Propagation of a crack through inhomogeneous media is considered in the var
iational formulation, whereby the path corresponding to the extremum of ene
rgy release during fracture is sought. A non-linear differential equation i
s obtained for the crack trajectory in an inhomogeneous medium subjected to
specified tensile loading. A linearized form of this equation is investiga
ted in order to characterise the crack propagation in media with different
effective characteristics.