Voronoi based microstructure modelling for elastic wave propagation
S. Shivaprasad,Krishnan Balasubramaniam,C. V. Krishnamurthy +2 more
- Vol. 1706, Iss: 1, pp 070013
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TLDR
In this article, the role of anisotropy and grain size distribution on an ultrasonic beam was analyzed in a model characterized by grain size distributions and grain orientation distribution in a polycrystalline medium constructed using Voronoi tessellations.Abstract:
Ultrasonic assessment of materials and defects are affected by microstructural parameters like grain size and texture. When a beam of ultrasound propagates in a polycrystalline medium, it undergoes extensive scattering by grains, grain boundaries and other microstructural features such as dislocations, voids, micro cracks etc. To understand the role of anisotropy and grain size distribution on an ultrasonic beam, a model system is proposed for carrying out ultrasonic wave propagation in a model characterized by grain size distribution and grain orientation distribution. A 2D polycrystalline medium constructed using Voronoi tessellations with a specific grain size distribution is considered and orientational averaging studies are carried out.read more
Citations
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Journal ArticleDOI
Finite-element modelling of elastic wave propagation and scattering within heterogeneous media
TL;DR: The quantitative agreement is found to be excellent across previously unvisited scattering regimes; it is believed that this is the first quantitative validation of its kind which provides significant support towards the existence of the transitional scattering regime and facilitates future deployment of numerical methods for these problems.
Journal ArticleDOI
Numerical Modelling Methods for Ultrasonic Wave Propagation Through Polycrystalline Materials
S. Shivaprasad,C. V. Krishnamurthy,Abhishek Pandala,Anuraag Saini,Adithya Ramachandran,Krishnan Balasubramaniam +5 more
TL;DR: In this paper, the development at Centre for Non-destructive Evaluation, Indian Institute of Technology Madras, of three different numerical methods, namely finite element, ray tracing and finite-difference time-domain methods for investigating the propagation of ultrasonic waves through polycrystalline media.
Journal ArticleDOI
Modeling and simulation of ultrasonic beam skewing in polycrystalline materials
TL;DR: In this paper, a Voronoi tessellation algorithm is used to represent an equiaxed polycrystalline morphology and numerical simulations are performed on beam skewing in both weak (Aluminum) and strong (Copper) anisotropic media as a function of beam launch angles.
Journal ArticleDOI
Triple junctions network as the key pattern for characterisation of grain structure evolution in metals
TL;DR: In this paper, the structural entropy was proposed as a descriptor of the network of triple junctions that governs continuous dynamic recrystallisation of copper alloys. But, the proposed descriptor is not suitable for the characterization of alloys and it is difficult to apply to alloys due to the limited available characterisation data.
References
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Journal ArticleDOI
The geometrical properties of irregular two-dimensional Voronoi tessellations
TL;DR: In this paper, the authors describe a parameter used to quantify the regularity of two-dimensional Voronoi tessellations based upon assemblies of hard core discs, which may vary continuously from zero to one, for a completely random Poisson Voroni Tessellation, to one for a fully ordered regular hexagonal honeycomb.
Journal ArticleDOI
Numerical model of longitudinal wave scattering in polycrystals
Goutam Ghoshal,Joseph A. Turner +1 more
TL;DR: Numerical results show good agreement with the theory for the examples examined with evidence that the correlation function is frequency dependent and are anticipated to impact ultrasonic NDE of polycrystalline media.
Journal ArticleDOI
Comparison between experimental and 2-D numerical studies of multiple scattering in Inconel600 by means of array probes.
TL;DR: The main objective of the present work is to evaluate the ability of the finite-element code ATHENA 2D to reproduce typical features of multiple wave scattering in the context of ultrasonic non-destructive evaluation, with an array of sources and receivers.
Journal ArticleDOI
Experimental and computational studies of ultrasound wave propagation in hexagonal close-packed polycrystals for texture detection
TL;DR: In this article, the relationship between bulk texture and ultrasonic wave velocity in aggregates of hexagonal close-packed (hcp) grains is investigated using theoretical, numerical and experimental methods.
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