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Section 4.12: Rigid Body Up Chapter 4: Materials Subsection 4.13.1: Contraction in Mixtures of Uncoupled Materials

## 4.13 Active Contraction

Active contraction materials may be used to impose a (typically) contractile stress within a solid material, by incorporating the contraction material within a solid mixture. The total stress in the solid mixture is simply , where is the solid stress (due to strain and strain history), and is the active contractile stress. The calculation of the contractile stress is the same, wether the solid mixture consists of uncoupled or unconstrained materials.
Section 4.12: Rigid Body Up Chapter 4: Materials Subsection 4.13.1: Contraction in Mixtures of Uncoupled Materials