Fan failure and yield strength

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SUMMARY

The discussion centers on the failure analysis of an aluminum impeller rotating at 7500 RPM, powered by a 355 kW motor, when it strikes a stationary 10 mm thick mild steel (MS) plate. Calculations indicate that the impact load on the impeller reaches approximately 650 MPa, exceeding the yield strength of mild steel, which is 410 MPa. This suggests that the aluminum impeller is likely to fail upon impact, despite initial assumptions that the aluminum would be the weaker material.

PREREQUISITES
  • Understanding of material yield strength, specifically for aluminum and mild steel.
  • Knowledge of impact load calculations and their implications on material failure.
  • Familiarity with rotational dynamics and the effects of RPM on mechanical components.
  • Basic principles of mechanical engineering related to material properties and failure modes.
NEXT STEPS
  • Research the impact load calculations for rotating machinery.
  • Study the yield strength and failure modes of aluminum alloys versus mild steel.
  • Learn about the effects of RPM on material stress and strain.
  • Explore case studies on mechanical failures in similar applications.
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Mechanical engineers, materials scientists, and anyone involved in the design and analysis of rotating machinery and components.

GillJatt
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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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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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