Calculating Surface Strength for Aluminum Foil and Other Materials"

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The discussion focuses on calculating the surface strength of materials, specifically aluminum foil, under localized pressure. There is uncertainty about the applicability of Barlow's formula for flat surfaces instead of tubes. Participants explore the concept of contact stress and its relation to pressure, including fluid and air pressure scenarios. The need for a general formula applicable to various materials is emphasized, particularly in relation to burst disks and their pressure thresholds. The conversation highlights the complexity of determining material strength under specific conditions.
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What I'm trying to do is determine the surface strength of a material. I'm not sure if Barlow's formula would apply, as it's not a tube, but rather a flat surface. The pressure will be exerted on a particular spot on the flat surface. How can I calculate this?

For the record, I'm asking about aluminum foil, but I would like to know a general formula, if you will, for different materials.

Thanks in advance
 
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Hubb said:
What I'm trying to do is determine the surface strength of a material. I'm not sure if Barlow's formula would apply, as it's not a tube, but rather a flat surface. The pressure will be exerted on a particular spot on the flat surface. How can I calculate this?

For the record, I'm asking about aluminum foil, but I would like to know a general formula, if you will, for different materials.

Thanks in advance

I presume you're looking for the contact stress. The strength of the material is a material property.

http://www.ecs.umass.edu/mie/labs/mda/dlib/ref/contact.html

CS
 
Would this apply to pressure as well, instead of another object pushing on the material?
 
Hubb said:
Would this apply to pressure as well, instead of another object pushing on the material?

As in fluid pressure like a water jet?

CS
 
As in air pressure
 
Hubb said:
As in air pressure

Define what you mean by surface strength.

CS
 
How much pressure will it be able to take before it is broken.

Have you ever heard of a burst disk? This is a "valve" that will open at a certain amount of pressure. I'm trying to determine if there is any formula for calculating the pressure needed to open a burst disk. The material is not set, and neither is the diameter of the burst disk surface (which would be the surface I am trying to determine the strength of).

I've been searching and trying to figure this out for a while now, but everything I come across, just leads to a dead end.

I, sir, do apologize. I should have been more clear earlier.
 

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