Patch load on stiffened panel ?

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SUMMARY

The discussion centers on analyzing the stress in a stiffened panel subjected to a uniform patch load with fixed and pinned edges. The user attempted to apply Roark’s formulas but found them unsuitable for this scenario, as finite element analysis (FEA) yielded significantly different results. The conversation highlights the limitations of hand-calculation methods for complex plate problems and emphasizes the reliability of FEA for accurate stress analysis in such cases.

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  • Understanding of stiffened panel mechanics
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  • Knowledge of finite element analysis (FEA) principles
  • Basic concepts of load distribution on structural elements
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Structural engineers, mechanical engineers, and anyone involved in the design and analysis of stiffened panels under load conditions.

XaeroR35
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I need help analyzing a load scenario. I have a stiffened panel with fixed and pinned edges. There are fairly sturdy stiffeners equally spaced below the panel.

There is a uniform patch load (pressure) that can be applied at any point around the panel. I need to determine the resulting stress in the plate. I have tried to apply Roark’s formulas to this situation, but I don’t think they can directly apply. FEA analysis gives me much different results than using Roark’s formulas.

I am showing two scenarios in the picture below.

A: Load direction over a single stiffener.
B: Load spanning two stiffeners.

Any help would be appreciated.
 

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XaeroR35: I suppose Roark formulas are for something completely different from this scenario. Therefore, they would not be expected to be applicable nor give the same answer. There is not always a hand-calculation formula for nontrivial plate problems (unless you want to be conservative and basically ignore plate action). Do you not trust your FEA? It seems it would probably be close to the correct answer.
 
Last edited:
Yes, I trust FEA. I just need to know if there is a way to do this calculation by hand.
 

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