Thickness of 304 stainless sheet to avoid puncture

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Discussion Overview

The discussion revolves around determining the minimum thickness of a 304 stainless steel cylinder's outer wall to prevent puncture from a falling steel bar. The context includes considerations of material properties, load calculations, and structural integrity under specific conditions.

Discussion Character

  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • One participant is calculating the necessary thickness based on the impact of a 6-inch diameter steel bar falling from a height of 1 meter onto the cylinder.
  • Another participant inquires about the outer diameter of the cylinder, suggesting that this information is crucial for further calculations.
  • A participant provides a calculation involving the yield strength of stainless steel 304, using specific values for stress and force, but expresses uncertainty about the logical correctness of their approach.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the calculations or the assumptions made regarding the thickness required to prevent puncture. There is uncertainty about the logical steps taken in the calculations presented.

Contextual Notes

The discussion includes potential limitations related to the assumptions made about material properties, the impact dynamics, and the specific conditions under which the calculations are applied.

Nick P
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Designing a cylinder using Stainless Steel 304 and am trying to figure out the minimum thickness of the outer wall of the cylinder to avoid being puncture by a 6in diameter steel bar after falling 1 meter onto the bar.

Cylinder will weigh approximately 5500kg.
 
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What is the outer diameter of the cylinder?
 
0.7512 meters
 
What I have right now... is that

Syp,SS304=206.8MPa

F=π(.075m)2*206.8E6 = 3.66MN

and relating that to the current thickness we have at 5cm

σ=[itex]\frac{3.66MN}{.15m*.05m}[/itex]=488MPa

And 488MPa < Sut,SS304 with Sut,SS304=517.02MPa

But I'm pretty positive I'm making some logical error here.
 

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