We have studied experimentally and theoretically the response of randomly folded hyperelastic and elastoplastic sheets on the uniaxial compression loading and the statistical properties of crumpling networks. The results of these studies reveal that the mechanical behavior of randomly folded sheets in the one-dimensional stress state is governed by the shape dependence of the crumpling network entropy. Following up on the original ideas by Edwards for granular materials, we derive-an explicit force-compression relationship which precisely fits the experimental data for randomly folded matter. Experimental data also, indicate that the entropic rigidity modulus scales as the power of the mass density of the folded ball with universal scaling exponent.
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