The results indicate that increasing the compression of O-ring can improve the sealing performance, simultaneously, can make it prone to crack ;

结果表明：增加压缩量可以提高O形圈的密封性，同时也使其容易出现裂纹；

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Plenty of oxidation etching pits are found on the surface of the specimen after the thermal fatigue test, and the surface principal crack is prone to propagate through these etching pits.

实验结果发现，试样表面出现大量的氧化腐蚀坑，表面主裂纹优先通过这些腐蚀坑扩展。

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