# Thickness of 304 stainless sheet to avoid puncture

1. May 2, 2012

### Nick P

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.

2. May 2, 2012

### huntoon

What is the outer diameter of the cylinder?

3. May 2, 2012

### Nick P

0.7512 meters

4. May 2, 2012

### Nick P

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=$\frac{3.66MN}{.15m*.05m}$=488MPa

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

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