6533b836fe1ef96bd12a09d2
RESEARCH PRODUCT
Granular chains for the assessment of thermal stress in slender structures
Emma La Malfa RibollaPiervincenzo RizzoAbdollah Bagherisubject
Highly nonlinear solitary waveMaterials scienceNeutral temperaturebusiness.industryElectronic Optical and Magnetic MaterialComputer Science Applications1707 Computer Vision and Pattern RecognitionCondensed Matter PhysicNeutral temperatureNull (physics)Applied MathematicStress (mechanics)Nonlinear systemOpticsCompressive strengthThermal bucklingNondestructive testingDiscrete particle modelCoupling (piping)Nondestructive testingElectrical and Electronic EngineeringComposite materialbusinessBeam (structure)L-shaped chaindescription
Slender beams subjected to compressive stress are common in civil and mechanical engineering. The rapid in-situ measurement of this stress may prevent structural anomalies. In this paper, we describe the coupling mechanism between highly nonlinear solitary waves (HNSWs) propagating along an L-shaped granular system and a beam in contact with the granular medium. We evaluate the use of HNSWs as a tool to measure stress in thermally loaded structures and to estimate the neutral temperature, i.e. the temperature at which this stress is null. We investigated numerically and experimentally one and two L-shaped chains of spherical particles in contact with a prismatic beam subjected to heat. We found that certain features of the solitary waves are affected by the beam's stress. In the future, these findings may help developing a novel sensing system for the nondestructive prediction of neutral temperature and thermal buckling.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2015-03-27 | SPIE Proceedings |