Abstract
A finite deformation/finite-element analysis is performed on the necking behaviour of laminated plates consisting of two materials with different work-hardening coefficients. The plates are subject to a prescribed uniform axial displacement at both ends. The plane strain condition is assumed and the J2-flow theory is adopted. The results obtained are as follows. (1)For the plate with shear free ends, the load-displacement curve before the necking point can be obtained by averaging the two stress-strain relations of both materials. The necking point can be predicted from the compound load-displacement curve. (2)For the plate with clamped ends, the necking behaviour is affected by the order of lamina location. The necking of the plate with the softer lamina located on the outside occurs more easily than that for the opposite location of laminas. The development of the unloaded region is also influenced by the lamina location. (3)A slight delamination has little effect on the load-displacement curve before the necking, although it has a considerable effect on the deformation behaviour after the necking occurs.
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