  Armchair graphene nanoribbons, when forming a superlattice, can be classified
in different topological phases, with or without edge states. By means of
tight-binding and classical molecular dynamics (MD) simulations, we studied the
electronic and mechanical properties of some of these superlattices. MD shows
that fracture in modulated superlattices is brittle, as for unmodulated
ribbons, and that occurs at the thinner regions, with staggered superlattices
achieving a larger fracture strain. We found a general mechanism to induce a
topological transition with strain, related to the electronic properties of
each segment of the superlattice, and by studying the sublattice polarization
we were able to characterize the transition and the response of these states to
the strain. For the cases studied in detail here, the topological transition
occurred at $\sim$3-5 \% strain, well below the fracture strain. The
topological states of the superlattice -- if present -- are robust to strain
even close to fracture. Unlike the zero-energy edge states found in the zig-zag
edges of graphene nanoribbons, the superlattice states shows signatures of
being particularly insensitive to disorder, even in real space.
