  We propose a local reinforcement technique for lattices in the vicinity of a
stress-raiser such as a notch, in order to elevate the macroscopic strength and
ductility. A spatially non-uniform waviness distribution of sinusoidally-shaped
struts is assumed in the vicinity of the notch, and the sensitivity of
macroscopic tensile response to strut waviness distribution is studied by
finite element analysis. Optimized lattice structures are determined in order
to maximise the macroscopic tensile strength or ductility from these various
strut waviness distributions. Both hexagonal and triangular lattices are
studied as these geometries are representative of bending-dominated and
stretching-dominated lattices, respectively.
