Characterization of optical, electronic and topographic images in fatigue research

Savary, Gilles; Cans, Michel; Bastian, Fernando Luíz

doi:10.1016/0262-8856(95)97286-u

Cited by 4 publications

(5 citation statements)

References 30 publications

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“…Building upon this approach, in [2,3], the classification of images containing fatigue is proposed by categorizing them into three groups: (1) fractured surface imaging, (2) damaged surface imaging, and (3) deformed surface imaging. Each category corresponds to different acquisition and processing methods.…”

Section: Introductionmentioning

confidence: 99%

Image Processing for the Detection and Analysis of Microcracks Caused by Fatigue in Steel

Castro-Egler,

Garcia-Gonzalez,

Cruces

et al. 2023

Preprint

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This article presents a method that uses a semi-automatic algorithm for the detection and analysis of microcracks in steel test specimens using binarized image analysis. It obtains the length along the crack path in contrast to previous methods that have obtained linear length, thereby achieving a closer approximation to its actual value. Additionally, this method automatically calculates the COD and COA parameters with measurement deviations in micrometres, thus providing greater precision than previous methods proposed to date.

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Section: Introductionmentioning

confidence: 99%

Image Processing for the Detection and Analysis of Microcracks Caused by Fatigue in Steel

Castro-Egler,

Garcia-Gonzalez,

Cruces

et al. 2023

Preprint

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“…Despite the approach based on Fast Fourier Transforms (FFT), which needs large areas of well‐defined striations (Savary et al, ), the preferred striations spacing measurement method consists of the counting of striations displaced along a line parallel to crack growth direction, marked on digital images from a scanning electron microscope (SEM) and counting the grayscale peaks in corresponding profile (Hershko et al, ). It means that this method does not depend on the noise level or the regularity and extension of striation formations as FFT based ones, and the calibration is quite simple.…”

Section: Introductionmentioning

confidence: 99%

Correlative light‐electron fractography for fatigue striations characterization in metallic alloys

Hein

Oliveira

Campos

2013

Microscopy Res & Technique

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The correlative light-electron fractography technique combines correlative microscopy concepts to the extended depth-from-focus reconstruction method, associating the reliable topographic information of 3-D maps from light microscopy ordered Z-stacks to the finest lateral resolution and large focus depth from scanning electron microscopy. Fatigue striations spacing analysis can be precisely measured, by correcting the mean surface tilting with the knowledge of local elevation data from elevation maps. This new technique aims to improve the accuracy of quantitative fractography in fatigue fracture investigations.

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“…The fracture surface topography contains useful information: the loading history, the energy consumed on crack growth, the resistance of microstructural features against loading at crack front, extension of process zones, etc. Many techniques have been developed to measure fracture topography, being a large number of them based on scanning electron microscopy (SEM), including stereo reconstruction (Azevedo and Marques, ), frequency domain methods (Savary et al ., ), and direct measurement of fractal dimension data (Wzorek et al ., ). Stereo reconstruction quality mostly depends on the details revealed at the surface (Hein, ), with coating and beam voltage intensity being important issues.…”

Section: Introductionmentioning

confidence: 99%

A Brief Discussion About Image Quality and SEM Methods for Quantitative Fractography of Polymer Composites

Hein¹,

Campos²,

Caltabiano³

et al. 2012

Scanning

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The methodology for fracture analysis of polymeric composites with scanning electron microscopes (SEM) is still under discussion. Many authors prefer to use sputter coating with a conductive material instead of applying low-voltage (LV) or variable-pressure (VP) methods, which preserves the original surfaces. The present work examines the effects of sputter coating with 25 nm of gold on the topography of carbon-epoxy composites fracture surfaces, using an atomic force microscope. Also, the influence of SEM imaging parameters on fractal measurements is evaluated for the VP-SEM and LV-SEM methods. It was observed that topographic measurements were not significantly affected by the gold coating at tested scale. Moreover, changes on SEM setup leads to nonlinear outcome on texture parameters, such as fractal dimension and entropy values. For VP-SEM or LV-SEM, fractal dimension and entropy values did not present any evident relation with image quality parameters, but the resolution must be optimized with imaging setup, accompanied by charge neutralization.

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Characterization of optical, electronic and topographic images in fatigue research

Cited by 4 publications

References 30 publications

Image Processing for the Detection and Analysis of Microcracks Caused by Fatigue in Steel

Image Processing for the Detection and Analysis of Microcracks Caused by Fatigue in Steel

Correlative light‐electron fractography for fatigue striations characterization in metallic alloys

A Brief Discussion About Image Quality and SEM Methods for Quantitative Fractography of Polymer Composites

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