N
Nik Rajic
Researcher at Defence Science and Technology Organisation
Publications - 78
Citations - 1525
Nik Rajic is an academic researcher from Defence Science and Technology Organisation. The author has contributed to research in topics: Lamb waves & Structural health monitoring. The author has an hindex of 17, co-authored 75 publications receiving 1329 citations. Previous affiliations of Nik Rajic include DST Systems.
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Principal component thermography for flaw contrast enhancement and flaw depth characterisation in composite structures
TL;DR: In this article, principal component thermography (PCT) is applied to the non-destructive inspection of composite structures, and a simple analytical expression is derived that relates a characteristic time furnished by the decomposition to the flaw depth, providing a basis for flaw depth estimation.
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Thermography as a tool for damage assessment
TL;DR: In this article, the use of finite element (FE) analysis to simulate the thermographic process for complex non-axisymmetric geometries has been presented, and a suitably calibrated finite element simulation has been generated and validated.
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Towards a practical structural health monitoring technology for patched cracks in aircraft structure
TL;DR: In this article, a case history is presented on the application of a simple strain-based Structural Health Monitoring (SHM) approach for monitoring the boron/epoxy patch repair of a critical fatigue crack in an F-111C wing.
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NDTE using pulse thermography : Numerical modeling of composite subsurface defects
TL;DR: In this article, the authors look at the finite element modeling (FEM) of delaminations in a composite flat plate setup and show that the 2D approximation associated with this technique ignores a paramount effect in the form of lateral thermal diffusion.
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Effects of local stiffness changes and delamination on Lamb wave transmission using surface-mounted piezoelectric transducers
Y L Koh,Wing Kong Chiu,Nik Rajic +2 more
TL;DR: In this paper, the effects of impact damage and delamination of plate-like structures on the Lamb wave mode were quantitatively determined, and the effect of the size, properties and orientation of the damage upon a propagating Lamb wave was qualitatively determined.