Thermal Postbuckling of Laminates Containing Two Non-uniformly Distributed Fibers

摘要

This study presents the first thermal postbuckling analysis ofrncomposite laminates with two different non-uniformly distributed fibers in arnsingle lamina. A 54 degree-of-freedom high order triangular plate elementrnwas developed based on the Von Karman large deflection assumption. Thernformulation of the location dependent linear stiffness matrix, first-orderrnnonlinear stiffness matrix, second-order nonlinear stiffness matrix,rngeometrical stiffness matrix, and thermal loading vector was derived. Therneffects of hybrid fiber distribution on the thermal postbuckling behavior ofrncomposite laminates were discussed using the finite element method. Thernnumerical results reveal that the redistribution of two fibers can increaserncritical buckling temperature and decrease thermal postbucklingrndeformation. The deflection of the plate is larger for the plate subjected tornhigher temperature rise and temperature gradient. The stiffening effect ofrnfiber redistribution is more obvious for the laminate with higher volumernfraction index and clamped edges.