STRESS AND FAILURE PREDICTION FOR THE DRYING, TEMPERING, AND COOLING OF EXTRUDED DURUM SEMOLINA

This work presents a method to predict the stress and breakage that is caused by the drying of hygroscopic materials: Stresses were predicted for a viscoelastic cylinder with the properties of extruded durum semolina, or pasta noodles. The stresses were calculated as functions of the transient moisture and temperature gradients in the material which were predicted for the combined processes of drying, tempering, and cooling. The time and radial position of failure were predicted based on failure data for extruded semolina.