  It is shown that computer simulations can qualitatively reproduce
experiments, where a powder of cohesive, round, hard particles is periodically
deformed at constant volume. Two types of initial configurations are
considered: Uniaxially precompacted ballistic deposits and biaxially
precompacted DLA-clusters. Both initial configurations had the same volume
fraction, but due to the different precompaction procedure completely different
principal stresses. After a transient which lasts only less than a period, the
stresses follow the same periodic function, i.e. the powder forgot its history.
