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Thread: Deforming steel bar/plate

  1. #1
    Registered User Mini_Me's Avatar
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    Deforming steel bar/plate

    Can anyone help me figure out how much force it will take to deform steel plate?

    65mm x 8mm plate & 65x10mm plate
    If one end is secured and I have 1300mm free length with no support what force will it take to deform ? Bending is ok.

    thanks


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    Last edited by Mini_Me; 15-04-19 at 02:08 PM.

  2. #2
    Look behind you... Milkman Don's Avatar
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    Is this a lintel for brickwork?
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  3. #3
    Registered User Mini_Me's Avatar
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    Deforming steel bar/plate

    A fence!




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    Last edited by Mini_Me; 15-04-19 at 01:22 PM.

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    BLING BLING PLAYA's Avatar
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    In what direction?
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  5. #5
    Registered User Mini_Me's Avatar
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    Quote Originally Posted by PLAYA View Post
    In what direction?
    The 8mm / 10mm thickness direction


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  6. #6
    Unregistered User Permit Roadsailing's Avatar
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    buy a length and try it, actually buy two as after you deflect it by the spacing between two bits you will be trying to bend two bits.

    shit looking fence IMHO, but it should pass the cordless angle grinder test.

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    Convicted User data_mine's Avatar
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    sharpen all the edges and no one will try (for very long) bending it.
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  8. #8
    Racer 36's Avatar
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    A lot.

    Perhaps the better question is how do you hold one end of a 1.3m piece of steel well enough that you can apply enough force to deform it?

  9. #9
    Registered User Mini_Me's Avatar
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    Quote Originally Posted by 36 View Post
    A lot.

    Perhaps the better question is how do you hold one end of a 1.3m piece of steel well enough that you can apply enough force to deform it?
    My current plan is that the steel will actually be approx 1.55mm long with 0.25m embedded in a 300mm strip footing. Do you think that would be ok?


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  10. #10
    BLING BLING PLAYA's Avatar
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    The flat bar get 2 holes punched in the bottom from someone with a punch and shear and run reo rod through the holes. Say 200mm apart and 50mm concrete cover. Tack the flat bar to it, in the real world that is not a done thing but in this it is fine. Would make it proper strong.
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  11. #11
    Registered User Mini_Me's Avatar
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    Deforming steel bar/plate

    Quote Originally Posted by PLAYA View Post
    The flat bar get 2 holes punched in the bottom from someone with a punch and shear and run reo rod through the holes. Say 200mm apart and 50mm concrete cover. Tack the flat bar to it, in the real world that is not a done thing but in this it is fine. Would make it proper strong.
    I like that idea and itís quite similar to what I was planning
    I am thinking to get extra flat bar and weld to the sides of the uprights, below ground.

    Problem is still understanding what cantilever the steel can withstand. A formula I found seems to indicate ~25kg but unsure


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    Last edited by Mini_Me; 16-04-19 at 07:10 PM.

  12. #12
    Registered User boosted's Avatar
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    Assuming you use 350 grade plate, 8 mm will yield at about 20 kg and 10 at about 30 kg.

    W 10 mm
    D 65 mm
    L 1300 mm
    I 5417 mm4
    Fy 350 MPa
    y 5 mm
    F 292 N
    29.7 Kg

    And will be at 50 mm deflection
    Last edited by boosted; 16-04-19 at 07:42 PM.

  13. #13
    Registered User Mini_Me's Avatar
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    Perfect! Thanks
    Thatís the formula I used but wasnít sure if I was doing it right



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    Registered User Marlin's Avatar
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    A 250mm footing? Seriously? I do 600 to 900 around here. But my shit doesnít fall over.

  15. #15
    Registered User Mini_Me's Avatar
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    Deforming steel bar/plate

    Quote Originally Posted by Marlin View Post
    A 250mm footing? Seriously? I do 600 to 900 around here. But my shit doesnít fall over.
    The original triple brick building from 1889 has no concrete footing, just 200mm of crushed rock and itís still standing.
    I think a 300mm strip footing for a fence will be fine


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    Registered User Marlin's Avatar
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    Iím envious of your soil quality.

