The Study Of Interlaminar Stress In Piezoelectric Composite Cylindrical Laminated Shells Under Electric Thermal And Mechnical Loads

Composite materials offer the benefits of low weight, high strength and convenient machining and are corrosion-free and fatigue-resistant, Has gradually replace wood and metal alloy, and widely used in aerospace, automobile, electrical, construction, fitness equipment and other fields. Piezoelectric materials play an important role in the intelligent material system because of piezoelectric and converse piezoelectric effect used in manufacturing smart transducer parts. And attracted widespread attention at home and abroad except for its Poor mechanical properties, brittleness and unworkability. Piezoelectric composite materials which combine the advantages of piezoelectric and composite materials are widely used in the field of medical, sensing, measurement, control, etc. Such as using piezoelectric materials in making all kinds of sensitive devices and sensors and in making adaptive wing for spacecraft control.This article chiefly addresses theory analytical method and numerical simulation method of interlaminar stress of piezoelectric composite materials under electric, thermal and mechanical loads. End conditions may be simply supported or clamped. The first part is theoretical derivation and analytical method, using the orthogonal anisotropic elastic ity theory to obtain the general solution containing undetermined constants, where fiber reinforced directions and lay up conditions can be arbitrary. Then using stress and displacement continuity conditions between the adjacent layers, ins ide and outside surface pressure boundary conditions and Support boundary conditions at both ends to solve for the undetermined constants in the general form of solution. So can get the exact interlaminar stress solution of piezoelectric composite cylindrical shells. In addition to the piezoelectric effect, mainly focused on the influence of ±θ ply orientations and thermal effect. And predict the interlaminar stress under all kinds of combination conditions. Resolution shows piezoelectric effect can be used to decrease interlaminar stress.The second part mainly includes the programming, using Fortran programming to solve according to theoretical derivation, so can get stress and displacement curves under different circumstances, and do the corresponding analysis and discussing.The third part mainly inc ludes analogue simulation using ANSYS 14.5 to build finite element modelling and apply various boundary conditions and loads, so can get the interlaminar stress, and compare with the theoretical calculation results.In the final summarize the work and looking forward to the direction of further research.