Experimental Analysis on Residual Performance of Used 70 MPa Type IV Composite Pressure Vessels
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This paper was aimed to study residual performance of five 70 MPa type IV hydrogen composite pressure vessels that were employed in vehicles with same driving distance through a series of experiments. Firstly, external and internal visual inspections were performed to evaluate the damage status of hydrogen composite pressure vessels. Then the nonmetallic liner performance tests of one vessel were carried out including crystallinity test, hardness test, and tensile test. Besides, hydraulic fatigue test and hydraulic burst test for the remaining four vessels were conducted to evaluate residual strength. Experimental results show that the nonmetallic liner performance differs in different regions and temperature has an important influence on liner mechanical performance. The comparison between the results of direct burst tests and post-fatigue burst tests shows that long-term fatigue cycles lead to a reduction in burst pressure, but the effect is not significant by using hydraulic fatigue cycles in the current tests.
KeywordsHydrogen composite pressure vessels Polyamide-6 Liner performance Residual strength
All authors wish to express their sincere thanks to the support of the National Key Research and Development Program of China (No. 2017YFC0805601). We also thank Jianfang Tan and Dr. Peng Jiang for helping with tests.
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