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Measuring axial stress in thick structures using highly nonlinear solitary waves (Conference Presentation)
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Paper Abstract

This article presents a nondestructive evaluation (NDE) method to infer the axial stress in thick beams with the aim to extent the methodology to continuous welded rails. The method relies on the propagation of highly nonlinear solitary waves generated at one end of a chain of spherical particles in contact with the beam to be evaluated. The opposite end of the chain is in contact with the beam to be evaluated. Here the waves are reflected back to chain and the hypothesis is that the axial stress influences the amplitude and speed of the reflected waves. To verify this hypothesis a general finite element model of thermally stressed beams was developed and coupled to a discrete particle model able to predict the propagation of the waves along a L-shaped granular medium. The models were validated experimentally. The hypothesis was proven valid by both the numerical and the experimental results. In the future, these findings may be used to refine a NDE method to assess stress in columns, to infer the neutral temperature of continuous welded rails, and to prevent thermal buckling of critical structures.

Paper Details

Date Published: 1 April 2019
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Proc. SPIE 10972, Health Monitoring of Structural and Biological Systems XIII, 109721E (1 April 2019); doi: 10.1117/12.2514059
Show Author Affiliations
Amir Nasrollahi, Univ. of Pittsburgh (United States)
Piervincenzo Rizzo, Univ. of Pittsburgh (United States)


Published in SPIE Proceedings Vol. 10972:
Health Monitoring of Structural and Biological Systems XIII
Paul Fromme, Editor(s)

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