Abstract
A summary of computer simulations of flux pinning and flux creep in two dimensional systems is given. A softening of the shear modulus due to the random potential is observed. This phenomenon is treated in weak disorder perturbation theory. One can calculate the Labusch parameter directly from the disordered Hamiltonian. However, the perturbation theory turns out to be ill behaved. This probably indicates that the perturbed lattice configuration is non reachable within perturbation theory. This point is also supported by recent simulations which find that the displacements of the vortices change discontinuously as function of the strength of the random potential.
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