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Numerical analysis of piezoelectric active repair in the presence of frictional contact conditions.

Alaimo A, Milazzo A, Orlando C, Messineo A - Sensors (Basel) (2013)

Bottom Line: In this paper, Boundary Element (BE) analyses performed on delaminated composite structures repaired by active piezoelectric patches are presented.A two-dimensional boundary integral formulation for piezoelectric solids based on the multi-domain technique to model the composite host damaged structures and the bonded piezoelectric patches is employed.The effect of the adhesive between the plies of piezoelectric bimorph devices on the electromechanical response is first pointed out for both sensing and actuating behavior.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Engineering and Architecture, University of Enna Kore, Cittadella Universitaria 94100, Enna, Italy. andrea.alaimo@unikore.it

ABSTRACT
The increasing development of smart materials, such as piezoelectric and shape memory alloys, has opened new opportunities for improving repair techniques. Particularly, active repairs, based on the converse piezoelectric effect, can increase the life of a structure by reducing the crack opening. A deep characterization of the electromechanical behavior of delaminated composite structures, actively repaired by piezoelectric patches, can be achieved by considering the adhesive layer between the host structure and the repair and by taking into account the frictional contact between the crack surfaces. In this paper, Boundary Element (BE) analyses performed on delaminated composite structures repaired by active piezoelectric patches are presented. A two-dimensional boundary integral formulation for piezoelectric solids based on the multi-domain technique to model the composite host damaged structures and the bonded piezoelectric patches is employed. An interface spring model is also implemented to take into account the finite stiffness of the bonding layers and to model the frictional contact between the delamination surfaces, by means of an iterative procedure. The effect of the adhesive between the plies of piezoelectric bimorph devices on the electromechanical response is first pointed out for both sensing and actuating behavior. Then, the effect of the frictional contact condition on the fracture mechanics behavior of actively repaired delaminated composite structures is investigated.

No MeSH data available.


Related in: MedlinePlus

(a) Punch on an elastic foundation configuration; (b) normalized contact traction components.
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f5-sensors-13-04390: (a) Punch on an elastic foundation configuration; (b) normalized contact traction components.

Mentions: Coulomb's friction modeling strategy as proposed in the present paper is validated through the analysis of a flat punch over an elastic foundation previously studied by Man [26]. The geometry, the boundary conditions, as well as the material properties of the two bodies and the friction coefficient are summarized in Figure 5(a). The results obtained are plotted in Figure 5(b) in terms of the normal and tangential tractions at the interface between the two bodies. Both traction components are normalized and, due to symmetry, are plotted along half the contact region. More particularly, the normal traction component has been normalized with respect to the applied load, Po, while the tangential one, with respect to μP0. As already highlighted by Man [26], at x1/L2 = 0.8, the transition point from stick to slip condition can be found, and good agreement with the results found in the literature is evidenced.


Numerical analysis of piezoelectric active repair in the presence of frictional contact conditions.

Alaimo A, Milazzo A, Orlando C, Messineo A - Sensors (Basel) (2013)

(a) Punch on an elastic foundation configuration; (b) normalized contact traction components.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3673090&req=5

f5-sensors-13-04390: (a) Punch on an elastic foundation configuration; (b) normalized contact traction components.
Mentions: Coulomb's friction modeling strategy as proposed in the present paper is validated through the analysis of a flat punch over an elastic foundation previously studied by Man [26]. The geometry, the boundary conditions, as well as the material properties of the two bodies and the friction coefficient are summarized in Figure 5(a). The results obtained are plotted in Figure 5(b) in terms of the normal and tangential tractions at the interface between the two bodies. Both traction components are normalized and, due to symmetry, are plotted along half the contact region. More particularly, the normal traction component has been normalized with respect to the applied load, Po, while the tangential one, with respect to μP0. As already highlighted by Man [26], at x1/L2 = 0.8, the transition point from stick to slip condition can be found, and good agreement with the results found in the literature is evidenced.

Bottom Line: In this paper, Boundary Element (BE) analyses performed on delaminated composite structures repaired by active piezoelectric patches are presented.A two-dimensional boundary integral formulation for piezoelectric solids based on the multi-domain technique to model the composite host damaged structures and the bonded piezoelectric patches is employed.The effect of the adhesive between the plies of piezoelectric bimorph devices on the electromechanical response is first pointed out for both sensing and actuating behavior.

View Article: PubMed Central - PubMed

Affiliation: Faculty of Engineering and Architecture, University of Enna Kore, Cittadella Universitaria 94100, Enna, Italy. andrea.alaimo@unikore.it

ABSTRACT
The increasing development of smart materials, such as piezoelectric and shape memory alloys, has opened new opportunities for improving repair techniques. Particularly, active repairs, based on the converse piezoelectric effect, can increase the life of a structure by reducing the crack opening. A deep characterization of the electromechanical behavior of delaminated composite structures, actively repaired by piezoelectric patches, can be achieved by considering the adhesive layer between the host structure and the repair and by taking into account the frictional contact between the crack surfaces. In this paper, Boundary Element (BE) analyses performed on delaminated composite structures repaired by active piezoelectric patches are presented. A two-dimensional boundary integral formulation for piezoelectric solids based on the multi-domain technique to model the composite host damaged structures and the bonded piezoelectric patches is employed. An interface spring model is also implemented to take into account the finite stiffness of the bonding layers and to model the frictional contact between the delamination surfaces, by means of an iterative procedure. The effect of the adhesive between the plies of piezoelectric bimorph devices on the electromechanical response is first pointed out for both sensing and actuating behavior. Then, the effect of the frictional contact condition on the fracture mechanics behavior of actively repaired delaminated composite structures is investigated.

No MeSH data available.


Related in: MedlinePlus