- #1
iionas
- 6
- 0
I have just reg'd here and I have been lurking forever but its time to give in so I can get some help.
Ive been working through some examples in this book; and so far so good however I am on a question which does not make sense the way I am working it out seems to me to be correct however the answer directs me elsewhere.
The question is on hear force.
Determine the force required to punch 20 x 15 mm rectangular holes in am ild steel plate 8mm thick..
Now I've done a similar question but with a circle instead of the rectangle..
I don't see the problem here..
Formulas which it prompts me to use is for Area = 20 x 15 x t (8) t = thickness..
Which is 2400 respectively. With this answer I multiply for the USS (ultimate shear strength of the material which is given mild steel = 360N .
And I get a figure of 864,000 or 864 KN..
The answer in the back of this book is 202kN. I am Stumped What Am I doing wrong?
Apologies if this is a bit to simple or It comes off as stupid. Its racking my brain...
Ive been working through some examples in this book; and so far so good however I am on a question which does not make sense the way I am working it out seems to me to be correct however the answer directs me elsewhere.
The question is on hear force.
Determine the force required to punch 20 x 15 mm rectangular holes in am ild steel plate 8mm thick..
Now I've done a similar question but with a circle instead of the rectangle..
I don't see the problem here..
Formulas which it prompts me to use is for Area = 20 x 15 x t (8) t = thickness..
Which is 2400 respectively. With this answer I multiply for the USS (ultimate shear strength of the material which is given mild steel = 360N .
And I get a figure of 864,000 or 864 KN..
The answer in the back of this book is 202kN. I am Stumped What Am I doing wrong?
Apologies if this is a bit to simple or It comes off as stupid. Its racking my brain...