How to read graphs?: British Engine Technical Report 1981 Volume XIV - Non-Circular Pressure Vessels

[ostaalesen]

Hi,

I am using this report as the basis for a tank I am dimensioning. I was wondering if someone could help me understand the graph on page 69 in the report (rectangular tank curved corners).

I have a height/length ratio of 1,0. My radii/length ratio is 0,22. How do I find the value kappa?

Link to the paper I'm refering to.

British Engine Technical Report 1981 Volume XIV
Non-Circular Pressure Vessels

http://www.gowelding.com/pv/square.pdf

 

[structSU10]

It appears you use h/L for chart on pg 69 and move over to the line, and go down to read what kappa is. for th radii/length, the chart on pg 70 works the same way to get kappa A and kappa B. At least as far as i can tell.

 

[ostaalesen]

If kappa is on the horizontal axis and radii/length is on the vertical I assume that you are referring to radii/length. I assumed the same at first.

Using the values for r/L and following that procedure I get a kappa of approx 0.053. In comparison to the rectangular cross section the moment for the rounded edges will be lower than when it is perfectly square as expected. This is as I would expect.

 

[rb1957]

it does look a very confusing graph ... well, the graph is clear enough, the comments are IMHO really confusing.

i wonder if you should consider r/L and r/h ?

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