Abstract
We are studying the Leak-before-break (LBB) test, which is an important test for the safety performance verification of CNG-II bottles, and it is a necessary link for new product identification. We ruptured during the LBB test of a CNG-II gas cylinder. Through the chemical composition analysis, metallographic observation, mechanical performance test, scanning electron microscope and other tests of the failed gas cylinder, we found that the cylinder failure was due to the curved part. There are oxide slag inclusions. Under the fatigue test under the action of alternating load, slag inclusions are used as the fatigue source, which accelerates the crack growth and eventually causes the cylinder to fail.
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