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Axial stress Pzz and nominal shear modulus G of collagen networks as a function of axial strain (ε = λ − 1). Results predicted by the (a) affine (εs = 0.001), (b) three-chain (εs = 0.0065), (c) eight-chain (εs = 0.53) and (d) micro-sphere models (εs = 0.47), as well as the corresponding experimental results of van Oosten et al. are shown. Note that εs = λs − 1 denotes the critical strain for fibre stiffening (obtained by data fitting).
