Creases in soft tissues generated by growth
School of Engineering and Applied Sciences, Kavli Institute for Nanobio Science and Technology, Harvard University - Cambridge, MA 02138, USA
Accepted: 2 August 2011
Soft tissues growing under constraint often form creases. We adopt the model of growth that factors the deformation gradient into a growth tensor and an elastic deformation tensor, and show that the critical conditions for the onset of creases take a remarkably simple form. The critical conditions are illustrated with tubes of tissues growing either inside a rigid shell or outside a rigid core. By comparing the critical conditions for the onset of wrinkles, we show that the creases are the preferred type of instability. Furthermore, deep creases in a tube are simulated by using the finite-element method, and the number of creases in the tube is estimated by minimizing the free energy.
PACS: 46.32.+x – Static buckling and instability / 87.16.A- – Theory, modeling, and simulations / 87.17.Ee – Growth and division
© EPLA, 2011