Wu Zhanjun

Numerical Analysis of Buckling and Delamination Growth for Stiffened Composite Laminated Plates with Piezoelectric Actuators

The buckling and delamination propagation behavior in delaminated piezoelectric stiffened composite plates subjected to combined applied voltage and compressive loading are studied. The cohesive element for the non-linear finite element software ABAQUS is used to simulate the interface of the delamination region in the composite plates. The numerical simulation is conducted by using piezoelectric solid element and conventional shell element. The delamination propagation and the failure of stiffened composite plates are predicted by strength-based and energy-based criteria. The bucking control effect for the different buckling of piezoelectric stiffened composite plates with applied voltage was investigated, and the delamination propagation behavior of stiffened composite plates with piezoelectric actuators was studied. The results obtained by numerical analysis indicate that the appropriate control by piezoelectric actuators can retard local buckling of delaminated sub-laminates and prevent delamination growth effectively.

The Propagation of Torsional Guided Wave in Oil-Filledand Viscoelastic Coating Pipe Surrounded by Water

In this paper, the propagation of torsional guided wave in oil-filled and viscoelastic coating pipes surrounded with water loading has been investigated by numerical and experimental analysis. It is essential to understand how the guided waves travel in benthal pipes in order to monitor/inspect their health statues. Firstly, the paper describes dispersion characteristics for torsional wave by dispersion curves. Secondly, checks up the result of numerical analysis by a series of experimental study. And the effects of viscoelastic material on dispersion of guided wave have been elaborated without considering the shear action because the effect of oil and water are neglected. The result presented in this paper is useful for designing damage detection schemes of pipe-like structures.