Fan failure and yield strength

In summary, the conversation discusses the potential failure of an aluminium impeller rotating at 7500 rpm and powered by a 355 kW motor, striking against a stationary 10 mm thick MS plate welded at both ends with a length of 350 mm and width of 200 mm. It is initially thought that the blade of the impeller will fail, but upon calculating the impact load due to the rpm, it is determined to be around 650 MPa, which is higher than the yield strength of MS (410 MPa). The conversation ends with a suggestion to post a cross section diagram in a new thread for further discussion.
  • #1
GillJatt
1
0
What will fail if the aluminium impeller rotating at 7500 rpm and powered by 355 kw motor strikes against the stationary 10 mm thick ms plate welded at both the ends having length of 350 and width 200 mm and impeller blade is 12 mm thick.

I am confused in first glance we think that blade will fail of aluminum but when we calculate the impact load due to rpm it will be around 650 mpa where as the yeild stregth of ms is 410mpa


please help me & suggest what will be the case?
 
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  • #2


Good evening GillJatt and welcome to Physics Forums.

Perhaps if you post a cross section diagram in the new thread you will get more takers.

go well
 
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1. What causes fan failure?

Fan failure can be caused by a variety of factors, including wear and tear on the fan's components, inadequate maintenance, and external factors such as extreme weather conditions or power surges. It can also be due to manufacturing defects or faulty installation.

2. How can I prevent fan failure?

Regular maintenance and cleaning of the fan can help prevent failure. It is also important to ensure proper installation and use the fan within its designated capacity and operating conditions. Monitoring the fan's performance and addressing any issues promptly can also help prevent failure.

3. What is the difference between static yield strength and dynamic yield strength?

Static yield strength refers to the maximum amount of stress a material can withstand before it permanently deforms or breaks when it is subjected to a constant load. Dynamic yield strength, on the other hand, refers to the maximum amount of stress a material can withstand when it is subjected to varying loads or forces over time.

4. How is yield strength determined for a fan?

Yield strength for a fan is typically determined through destructive testing, where the fan is subjected to increasing loads until it reaches its yield point. The load at which the fan deforms or breaks is then recorded as the yield strength. It can also be calculated through mathematical models and simulations.

5. Can a fan still function with reduced yield strength?

It depends on the severity of the reduction in yield strength and the operating conditions. In some cases, a fan may still function with reduced yield strength, but it may have a shorter lifespan and be more prone to failure. It is important to monitor and address any changes in the fan's yield strength to ensure safe and efficient operation.

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