Research Interests

Use of HNSWs as a novel tool for NDE

This project aims at developing an innovative Structural Health Monitoring (SHM)/Non Destructive Evaluation (NDE) scheme based on the generation of highly nonlinear solitary waves (HNSWs). HNSWs are stress waves that can form and travel in highly nonlinear systems (i.e. granular, layered, fibrous or porous materials) with a finite spatial dimension independent of the wave amplitude. Compared to conventional linear waves, the generation of HNSWs is very tunable and does not rely on the use of electronic equipment (such as an arbitrary function generator) and on the response of piezoelectric crystals or other transduction mechanism.

Simple configuration for the generation of HNSWs in structural materials

Use of HNSWs-induced stress waves for the detection of simulated damage in a concrete slab

Relevant publications

*Ni, X., *Garden, R., and Rizzo, P. (2009). “Novel Actuator Based on the Stress Wave Propagation in Highly Nonlinear Materials,” Proceedings of the 7th International Workshop on Structural Health Monitoring, Ed. F.-K. Chang, Stanford, CA, September 9-11, in press.

Ni*, X., Rizzo, P., and Daraio, C. (2009). “Novel Sensor Technology for NDE of Concrete,” Proceedings of SPIE’s 16th Annual International Symposium on Smart Structures and Materials – Sensors and Smart Structures Technologies for Civil, Mechanical and Aerospace System, Proc. SPIE, Vol. 7292, 729218; DOI:10.1117/12.815510.