Rahul Jain - Profile on Academia.edu (original) (raw)
Related Authors
Indian Institute of Technology Delhi
Uploads
Papers by Rahul Jain
The scientific community across the globe is thrusting significant efforts toward the development... more The scientific community across the globe is thrusting significant efforts toward the development of new techniques for structural health monitoring (SHM) and non-destructive evaluation (NDE), which could be equally suitable for civil-structures, heavy machinery, aircraft and spaceships. This need arises from the fact that intensive usage combined with long endurance causes gradual but unnoticed deterioration in structures, often leading to unexpected disasters, such as the Columbia Shuttle breakdown in 2003. For wider application, the techniques should be automatic, sufficiently sensitive, unobtrusive and cost-effective. In this endeavour, the advent of the smart materials and structures and the related technologies have triggered a new revolution. Smart piezoelectric-ceramic lead zirconate titanate (PZT) materials, for example, have recently emerged as high frequency impedance transducers for SHM and NDE. In this role, the PZT patches act as collocated actuators and sensors and employ ultrasonic vibrations (typically in 30-400 kHz range) to glean out a characteristic admittance 'signature' of the structure. The admittance signature encompasses vital information governing the phenomenological nature of the structure, and can be analysed to predict the onset of structural damages. As impedance transducers, the PZT patches exhibit excellent performance as far as damage sensitivity and cost-effectiveness are concerned. Typically, their 157
The scientific community across the globe is thrusting significant efforts toward the development... more The scientific community across the globe is thrusting significant efforts toward the development of new techniques for structural health monitoring (SHM) and non-destructive evaluation (NDE), which could be equally suitable for civil-structures, heavy machinery, aircraft and spaceships. This need arises from the fact that intensive usage combined with long endurance causes gradual but unnoticed deterioration in structures, often leading to unexpected disasters, such as the Columbia Shuttle breakdown in 2003. For wider application, the techniques should be automatic, sufficiently sensitive, unobtrusive and cost-effective. In this endeavour, the advent of the smart materials and structures and the related technologies have triggered a new revolution. Smart piezoelectric-ceramic lead zirconate titanate (PZT) materials, for example, have recently emerged as high frequency impedance transducers for SHM and NDE. In this role, the PZT patches act as collocated actuators and sensors and employ ultrasonic vibrations (typically in 30-400 kHz range) to glean out a characteristic admittance 'signature' of the structure. The admittance signature encompasses vital information governing the phenomenological nature of the structure, and can be analysed to predict the onset of structural damages. As impedance transducers, the PZT patches exhibit excellent performance as far as damage sensitivity and cost-effectiveness are concerned. Typically, their 157