Special Issue "Micro Non-Destructive Testing and Evaluation"
Deadline for manuscript submissions: 31 December 2020.
Interests: neutron diffraction; residual stress; mechanical properties of materials; additive manufacturing; porous ceramics
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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
Manuscript Submission Information
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