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Volume 4
Nano Research & Applications
ISSN: 2471-9838
Notes:
JOINT EVENT
October 04-05, 2018 Moscow, Russia
&
2
nd
Edition of International Conference on
26
th
International Conference on
Advanced Nanotechnology
Materials Technology and Manufacturing Innovations
Advanced Nanotechnology 2018
& Materials-Manufacturing 2018
October 04-05, 2018
Page 60
Igor Solodov
University of Stuttgart, Germany
Igor Solodov, Nano Res Appl 2018, Volume 4
DOI: 10.21767/2471-9838-C5-020
Non-destructive characterization and testing of composite materials by using mechanical
resonance of defects
P
lanar sub-surface defects are characteristic modes of failure that are induced by impacts, fatigue stresses, deviations
in production process in a wide class of materials and components, including rolled sheet metals, fibre-reinforced
concrete and plastics, and additive manufacturing in 3D printing solutions. To detect these defects, various classical
methods of non-destructive testing (NDT) of materials were developed and applied: optical shearography, eddy current,
multiple versions of thermography, and ultrasonic techniques. A novel NDT methodology proposed makes use of
mechanical resonance of the defect areas. It is based on the effect of local defect resonance (LDR) which develops if
the defect is activated by mechanical excitation whose frequency matches to its natural vibration frequency. The latter
is based on the fact that inclusion of a defect leads to a local decrease of rigidity for a certain mass of the material that
manifests in a particular characteristic frequency of the defect. Under the frequency match condition, the input energy is
delivered and trapped selectively in the defect area that increases dramatically its vibration amplitude. The LDR approach
thus enhances substantially the sensitivity and efficiency of the classical NDT techniques based on mechanical activation
of defects. Besides, the locality of the resonance enables to visualize the defect area and to quantify its size and shape. The
case studies to be considered include resonant imaging of various defects in composite materials via laser vibrometry,
thermosonics and nonlinear techniques.
Recent Publications
1. Solodov I, Bai J, Bekgulyan S and Busse G (2011) A local defect resonance to enhance acoustic wave-defect
interaction in ultrasonic nondestructive testing. Applied Physics Letters. 99:211911.
2. Solodov I, Bai J and Busse G (2013) Resonant ultrasonic spectroscopy of defects: case study of flat-bottomed
holes. Journal of Applied Physics. 113:223512.
Biography
Igor Solodov is Guest Professor at Institute of Plastics Technology. His research mainly focuses on Ultrasonic & Nonlinear Mechanics.
igor.solodov@ikt.uni-stuttgart.de