Figure 7.

Area growth of skin for stretch-driven transversely isotropic growth, ${\mathit{F}}^{\mathrm{g}}=\sqrt{{\vartheta }^{\mathrm{g}}}\mathit{I}+[1-\sqrt{{\vartheta }^{\mathrm{g}}}]\mathit{n}\otimes \mathit{n}$ with ${\dot{\vartheta }}^{\mathrm{g}}=k_{\vartheta }[{\overline{I}}_1^{C^{\mathrm{e}}}-{\overline{I}}_4^{C^{\mathrm{e}}}]/[2{\vartheta }^{\mathrm{g}}]$, according to equations (69) and (73.2). Photograph of a tissue expander to induce controlled in situ skin growth for defect correction in reconstructive surgery, left, reprinted with permission, Mentor Worldwide LLC [17]. Computational simulation of transversely isotropic area growth, right, predicts area growth in response to controlled mechanical overstretch during tissue expansion [18].