Plenty of oxidation etching pits are found on the surface of the specimen after the thermal fatiguetest, 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。
2
Through test analysis of the specimen (B-car), the fatigue damage theory is proven to be useful in the vehicle durability test.