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Title: A finite element model investigation of ultrasonic array performance for inspecting polycrystalline materials

Microstructural noise has long hindered ultrasonic NDE of polycrystalline materials. In recent years however, arrays have enabled new possibilities to advance ultrasonic inspection of these materials. A Finite Element (FE) model is used to explore the different phenomena caused by grain scattering which may hinder detection of defects by an array. These include multiple scattering and beam deviation due to anisotropy; two aspects of the physics which are often required to be ignored in analytical models due to theoretical assumptions or computational limitations. We rely on a GPU based FE solver, Pogo, to provide fast computation and thereby enable parametric studies. The impact on array detection performance when varying center-frequency and aperture size is investigated. Preliminary results show that there exists an optimum for both the array aperture and frequency for inspection of these materials.
Authors:
 [1] ; ;  [2] ;  [3]
  1. Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, United Kingdom and E.ON Technologies Limited, Technology Centre, Nottingham, NG11 0EE (United Kingdom)
  2. Department of Mechanical Engineering, Imperial College London, London SW7 2AZ (United Kingdom)
  3. E.ON Technologies Limited, Technology Centre, Nottingham, NG11 0EE (United Kingdom)
Publication Date:
OSTI Identifier:
22391196
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1650; Journal Issue: 1; Conference: 41. Annual Review of Progress in Quantitative Nondestructive Evaluation, Boise, ID (United States), 20-25 Jul 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANISOTROPY; FINITE ELEMENT METHOD; MATERIALS TESTING; MICROSTRUCTURE; MULTIPLE SCATTERING; POLYCRYSTALS; ULTRASONIC TESTING