Symmetry and Asymmetry in Nondestructive Testing

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Engineering and Materials".

Deadline for manuscript submissions: 1 August 2027 | Viewed by 832

Special Issue Editors


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Guest Editor
School of Advanced Manufacturing, Clover Park Technical College, Lakewood, WA, USA
Interests: ultrasonic nondestructive testing; electromagnetic testing; radiography
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Guest Editor
School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou, China
Interests: ultrasonic nondestructive testing; additive manufacturing

Special Issue Information

Dear Colleagues,

Symmetry and asymmetry are ubiquitous phenomena in nondestructive testing (NDT). The following are examples: a metal test object may have a certain crystalline symmetry; a composite test object may have a symmetric/asymmetric layup; the ultrasonic testing method may use symmetric/asymmetric wave modes in physics; and the electromagnetic testing may use symmetric/asymmetric coil arrangements. There are too many examples of symmetry and asymmetry in nondestructive testing to name all of them. Therefore, this abundance would inspire new research in NDT from the perspective of symmetry and asymmetry.

We are pleased to invite you to submit your manuscripts about symmetry/asymmetry phenomena in nondestructive testing to this Special Issue. In this Special Issue, original research articles and review articles are welcome. Research areas may include, but are not limited to, the following: ultrasonic nondestructive testing, electromagnetic testing, radiography testing, visual testing, infrared thermography, acoustic emission, and microwave testing.

We look forward to receiving your contributions.

Dr. Gaofeng Sha
Prof. Dr. Yang Li
Guest Editors

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Keywords

  • symmetry
  • asymmetry
  • ultrasonic nondestructive testing
  • electromagnetic testing
  • radiography testing
  • visual testing
  • infrared thermography
  • acoustic emission
  • microwave testing

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Published Papers (1 paper)

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Research

24 pages, 2645 KB  
Article
Correlation Between Ultrasonic Scattering Coefficients and Orientation Distribution Coefficients (ODCs) in Textured Polycrystalline Materials with Arbitrary Crystallite Symmetry
by Gaofeng Sha
Symmetry 2026, 18(2), 283; https://doi.org/10.3390/sym18020283 - 3 Feb 2026
Viewed by 461
Abstract
Elastic wave scattering in polycrystalline materials has been a long-lasting topic in seismology and physical acoustics. Numerous analytical scattering models have been reported for polycrystals with random grain orientations. However, the elastic wave scattering in polycrystals with a preferred grain orientation (crystallographic texture) [...] Read more.
Elastic wave scattering in polycrystalline materials has been a long-lasting topic in seismology and physical acoustics. Numerous analytical scattering models have been reported for polycrystals with random grain orientations. However, the elastic wave scattering in polycrystals with a preferred grain orientation (crystallographic texture) has not been well studied. This study develops a general ultrasonic scattering model that correlates the scattering coefficients and attenuation coefficients with orientation distribution coefficients (ODCs) for polycrystalline materials with a crystallographic texture. These models are valid for aggregates of triclinic grains with arbitrary texture symmetry. Since different terminologies for orientation distribution functions (ODFs) are adopted in quantitative texture analysis, the relations between different terminologies are also summarized in this study. Furthermore, for two special cases—hexagonal polycrystalline materials with a fiber texture and cubic polycrystalline materials with orthotropic texture symmetry—explicit expressions for the ultrasonic backscattering coefficient through ODCs are derived. The explicit relationship between ultrasonic backscattering and ODCs not only manifests how the individual texture coefficients impact ultrasonic scattering but also makes it possible to determine ODCs up to the eighth order experimentally from ultrasonic scattering measurements. This type of forward model also can be applied to the microstructure characterization of textured polycrystals. Full article
(This article belongs to the Special Issue Symmetry and Asymmetry in Nondestructive Testing)
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