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.
The achievement and the maintenance of dental implant stability are prerequisites for the long-term success of the
osseointegration process. Since implant stability occurs at different stages, it is clinically required to monitor an implant
over time, i.e. between the surgery and the placement of the artificial tooth. In this framework, non-invasive tests able to
assess the degree of osseointegration are necessary. In this paper, the electromechanical impedance (EMI) method is
proposed to monitor the stability of dental implants. A 3D finite element model of a piezoceramic transducer (PZT)
bonded to a dental implant placed into the bone was created, considering the presence of a bone-implant interface
subjected to Young’s modulus change. The numerical model was validated experimentally by testing bovine bone
samples. The EMI response of a PZT, bonded to the abutment screwed to implants inserted to the bone, was measured.
To simulate the osseointegration process a pulp canal sealer was used to secure the implant to the bone. It was found that
the PZT’s admittance is sensitive to the stiffness variation of the bone-implant interface. The results show that EMIbased
method is able (i) to evaluate the material properties around the implant, and (ii) to promote a novel non-invasive
monitoring of dental implant surgical procedure.
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