Speaker
Description
The presented complete simulation chain connects the simulation of the reactive injection molding process with the structural mechanical properties based on computational homogenization.
The simulation of the foam expansion is carried out macroscopically with ITWMs FOAM solver. The rheology is calibrated in terms of rising pipe experiments for different pipe diameters and reaction masses, [1].
The results of these FOAM simulations are amongst others material densities and pore size distributions. These quantities are then applied to generate so-called representative volume elements (RVE) and the effective mechanical properties are computed in ITWMs solver FeelMath, [2],[3]. The required microscopic material properties of the PUR foam are calibrated in terms of compression tests on homogenous foam samples.
Finally, an inhomogeneous beam like structure is simulated on the macroscale by using the effective foam properties and the results are compared to corresponding experiments.
Therefore, the established method yields a Digital Twin of the PUR foam component and is applicable to more complex foam structures.
[1] Schäfer, K., D. Nestler, J. Tröltzsch, I. Ireka, D. Niedziela, K. Steiner, and L. Kroll. “Numerical Studies of the Viscosity of Reacting Polyurethane Foam with Experimental Validation,” 2020. https://doi.org/10.3390/polym12010105
[2] Kabel, M., and H. Andrä. “Fast Numerical Computation of Precise Bounds of Effective Elastic Moduli.” Fraunhofer ITWM, 2013. https://doi.org/10.24406/publica-fhg-296341
[3] Fraunhofer ITWM: FeelMath, www.itwm.fraunhofer.de/feelmath, Accessed: 20.12.2024
