Using piezoelectric patches the stress concentration around a hole on a plate under tension is reduced and controlled. To attain the reduction in stress two placements for piezoelectric patches is investigated. The first location is top/bottom of the hole with compression induced strain and the second is left/right of the hole with tension induced strains to control the stress flow. The result for two above condition is presented for host plate and piezoelectric patches and by comparing the results the advantages of locating the piezoelectric patches to control the stress flow in the host plate is investigated. The results show that locating the piezoelectric patches at left/right of the hole, to control the stress flow and stress concentration is more effective than locating them at the top/bottom of the hole. پرونده مقاله

This paper presents an analytical solution for response of a piezoelectric hollow cylinder under two-dimensional electro thermo mechanical fields. The solution is based on a direct method and the Navier equations were solved using the complex Fourier series. The advantage of this method is its generality and from mathematical point of view, any type of the thermo mechanical and electrical boundary conditions can be considered without any restrictions. The thermo mechanical and electrical displacements are assumed that vary in radial and circumferential directions. Finally, three examples were considered to confirm the results and investigate the effect of in-phase and opposite-phase electro thermo mechanical boundary loads on two-dimensional electro thermo mechanical behavior of piezoelectric hollow cylinder. The results are compared with the previous work and FEM analysis. The main result of this study is that, by applying a proper distribution of thermal, electrical and mechanical fields, the distributions of electric and mechanical displacement, thermal and mechanical stresses can be controlled. پرونده مقاله