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    Wouldn't it be better to have rectangular tube with tops welded on them? It'll fail badly when it does, but that would be stronger and cheaper, wouldn't it??

    I would expect welding them all together is a good idea because everyone is going to walk past that fence and try and make them all wobble...

  18. #18
    Down with ma homies Greg Rust's Avatar
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    The flat bar in that fence is 20mm thick. 8mm will wobble in a storm.
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    Registered User lukevl's Avatar
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    Quote Originally Posted by greg rust View Post
    the flat bar in that fence is 20mm thick. 8mm will wobble in a light breeze.
    ftfy

  20. #20
    Registered User Mini_Me's Avatar
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    Quote Originally Posted by nutttr View Post
    Wouldn't it be better to have rectangular tube with tops welded on them? It'll fail badly when it does, but that would be stronger and cheaper, wouldn't it??

    I would expect welding them all together is a good idea because everyone is going to walk past that fence and try and make them all wobble...
    Visually I think the hollow tube would be a lot bulkier than what we are looking for


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  21. #21
    Registered User Mini_Me's Avatar
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    Deforming steel bar/plate

    Quote Originally Posted by Greg Rust View Post
    The flat bar in that fence is 20mm thick. 8mm will wobble in a storm.
    I donít think so.
    Hereís a pic I found of one that looks close to the dimensions Iím thinking of, though itís probably only 1m high. Mine will be 900-1300 (sloping block)




    Bought some this morning and it certainly seems rigid enough that it wonít noticeably move from wind.




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    Last edited by Mini_Me; 17-04-19 at 09:09 AM.

  22. #22
    Registered User lukevl's Avatar
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    That pic still looks like 12-16mm plate.

    I don't dislike the look of it but do you need to consider public safety where this fence is? It wouldn't feel nice falling on it or a kid crashing their bike into it

  23. #23
    Registered User Mini_Me's Avatar
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    Quote Originally Posted by lukevl View Post
    That pic still looks like 12-16mm plate.

    I don't dislike the look of it but do you need to consider public safety where this fence is? It wouldn't feel nice falling on it or a kid crashing their bike into it
    Yeah maybe 12mm
    I will test some 10mm but so far it looks good.
    Council are happy with it. Maybe ill radius the corners a bit?


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  24. #24
    Registered User lukevl's Avatar
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    As long as council are happy with it then its all good I guess!

    Yeah would definitely radius the edges a few mm. Maybe put up a few signs suggesting people don't fall face first onto it also

  25. #25
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    Something like 10mm Hardox 500 wont deform fuck all if you have an issue with the mild stuff.

    Don't mention the adBlocker !!


  26. #26
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    Are you installing a scale model of Trump's Wall?
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  27. #27
    Registered User Mini_Me's Avatar
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    Quote Originally Posted by Gammaboy View Post
    Are you installing a scale model of Trump's Wall?
    Yes!

    #makenorthcotegreatagain


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  28. #28
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    Ah, Northcote. Needs a fence that no-one can balance takeaway coffee cups on.

  29. #29
    Registered User Mini_Me's Avatar
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    Deforming steel bar/plate

    Quote Originally Posted by aerobrick View Post
    Ah, Northcote. Needs a fence that no-one can balance takeaway coffee cups on.
    Maybe if I built it last year....The hipsters all use re-usable cups now




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    Last edited by Mini_Me; 17-04-19 at 03:18 PM.

  30. #30
    BLING BLING PLAYA's Avatar
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    Quote Originally Posted by Marlin View Post
    A 250mm footing? Seriously? I do 600 to 900 around here. But my shit doesnít fall over.
    I just said how far in the bars into your footing I would do it. The footing would be deeper but a 900 strip footing is a bit mental for this.
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