Use of nanoindentation to measure residual stresses in surface layers

Dean, James; Aldrich-Smith, G.; Clyne, T.W.

doi:10.1016/j.actamat.2011.01.014

Cited by 59 publications

(19 citation statements)

References 9 publications

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“…It was confirmed that UNSM treatment resulted in grain refinement, the formation of an amorphous solid, increased dislocation density, and high hardness. To understand how these microstructural properties affect the residual stress, the residual stresses were determined using a nanoindentation technique [36,37]. Figure 9 shows the effect of the static load in UNSM treatment on the representative load-displacement curves of Alloy 600 using Nano-indentation.…”

Section: Resultsmentioning

confidence: 99%

The Effect of the Static Load in the UNSM Process on the Corrosion Properties of Alloy 600

Kim

2019

Materials

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To suppress stress corrosion-cracking, compressive residual stresses, such as shot peening, laser peening, water jet peening, ultrasonic peening, and ultrasonic nanocrystal surface modification (UNSM) are utilized. However, among the numerous techniques, there is little research about the corrosion effect of detailed conditions, such as static load or amplitude in UNSM. A study on UNSM among various techniques of adding compressive residual stress to Alloy 600 was conducted. The focus of this study was on the effect of the static load in UNSM on the corrosion properties of Alloy 600. Microstructure analysis was conducted using an optical microscope (OM), a scanning electron microscope (SEM), and electron backscattering diffraction (EBSD), while compressive residual stress was measured using a nano-indentation technique. A cyclic polarization test and the AC (Alternating Current)-impedance measurement were both used to analyze the corrosion properties. An increase in static load under critical static load enhanced the grain boundary diffusion, consequently strengthened the passive film, and facilitated the surface diffusion, thereby improving the passivation of Alloy 600. However, higher static loads over the critical value can lead to an increase in the friction between the striking tip and the surface, thereby creating an overlapped wave, which reduces the corrosion properties.

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Section: Resultsmentioning

confidence: 99%

The Effect of the Static Load in the UNSM Process on the Corrosion Properties of Alloy 600

Kim

2019

Materials

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“…However, the stresses can be reduced by incorporating other atoms into the structure (i.e., Si, O, N, F [18][19][20] or metals [21,22]). It is worth mentioning that the reduction in stresses is often associated with a reduction in hardness and elastic modulus of the layers [6,23].…”

Section: Introductionmentioning

confidence: 99%

Physicochemical and Biological Activity Analysis of Low-Density Polyethylene Substrate Modified by Multi-Layer Coatings Based on DLC Structures, Obtained Using RF CVD Method

et al. 2018

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In this paper, the surface properties and selected mechanical and biological properties of various multi-layer systems based on diamond-like carbon structure deposited on low-density polyethylene (LDPE) substrate were studied. Plasma etching and layers deposition (incl. DLC, N-DLC, Si-DLC) were carried out using the RF CVD (radio frequency chemical vapor deposition) method. In particular, polyethylene with deposited N-DLC and DLC layers in one process was characterized by a surface hardness ca. seven times (up to ca. 2.3 GPa) higher than the unmodified substrate. Additionally, its surface roughness was determined to be almost two times higher than the respective plasma-untreated polymer. It is noteworthy that plasma-modified LDPE showed no significant cytotoxicity in vitro. Thus, based on the current research results, it is concluded that a multilayer system (based on DLC coatings) obtained using plasma treatment of the LDPE surface can be proposed as a prospective solution for improving mechanical properties while maintaining biocompatibility.

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“…Dean et al [16] found that the peak indentation load is fairly sensitive to the presence of residual stress and they used nanoindentation to measure residual stresses in surface layers. They pointed out that this technique is well suited for the mapping of residual stresses over the surface of a component because nanoindentation involves investigation of relatively small volumes of material.…”

Section: Introductionmentioning

confidence: 99%

Determination of residual stresses and material properties by an energy-based method using artificial neural networks

Jin¹,

Yang²,

Yan³

2012

Proc. Estonian Acad. Sci.

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With the help of an energy-based method and dimensional analysis, an artificial neural network model is constructed to extract the residual stress and material properties using spherical indentation. The relationships between the work of residual stress, the residual stress, and material properties are numerically calibrated through training and validation of the artificial neural network (ANN) model. They enable the direct mapping of the characteristics of the indentation parameters to the equi-biaxial uniform residual stress and the elastic-plastic material properties. The proposed ANN can quickly and effectively predict the residual stress and material properties based on the load-depth curve of spherical indentation.

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Use of nanoindentation to measure residual stresses in surface layers

Cited by 59 publications

References 9 publications

The Effect of the Static Load in the UNSM Process on the Corrosion Properties of Alloy 600

The Effect of the Static Load in the UNSM Process on the Corrosion Properties of Alloy 600

Physicochemical and Biological Activity Analysis of Low-Density Polyethylene Substrate Modified by Multi-Layer Coatings Based on DLC Structures, Obtained Using RF CVD Method

Determination of residual stresses and material properties by an energy-based method using artificial neural networks

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