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Interlaminar Stress Analysis of Laminated Piezo-composite Structure
Huang Bin(황빈),Heung Soo Kim(김흥수) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
A stress function based method is proposed to analyze the interlaminar stresses at the free edge of a piezo-bonded composite laminated structure. Two piezoelectric actuators are symmetrically surface bonded on composite laminate. Same electric fields are applied to the two symmetric piezoelectric actuators which can generate induced strain, resulting in pure extension on the laminated plate. The stresses that satisfy the traction-free boundary conditions at the free edge and at the top and bottom surfaces of the laminate are obtained by using the complementary virtual work principle. Cross-ply laminates are analyzed. To verify the proposed method, the stress concentrations predicted by the present method are compared with those analyzed by the finite element method. The results provide that the stress function based analysis of piezo-bonded laminated composite structure is an efficient and accurate method for the initial design stage of piezo-composite structure.
Control of Interlaminar Stresses in Laminated Composite Structures Using Piezoelectric Actuator
Bin Huang(황빈),Heung Soo Kim(김흥수) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
The use of piezoelectric actuators for the control of interlaminar stresses in composite laminates is numerically investigated by using stress function based approach. The piezoelectric actuators are surface bonded in order to compensate the stresses generated by mechanical loadings with opposite sign. The mathematical model is derived using the principle of complementary virtual work along with the traction free boundary conditions at the free edge and at the top and bottom surfaces. Various layup configurations are considered to verify the proposed approach. The results show that with applying appropriate electric fields, the interlaminar stresses can be reduced down significantly. This phenomenon implies that piezoelectric actuators have great potential in controlling the interlaminar stresses in laminated composite structures. Our proposed stress function based approach is an efficient method in analyzing the interlaminar stresses in laminated composite structures.