Identification of delamination interface in composite laminates using scattering characteristics of lamb wave

Numerical and experimental studies

Rakesh Kumar Singh, C. Ramadas, P. Balachandra Shetty, K. G. Satyanarayana

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Considering the superior strength properties of polymer based composites over metallic materials, they are being used in primary structures of aircrafts. However, these polymeric materials are much more complex in behaviour due to their structural anisotropy along with existence of different materials unlike in metallic alloys. These pose challenge in flaw detection, residual strength determination and life of a structure with their high susceptibility to impact damage in the form of delaminations/disbonds or cracks. This reduces load-bearing capability and potentially leads to structural failure. With this background, this study presents a method to identify location of delamination interface along thickness of a laminate. Both numerical and experimental studies have been carried out with a view to identify the defect, on propagation, mode conversion and scattering characteristics of fundamental anti-symmetric Lamb mode (Ao) when it passed through a semi-infinite delamination. Further, the reflection and transmission scattering coefficients based on power and amplitude ratios of the scattered waves have been computed. The methodology was applied on numerically simulated delaminations to illustrate the efficacy of the method. Results showed that it could successfully identify delamination interface.

Original languageEnglish
Article number045017
JournalSmart Materials and Structures
Volume26
Issue number4
DOIs
Publication statusPublished - 09-03-2017

Fingerprint

Lamb waves
Delamination
Surface waves
laminates
Laminates
structural failure
residual strength
Scattering
impact damage
nondestructive tests
composite materials
propagation modes
Composite materials
scattering coefficients
scattering
aircraft
cracks
methodology
magnetic permeability
Bearings (structural)

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Civil and Structural Engineering
  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering

Cite this

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abstract = "Considering the superior strength properties of polymer based composites over metallic materials, they are being used in primary structures of aircrafts. However, these polymeric materials are much more complex in behaviour due to their structural anisotropy along with existence of different materials unlike in metallic alloys. These pose challenge in flaw detection, residual strength determination and life of a structure with their high susceptibility to impact damage in the form of delaminations/disbonds or cracks. This reduces load-bearing capability and potentially leads to structural failure. With this background, this study presents a method to identify location of delamination interface along thickness of a laminate. Both numerical and experimental studies have been carried out with a view to identify the defect, on propagation, mode conversion and scattering characteristics of fundamental anti-symmetric Lamb mode (Ao) when it passed through a semi-infinite delamination. Further, the reflection and transmission scattering coefficients based on power and amplitude ratios of the scattered waves have been computed. The methodology was applied on numerically simulated delaminations to illustrate the efficacy of the method. Results showed that it could successfully identify delamination interface.",
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Identification of delamination interface in composite laminates using scattering characteristics of lamb wave : Numerical and experimental studies. / Singh, Rakesh Kumar; Ramadas, C.; Shetty, P. Balachandra; Satyanarayana, K. G.

In: Smart Materials and Structures, Vol. 26, No. 4, 045017, 09.03.2017.

Research output: Contribution to journalArticle

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AU - Singh, Rakesh Kumar

AU - Ramadas, C.

AU - Shetty, P. Balachandra

AU - Satyanarayana, K. G.

PY - 2017/3/9

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