Funding period: Mar 2017 to Sep 2021

Researchers: Stefan Bergmann, Christoph Kammer

Wrap-up

Keywords: material model, homogenisation, honeycomb structure, polypropylene, viscoelasticity

Background:
In the production of thermoplastically formed honeycomb structures, simple standard material equations from various FEM systems fail. Differences to real experiments occur. Furthermore, each honeycomb of the structure has to be constructed, which takes a lot of time.

Objective:
Creation of a material model that makes it possible to build the structure more simply and still specify the stresses correctly. 

Methods:
Homogenisation of the structure; spring-damper substitute model; use of an RVE; transfer of the data into a unit cell 

Results:
A unit cell was developed which simulates the behaviour of a honeycomb structure. However, not for the application that was needed.

Conclusions:
An extension of the work would have to take place as well as a complete check for error causes in order to exclude the individual possible error sources.

Originality:
A test environment was created. The determined stress values were homogenised and checked for correctness. Furthermore, the data was used in a unit cell to determine the comparison with the normal structure.