The elastic properties of paper materials have been predicted by a micromechanics model of a ribbon-like nonwoven structure. The present model extends the previous linear elastic theory to incorporate nonlinear elastic and deformation theory plastic behavior. The theory incorporates different nonlinear or plastic parameters of fibers that are loaded in tension and compression. The theory is used to develop a computer simulation of the uniaxial straining of a strip of paper. Theoretical results are compared with experiments conducted on two classes of paper materials.

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