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This paper deals with the theoretical and numerical analysis of dynamicfracture of dissimilar chain consisting of masses lined by springs. Such astructure exhibits quite different dynamic properties in comparison with asymmetrical uniform structure when dynamic properties are in question. Amongother to stay in a balance, the external force applied to the system should notbe the same but depend on the seed of the crack propagating as the result ofthe force action. Moreover, in the supersonic regime there is a bang gap in thevelocity where the crack of that speed cannot propagate at all. However, havingsuch theoretical prediction, a question still remains where and how thosedynamical regimes can be achieved in real structure. We answering on thisquestion by providing tailored numerical simulations demonstrating that variouspredicted steady-state regimes can be reached after rather short transientstates. Among other, we analise how position of applied loading influence theresult.

Dynamic fracture of a discrete dissimilar chain: transient, subsonic and supersonic regimes