Special Issue "Micro Non-Destructive Testing and Evaluation"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Structure Analysis and Characterization".

Deadline for manuscript submissions: 31 December 2020.

Special Issue Editor

Prof. Dr. Giovanni Bruno
E-Mail Website
Guest Editor
Bundesanstalt für Materialforschung und –prüfung (BAM), Berlin, Germany
Interests: neutron diffraction; residual stress; mechanical properties of materials; additive manufacturing; porous ceramics
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Special Issue Information

Dear Colleagues,

What is meant by ‘Micro Non-Destructive Testing and Evaluation’? This is the central subject of debate in this Special Issue.

At present, sub-millimeter size components or even assemblies are pervading the industrial and scientific world. Classic examples are electronic devices and watches (as well as parts thereof), but recent ones encompass additively manufactured lattice structures, stents or other microparts. Moreover, most assemblies contain micro-components. Testing such components or their miniaturized parts would fit well within the topic of micro non-destructive testing and evaluation.

In all cases, performance and integrity testing, quality control, and dimensional tolerances need to be measured at sub-millimeter level (ideally with a spatial resolution of about a micron); most of the time, such features and components are embedded in much larger assemblies. The solution to this dilemma depends on the part and on the problem under consideration.

Another possible definition of micro non-destructive testing and evaluation can relate to characterization of micro-features (e.g., the microstructure) in much larger specimens, such as, for instance, damage in concrete cores, but also porosity in additively manufactured components.

A further aspect is the use of microscopic probes to evaluate macroscopic properties. This is the case, for instance, but not at all exclusively, in the use of diffraction techniques to determine macroscopic stresses

The splits between testing and characterization at micro-level (or of micro parts) from one side and handling of macroscopic assemblies on the other represent a great challenge for many fields of materials characterization. On top of that, including the use of microscopic methods to test integrity would add a further level of complexity.

Imaging, mechanical testing, measurement of properties, structural health monitoring, and dimensional metrology need to be re-defined if we want to cope with the multi-faceted topic of micro non-destructive testing and evaluation.

The challenge has already been accepted by the scientific and engineering communities for a while but is still far from being universally tackled.

This Special Issue aims at presenting the progress made and the different aspects of the challenge as well as at indicating the paths for the future of NDTE.

Prof. Dr. Giovanni Bruno
Guest Editor

Manuscript Submission Information

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Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.


  • micro-scale
  • imaging
  • characterization
  • metrology
  • components
  • micro-parts
  • quality

Published Papers (1 paper)

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Open AccessArticle
Structural and Morphological Quantitative 3D Characterisation of Ammonium Nitrate Prills by X-Ray Computed Tomography
Materials 2020, 13(5), 1230; https://doi.org/10.3390/ma13051230 - 09 Mar 2020
The mixture of ammonium nitrate (AN) prills and fuel oil (FO), usually referred to as ANFO, is extensively used in the mining industry as a bulk explosive. One of the major performance predictors of ANFO mixtures is the fuel oil retention, which is [...] Read more.
The mixture of ammonium nitrate (AN) prills and fuel oil (FO), usually referred to as ANFO, is extensively used in the mining industry as a bulk explosive. One of the major performance predictors of ANFO mixtures is the fuel oil retention, which is itself governed by the complex pore structure of the AN prills. In this study, we present how X-ray computed tomography (XCT), and the associated advanced data processing workflow, can be used to fully characterise the structure and morphology of AN prills. We show that structural parameters such as volume fraction of the different phases and morphological parameters such as specific surface area and shape factor can be reliably extracted from the XCT data, and that there is a good agreement with the measured oil retention values. Importantly, oil retention measurements (qualifying the efficiency of ANFO as explosives) correlate well with the specific surface area determined by XCT. XCT can therefore be employed non-destructively; it can accurately evaluate and characterise porosity in ammonium nitrate prills, and even predict their efficiency. Full article
(This article belongs to the Special Issue Micro Non-Destructive Testing and Evaluation)
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