Theoretical Background and Prognostic Modeling for Benchmarking SHM Sensors for Composite Structures

Vadim Smelyanski, Vasyl Hafiychuk, Dmitry G. Luchinsky, Curtis Banks, Jim Miller, and Mike Watson
Submission Type: 
Full Paper
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phmc_10_077.pdf915.54 KBOctober 12, 2010 - 2:52pm

This paper reports on analytical as well as computer
simulation of waves propagating in sandwich-type
composite structures. Sandwich-type composites are being
studied for use in NASA’s new heavy lift launch vehicle,
and flaw detection is crucial for safety and for failure
prognostics. Theoretical analysis, as well as numerical
modeling, is needed for benchmarking of available
technologies for structural health monitoring (SHM)
sensors and sensor systems. This benchmarking activity is
important for answering the basic question of what
minimum flaw size can be detected by the existing SHM
based monitoring methods.
Sandwich panels with foam, WebCore and
honeycomb structures were considered for use in this
study. Eigenmode frequency analysis and Frequency
Response Analysis of the panels were made to understand
fundamental properties of the panel physics and limitations
that may affect the application of current SHM sensors and
methods.
An analytical study of the transient wave propagation
is considered based on Mindlin plate theory. The mathematical
model, accompanied by numerical simulations,
shows that small size defects can be recognized but the
frequency of waves should be sufficiently high. It is
concluded that a combination of analytical results coupled
with the high-fidelity simulations should make it possible
to analyze experimental data and to predict the
applicability of SHM methods for this type of structure.

Publication Control Number: 
077
Submission Keywords: 
sandwich panel
WebCore
Honeycomb panel
wave propagation
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