A three-dimensional problem in the theory of elasticity of a stressed
solid in a domain of small thickness (diameter) is converted into a pr
oblem in the theory of membranes (strings). The averaged problems obta
ined enable one to describe membranes (strings) with inhomogeneities o
f a size comparable with their thickness. The problems are analysed us
ing the asymptotic method of averaging. (C) 1998 Elsevier Science Ltd.
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