家轿后减振器活塞杆在进行旋转弯曲疲劳试验时出现早期断裂。
The piston rod of family sedan's rear snubber fractured duringearlier stage of rotary bending fatigue test.
结果表明，该轴断裂是由于轴表面存在焊接缺陷，在旋转弯曲应力作用下产生低应力疲劳开裂。
The results showed that the weld detects on the surface of the axle was the reason to cause low stress fatigue under rotation bending stress which finally lead to the fatigue cracks on the axle.
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