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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Journal ArticleDOI
Smart structure for composite repair
TL;DR: In this paper, a boron/epoxy composite patch repair is artificially degraded through the introduction of teflon inserts at the bond line, and PZT elements attached to the patch and host structure are then excited and sensed in both transfer function and self-impedance configurations and the measurements examined to assess whether bond degradation is detectable.
Journal ArticleDOI
Lamb wave–based detection of a controlled disbond in a lap joint:
TL;DR: In this article, Lamb waves have been used to monitor lap joints against defects such as disbonds in aircraft and bridges, but there is no evidence that they can reliably detect disbond defects.
Proceedings ArticleDOI
Integrated piezoceramic transducers for imaging damage in composite laminates
TL;DR: In this paper, a two-phase imaging methodology was proposed to characterise damage in composite laminates using Lamb wave pulses generated by integrated piezoceramic transducers.
Journal ArticleDOI
Reduced length fibre Bragg gratings for high frequency acoustic sensing
TL;DR: In this article, the authors investigated the effect of gauge length on frequency response for sensing of acoustic waves and showed that the ratio of wavelength to gauge length must be at least 8.8 in order to reliably resolve the strain response without significant gain roll-off.
Journal ArticleDOI
Autonomous detection of crack initiation using surface-mounted piezotranducers
TL;DR: In this article, an in situ health monitoring system, comprising an array of piezoceramic wafer elements, was used to detect fatigue degradation in metallic specimens exposed to cyclic loading.