NDLI: Simulation of laser-generated ultrasonic wave propagation in solid media and air with application to NDE

Content Provider	Springer Nature Link
Author	Panta, A. Cerniglia, D.
Copyright Year	2009
Abstract	Ultrasonic methods are well known as powerful and reliable tool for defect detection. In the previous decades focus and interest have been directed to non-contact sensors and methods, showing many advantages over contact techniques where inspection depends on contact conditions (pressure, coupling medium, contact area). The non-contact hybrid ultrasonic method described here is of interest for many applications, requiring periodic inspection in service or after manufacturing. Despite the potential impact of laser-generated ultrasound in many areas of industry, robust tools for studying the phenomenon are lacking and thus limit the design and optimization of non-destructive testing and evaluation techniques. Here a specific numerical method is presented to efficiently and accurately solve ultrasound wave propagation problems with frequencies in the MHz range traveling in relatively large bodies and through air. This work improves a previous numerical model where propagation of the acoustic waves through air had not been considered, allowing us to simulate the presence of a non-contact transducer in reception in order to simulate numerically the complete experimental setup. It is very important to limit the amount of air to be considered in the FE analyses; otherwise the computational cost would often exceed the resources available. A way to solve the problem is to implement non-reflecting boundary conditions. A non-reflecting boundary condition allows all outgoing waves to exit the domain at the boundary where they have been imposed without reflection; thus, it is possible to model only the portion of air between the non-contact transducer and the solid under testing. Several numerical and experimental analyses were conducted on a 136 lb AREMA rail; here we study in detail two fully non-contact testing configurations for the rail head and web. The information that can be acquired is very valuable for choosing the right setup and configuration when performing non-contact hybrid ultrasonic inspection.
Ending Page	336
Page Count	10
Starting Page	327
File Format	PDF
ISSN	09478396
e-ISSN	14320630
Journal	Applied Physics A
Issue Number	2
Volume Number	98
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-09-16
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Condensed Matter Physics Operating Procedures, Materials Treatment Optical and Electronic Materials Characterization and Evaluation of Materials Surfaces and Interfaces, Thin Films Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Science

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