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A numerically simulated network of randomly occupied sites connected by central forces and bond-bending couplings, whose the site concentration is slightly higher than the percolation threshold, is submitted to an external stretch. The optical diffraction pattern of the relaxed network is experimentally and analytically studied. In real space, regions at the boundary are shifted without being deformed, while most of the internal regions are rotated by some angles. Internal regions, bounded by pivots as usual in percolation theory are homogeneously rotated. These rotations are optically detected in reciprocal space and compared with the predictions of the theoretical model. Most of the stretching occurs by means of nearly free, independent rotations, without energy expense and thus with a very low bulk modulus

Optical Diffraction of Stretched Lacunary Networks with Central Forces and Bond BendingCouplings