The cross-section of the fan shaft is quite strange; let’s take a look together
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Let’s take a look together – is it strange, this cross-section?
There’s nothing strange about this; finding the cause is the top priority, otherwise it will continue. For reference.
Fracture at the diameter change is not surprising; it’s a typical case in academic literature – read more books and you’ll come across many such examples.
Thanks for sharing, coming in to learn a bit*
Isn’t it just a break in the position of the key, whether there’s a change in diameter or not?
It’s not surprising at all – the thread’s withdrawal groove is at 90 degrees, with no rounded transitions. Typically caused by stress concentration.
1. What type of fan? 2. Is it from the original supplier? Is the heat treatment proper? 3. What is the operating load? Operation status before 4
The shaft lacks sufficient strength; there is an issue with the material
The stress fatigue cracks at the shaft shoulder caused by fan vibration lead to brittle fracture of the shaft as the cracks continue to propagate. The effect of vibration should be eliminated
It’s not surprising that the material of the shaft lacks sufficient toughness, and the tool withdrawal groove wasn’t rounded during design, resulting in stress concentration.