Elastic Stability of Generally Laminated Composite Plates Including Hygrothermal Effects.
DELAWARE UNIV NEWARK DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
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A problem which has become increasingly important with the use of fiber-reinforced polymeric composite material systems in secondary and more recently in primary structural applications is the degradation in performance when exposed to an elevated hygrothermal environment. One aspect of this problem is the reduction in applied loading necessary to buckle a composite structure due to these hygrothermal effects. A general buckling theory is formulated which accounts for the hygrothermal effects due to moisture diffusion and heating on one and both surfaces in addition to transverse shear and normal deformation and the bending-extensional coupling exhibited by generally laminated composite plate. A parametric study is done for a symmetrically laminated, T3005208 graphite-epoxy plate with both simply supported and clamped boundary conditions for steady state and transient hygrothermal conditions to show the deleterious effects of an elevated hygrothermal environment on a laminated composite structure. Additionally, for typical laminates of GY70339 graphite-epoxy with clamped boundary conditions at elevated hygrothermal conditions, it is shown that inclusion of transverse shear and normal deformation is necessary for certain ab and ah aspect rations. Author
- Laminates and Composite Materials