  This paper deals with the theoretical and numerical analysis of dynamic
fracture of dissimilar chain consisting of masses lined by springs. Such a
structure exhibits quite different dynamic properties in comparison with a
symmetrical uniform structure when dynamic properties are in question. Among
other to stay in a balance, the external force applied to the system should not
be the same but depend on the seed of the crack propagating as the result of
the force action. Moreover, in the supersonic regime there is a bang gap in the
velocity where the crack of that speed cannot propagate at all. However, having
such theoretical prediction, a question still remains where and how those
dynamical regimes can be achieved in real structure. We answering on this
question by providing tailored numerical simulations demonstrating that various
predicted steady-state regimes can be reached after rather short transient
states. Among other, we analise how position of applied loading influence the
result.
