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The present investigation focuses on an observation regarding the initial
elastic response of a triangular geometrically and structurally
disordered lattice during medium-to-high strain rate loading. Namely: a
transition from the short-time modulus of elasticity to the long-time
one, which is not accompanied by the corresponding change of the
stiffness tensor. It is demonstrated that the difference between the two
moduli is, in the case of the homogeneous biaxial test simulations
performed herein, a consequence of the geometrical and structural
disorder ``quenched'' within the lattice. The investigation is performed
on the triangular lattice with the first-neighbor central interactions
under practically identical in-plane conditions over eight decades of
strain rate.
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