The influence of low temperature and hydrogen on the failure modes of fiberglass composite material under steady-state and cyclic loads
This study was conducted to describe the failure modes of fiberglass-reinforced polymers at room temperature and low temperatures by means of appropriate experiments.
The failure modes of fiberglass-reinforced polymers at room temperature are influenced by stress corrosion cracking. At 77 K, when these processes are frozen, the fracture stress of unidirectional fiberglass-reinforced polymer is 50 % higher than it is at room temperature. After a quasi steady-state tensile test the specimen is nearly fragmented as a result of the immense elongation at fracture.
Experiments on composites wound crosswise indicate that the material, at 77 K, behaves nearly linearly elastic up to the point of fracture. At room temperature, however, visco-elastic behavior of the polymer matrix dominates.
In general, unidirectional and cross-wound composites are degraded strongly in a vibration test.
The influence of hydrogen on unidirectional fiberglass-reinforced polymer became apparent only in fatigue tests. After three months of storage of the samples in gaseous hydrogen at 80 °C, the subsequent vibration test at 77 K showed an increase by 30 % in fatigue strength compared to samples not stored in this way.
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Free keywords:
Wear, Wear Smulation, Span Time Prediction, Multiscale Approach, Tribology, PTFE, Polytetrafluoroethylene, Sealing Technology, Shaft Seal Ring
Institute / chair:
Fakultät für Maschinenbau der Universität Karlsruhe (TH)
Language:
German
Technical consultant for expert services:
Prof. Dr. rer. nat. Dietrich Munz (Betreuer),
Prof. Dr. rer. nat. Günther Hartwig
Publication year:
2000
Provider:
Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de
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