Bionisch inspirierte Integralschaumstrukturen mit gradiertem Strukturaufbau und lokal veränderlichen Nachgiebigkeiten für neuartige Sicherheitssysteme in Leichtbauweise: Strukturaufklärung - Simulation - Technologieentwicklung
In the context of damage behavior of composite materials, the use of non-destructive testing (NDT) is of vital importance to fully understand the damage phenomenology. Within current investigations, a novel in-situ computer tomographic (CT) machine is used to perform compression tests on closed-cell polymeric foams with different foam densities. Strain mapping tools are developed to detect local cell wall deformations, such as bending, buckling and stretching. The initiation of cracks and their growth, influenced by the cellular structure is a major part of these studies. Following the comprehensive analysis of the foam structure, the implementation of an implicit model for Finite Element Method (FEM) simulation is developed based on CT scans. With the introduction of a phase field function, the equations to describe the non-linear deformation behavior are effectively solved for the complex foam structure, which helps to reduce computationally intensive calculations. Beyond that, the results gained by the in-situ CT device help to adapt and complete the currently available elastic deformation models and therefore offer the opportunity to predict the material behavior for various load scenarios of polymeric foams.
Projektlaufzeit: 04/2014 - 05/2016
Drittmittelgeber: Support-the-best, TU Dresden