Abstract
High-voltage busbars are important electrical components in today’s electric vehicle battery systems. Mechanical deformations in the event of a vehicle crash could lead to electrical busbar
failure and hazardous situations that pose a threat to people and surroundings. In order to ensure a safe application of busbars, this study investigated their mechanical behavior under high strain rate
loading using a split Hopkinson pressure bar. Two different types of high-voltage busbars, consisting of a polyamide 12 and a glass-fiber-reinforced (30%) polyamide 6 insulation layer, were tested.
Additionally, the test setup included a 1000 V electrical short circuit measurement to link the electrical with the mechanical failure. It was found that the polyamide 12 insulated busbars’ safety regarding insulation failure increases at high loading speed compared to quasi-static measurements. On the contrary, the fiber-reinforced polyamide 6 insulated busbar revealed highly brittle material behavior leading to reduced bearable loads and intrusions. Finally, the split Hopkinson pressure bar tests were
simulated. Existing material models for the thermoplastics were complemented with an optimized generalized incremental stress state-dependent model (GISSMO) with strain rate dependency. A
good agreement with the experimental behavior was achieved, although the absence of viscoelasticity in the underlying material models was notable.
failure and hazardous situations that pose a threat to people and surroundings. In order to ensure a safe application of busbars, this study investigated their mechanical behavior under high strain rate
loading using a split Hopkinson pressure bar. Two different types of high-voltage busbars, consisting of a polyamide 12 and a glass-fiber-reinforced (30%) polyamide 6 insulation layer, were tested.
Additionally, the test setup included a 1000 V electrical short circuit measurement to link the electrical with the mechanical failure. It was found that the polyamide 12 insulated busbars’ safety regarding insulation failure increases at high loading speed compared to quasi-static measurements. On the contrary, the fiber-reinforced polyamide 6 insulated busbar revealed highly brittle material behavior leading to reduced bearable loads and intrusions. Finally, the split Hopkinson pressure bar tests were
simulated. Existing material models for the thermoplastics were complemented with an optimized generalized incremental stress state-dependent model (GISSMO) with strain rate dependency. A
good agreement with the experimental behavior was achieved, although the absence of viscoelasticity in the underlying material models was notable.
| Translated title of the contribution | Zum dynamischen elektromechanischen Versagensverhalten von Hochspannungsstromschienen unter Verwendung eines Split Hopkinson Prüfstandes |
|---|---|
| Original language | English |
| Article number | 6320 |
| Journal | Materials |
| Volume | 14 |
| Issue number | 21 |
| DOIs | |
| Publication status | Published - 1 Nov 2021 |
Keywords
- busbar
- split Hopkinson pressure ba
- dynamic compressio
- crashworthines
- insulation failure
- battery safety
- numerical modeling
- thermoplastics
- Numerical modeling
- Split Hopkinson pressure bar
- Thermoplastics
- Battery safety
- Dynamic compression
- Insulation failure
- Busbar
- Crashworthiness
ASJC Scopus subject areas
- Condensed Matter Physics
- Materials Science(all)