Confocal laser scanning microscopy: The technique for quantitative fractographic analysis

Merson, Evgeniy; Danilov, Vladimir; Мерсон, Д. Л.

doi:10.1016/j.engfracmech.2017.04.026

Cited by 39 publications

(7 citation statements)

References 23 publications

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“…size, morphology, location, neighborhood interaction, etc. Post-mortem analysis is currently performed in scanning electronic microscopy (SEM), and more recently in white light and laser scanning confocal microscopy (LSCM) [33,34]. The latter technique provides topographic characterization with lateral and depth resolutions lower than 0.01 μm with an appreciable repeatability.…”

mentioning

confidence: 99%

Effect of porosities on brazed martensitic steel tensile properties: 2D and 3D pre-mortem vs post-mortem characterizations

Vanderesse

Texier

Bocher

2020

Materials Characterization

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A quantitative investigation of the porosity and its effects on mechanical properties was conducted on brazed materials presenting macroscopically brittle behavior with various defect levels. Three different techniques for evaluating the porosity and the fracture mechanisms were compared: (i) pre-mortem X-ray computed tomography (XCT), (ii) post-mortem laser scanning confocal microscopy (LSCM), and (iii) post-mortem scanning electron microscopy (SEM). The apparent surface area of the pores was evaluated by segmenting the height maps produced by LSCM and the electron backscattered images produced by SEM. The results show good agreement for different porosity levels. The LSCM height maps for opposite fracture faces were virtually stitched together in order to reconstruct three-dimensional (3D) images of the whole brazed joints. These proved to be similar to the XCT 3D segmented images, yet with some discrepancies due to local plastic deformation. Quantitative volume fraction and spatial distribution of pores were assessed as well as the identification of fracture mechanisms. Interestingly, it was noted that two specimens with different ultimate tensile strengths presented the same porosity amount, but different distributions. Two distinctive features were identified in the broken specimens: plastically teared pillars and walls that were separating the pores before fracture, and plateaus of approximately constant height with micro-sized dimples showing interfacial fracture. Although the specimens exhibited a macroscopic brittle behavior, these features are characteristic of ductile fracture. The most probable scenario for fracture was conjectured as follows: (i) Final fracture occurs in the near-surface region of the samples and conversely early damage develops in the volume, (ii) Interfacial fracture within plateaus is responsible of the rupture/strength of the brazed specimen but detrimental effect is induced by the tearing if highly voided regions are present in the joint.

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confidence: 99%

Effect of porosities on brazed martensitic steel tensile properties: 2D and 3D pre-mortem vs post-mortem characterizations

Vanderesse

Texier

Bocher

2020

Materials Characterization

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“…At least on the scale of the region as small as 128×128µm the 2D images clearly representing all elements of the brittle cleavage fracture surfaces can be obtained by CLSM. The resolution and quality of such images is high enough to rival with those captured by SEM at the same magnification [22]. A primary use of circular dichroism is in analyzing the secondary structure or conformation of macromolecules, particularly proteins as secondary structure is sensitive to its environment, temperature or pH, circular dichroism can be used to observe how secondary structure changes with environmental conditions or on interaction with other molecules.…”

Section: Techniques That Can Be Used To Analyze Wheymentioning

confidence: 99%

Applications of Whey as A Valuable Ingredient in Food Industry

Chandrajith

2018

JDVS

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Many scientific researches have been carried out on utilization of whey which is considered as a waste in dairy industry. It is hazardous to dispose whey directly in to the environment because several toxic substances are formed during decomposition of whey and it can cause several harmful consequences on the environment. Whey protein fraction consists of many useful nutrients that can be benefitial to human nutrition. This study presents the possible applications on whey in food industry and other fields and the possibility to recycle the whey incorporating them in to secondary dairy products.

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“…The SB activity manifests itself as shear steps on a polished surface of a deformed sample and can be revealed with the surface profile analysis. The surface morphology of sheared BMGs has been frequently observed in the 2D-mode by means of scanning electron microscopy (SEM) [27][28][29], or in the 3D-mode by atomic force microscopy (AFM) [30][31][32] or confocal laser scanning microscopy (CLSM) [33]. In comparison with CLSM and AFM, scanning white light interferometry (SWLI) is more suitable for the 3D mapping of the SB topology due to a combination of the unbeatable vertical resolution up to 0.1 nm and rapid scanning of the area up to 1 cm 2 [34].…”

Section: Introductionmentioning

confidence: 99%

Shear Bands Topology in the Deformed Bulk Metallic Glasses

Seleznev

Vinogradov

2020

Metals

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Recent experimental studies revealed the presence of Volterra dislocation-type long-range elastic strain/stress field around a shear band (SB) terminated in a bulk metallic glass (BMG). The corollary from this finding is that shear bands can interact with these stress fields. In other words, the mutual behaviour of SBs should be affected by their stress fields superimposed with the external stresses. In order to verify this suggestion, the topography of the regions surrounding SBs terminated in the BMGs was carefully analysed. The surfaces of several BMGs, deformed by compression and indentation, were investigated with a high spatial resolution by means of scanning white-light interferometry (SWLI). Along with the evidence for the interaction between SBs, different scenarios of the SB propagation have been observed. Specifically, the SB path deviation, mutual blocking, and deflection of SBs were revealed along with the significant differences between the topologies of the mode II (in-plane) and mode III (out of plane) SBs. While the type II shear manifests a linear propagation path and a monotonically increasing shear offset, the type III shear is associated with a curved, segmented path and a non-monotonically varying shear offset. The systematic application of the “classic” elastic Volterra’s theory of dislocations to the behaviour of SBs in BMGs provides new insight into the widely reported experimental phenomena concerning the SB morphology, which is further detailed in the present work.

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Confocal laser scanning microscopy: The technique for quantitative fractographic analysis

Cited by 39 publications

References 23 publications

Effect of porosities on brazed martensitic steel tensile properties: 2D and 3D pre-mortem vs post-mortem characterizations

Effect of porosities on brazed martensitic steel tensile properties: 2D and 3D pre-mortem vs post-mortem characterizations

Applications of Whey as A Valuable Ingredient in Food Industry

Shear Bands Topology in the Deformed Bulk Metallic Glasses

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