Abstract
Potential energy theorems and associated bounds are derived for composite plates within the kinematical assumptions usually attributed to von Karman. Material properties are assumed Green elastic but otherwise unspecified. A general expression is derived for the energy released at progressing delamination in plates consisting of an arbitrary distribution of layers of different material properties. The advantages of different versions of the energy release rate expression based on dynamic or kinematic variables are discussed with application in mind. In particular the efficiency of different analytical and numerical means, including classical Rayleigh-Ritz and finite element methods, is investigated in detail for a delaminated member of circular shape and under transverse pressure. In addition to general conclusions drawn for this test case, results are obtained which have a direct practical significance relating to the so-called blister test used to determine adhesive and cohesive material properties.
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