Entwicklung von Zähmodifikatoren für die Tieftemperaturanwendung von Epoxidharzsystemen am Beispiel von CFK-Wasserstoffspeichertanks

Project Title
Development of toughening modifiers for the low-temperature application of epoxy resin systems using the example of CFRP hydrogen storage tanks.
Principal Investigator
Project Abstract
The shift in mobility toward greater sustainability in terms of drive technology is bringing about a change in the fuel to be used. In this context, "green" hydrogen plays a key role as an energy carrier both in the automotive sector and in rail-based transportation. An important prerequisite is the safe and loss-free storage of hydrogen in storage tanks, which, in order to save weight, must be made not of steel but of CFRP.
When CFRP is used as the structural material, however, an additional metallic permeation barrier becomes necessary. The "liners" used for this purpose are characterized by a very good permeation barrier effect, although joining and adhesion of the liner to the fiber composite are often problematic. Other metallization processes, such as thermal spraying or electrodeposition, either have a lower barrier effect or are costly to process (electroplating). Currently, the properties of the metallic liner determine the service life of the H2 tank. The requirements in the mobility sector, on the other hand, are demanding and range from 35,000 to 50,000 cycles (fatigue). With many steels or titanium there is also the risk of hydrogen embrittlement and cracking. The aim is therefore to develop a solution without a metallic liner.
In order to prevent losses of hydrogen through migration of the gas through the tank walls as far as possible, it is essential to use a matrix material for the fiber composite that, due to its own high toughness, has intrinsically little tendency to form microcracks and has a high impact strength in the event of impact loads, e.g. from an accident.
The aim of the research is to develop and test suitable tougheners for low-temperature toughening and simultaneous high barrier effect of epoxy resin systems using the example of CFRP hydrogen storage tanks. In the context of this development work, computational science methods (data evaluation by means of neural networks) are also being tested as a forward-looking extension to proven procedures.

Further keywords: CFRP, Thin-Ply, cryogenic temperatures, FEM, experiments

Translated with www.DeepL.com/Translator (free version)