Simulation of three-dimensional cracks

We describe a method for simulating the process of cracking based on a 3D physical model. Cracks appear when the stress caused by internal or external force exceeds the tolerable amount. We applied a spring network model to a simulation of cracks that appear on drying clay. Clay contracts, or shrinks, as it dries. Because the surface part dries more quickly than the interior, the stretching stress acts on the surface part, generating cracks. The process of drying changes physical characteristics such as stiffness and maximum strain. Our model introduces the properties of clay by defining these parameters as functions of time on the basis of measurement.