Stress analyses of a smart composite pipe joint integrated with piezoelectric composite layers under torsion loading

Abstract

In order to improve the joint failure strength, an adhesively bonded smart composite pipe joint system has been developed by integrating electromechanical coupling piezoelectric layers with the connection coupler. It has been validated that the integrated piezoelectric ceramic layers can smartly reduce stress concentration in the adhesive layer bond-line under bending or axial tension loads. In this study, piezoelectric particle/fiber reinforced polymer composite was utilized to construct adhesively bonded smart composite pipe joint systems, in order to overcome the brittle characteristic of the piezoelectric ceramic layers and to facilitate joint construction. Since torsion is one of the dominating loading conditions in practice, the behavior of the newly developed smart pipe joint system subjected to torsion loading was investigated in-detail to evaluate the effect of the integrated piezoelectric reinforced polymer composite layer on the joint performance. Firstly, based on the first-order shear deformation theory, the fundamental equations with relevant boundary and continuity conditions were developed to theoretically model the smart pipe joint system subjected to torsion loading. Further, the analytical solutions for the mid-plane displacements and the shear and peel stresses in the adhesive layer were obtained by using the Levy solution and the state-space method. Finally, some numerical examples were presented to evaluate the detailed effect of the stacking sequence and thickness of the integrated composite piezoelectric layers in the connection coupler on reducing the stress concentration in the adhesive layer; the effect of the applied electric fields on shear and peel stresses in the adhesive layer was also illustrated.

Survey of Active Structural Control and Repair Using Piezoelectric Patches

“…The piezoelectric layers, on the other hand, were implemented by Cheng et al [60][61][62] so that there is a gain in the reduction of stress effect concentration on a pipe system made up of adhesive composite materials. The piezoelectric layers were employed as sensors/actuators, and the pipe system was subjected to a load characterized by an axial tensile, bending, and torsion.…”

Monoharmonic approximation in the vibration analysis of a sandwich beam containing piezoelectric layers under mechanical or electrical loading

“…Eqs. (8) are significantly nonlinear and have to be solved numerically. As a result, the time dependent beam response can be found for both, the transient and the steady-state stages of vibration.…”

“…As we concerned with the problem for the sandwich beam described in Subsection 2.2, the complex-value analogue of the system given by Eqs. (8) can be written asw…”

“…In particular, distributed piezoelectric actuators/sensors have received considerable attention due to their higher potential applicability for the vibration control in various industrial and research areas [8][9][10]. These materials, incorporated into conventional structures, can generate control forces and moments within structural members according to the applied voltage.…”

Cohesive zone model based analytical solutions for adhesively bonded pipe joints under torsional loading

“…Zou and Taheri (2006) derived a model for the adhesively bonded sandwich pipe joints under torsion based on the general composite shell theory. Cheng and Li (2008) conducted stress analyses of a smart composite pipe joint integrated with piezoelectric composite layers under torsion loading, in order to evaluate the effect of the integrated piezoelectric reinforced polymer composite layer on the joint performance.…”