an R-curve analysis for crack growth resistance, G R , in thin film delamination emerges. This recovers the classic E h ys 2 σ term as well as the fact that interfacial toughness should scale with the square root of incremental crack growth. Here σ ys is yield strength, h is thickness and E is modulus of the film. As applied to thin Cu films bonded to silicon substrates with a thin innerlayer of Ti, the model is in good agreement.

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“…This can be roughly compared to the high speed phenomena (<0.1 ls) such as plasticity yield point, materials phase transformation, and crystalographic orientation induced changes carried out by AE monitored nanoindentation process at the nanometer scale (Daugela et al 2001;Gerberich et al 2002;Tymiak et al 2003). In these experiments AE events were monitored at quasistatic loads of <100 lN.…”

Section: Physics Of Weak Hdi Interactionsmentioning

confidence: 99%

Ultra sensitive in-situ acoustic characterization system for HDD head disc interface defectoscopy

2006

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An ultra sensitive drive level acoustic characterization system has been developed for in-situ Head Disc Interface defectoscopy. Multimode acoustic emission (AE) sensor installed on the drive cover is designed for tracking air bearing (AB) and slider modes. Monitored modal changes at the AB and slider bandwidth correlate to the weak head disc interface (HDI) interactions such as lubricant modulation and particles induced defects. Two or three orders of magnitude increase in sensitivity can be achieved by a combination of advanced sensors, data acquisition hardware and digital signal processing algorithms. Continuous and Discrete Wavelet Transform and Joint Time-Frequency analyses are implemented for the AB modal data mining process. Performance of the newly developed technology is demonstrated on a normally operating hard disc drive (HDD).

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An approach to dry friction and wear for small volumes

Cited by 13 publications

References 18 publications

Probing the Strain Hardening Response of Small Wear Volumes with Nanoindentation

Probing the Strain Hardening Response of Small Wear Volumes with Nanoindentation

Length scales for the fracture of nanostructures

Ultra sensitive in-situ acoustic characterization system for HDD head disc interface defectoscopy

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