Conqueror Companion A-Frame Failure!! - Page 7





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  1. #121
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    Default Re: Conqueror Companion A-Frame Failure!!

    Quote Originally Posted by Erwin Schimper View Post
    I have a few trailers. Build and desiged one myself. All for cargo. The Goudi trailer I bought in 2004. It is has a payload of 2ton it is double axle. This trailer has done 100 000km plus with a full load on tar and dirt loads with no problems. The A frame is 100mm x 50mm x 5m channel and has gusset plate were the trailer body meets the A frame. The one I build I use 100mm x 50mm x 3mm tube also with gusset plates. This is important as this is where the A frame has the biggest stress and bend.
    Yes the highest bending moment is at the location. The highest tensile stress is only at the outside face of the bottom flange. That face will suffer crack initiation if the stress is too high.

    To weld a gusset to the side of the beam or weld across the top face of the beam is acceptable because the maximum tensile stress doesn't occur there. (the top flange is in compression)

    Maybe someone who's worked with this more recently can advice, but on memory I think that one can allow 150MPa tensile stress to have infinite life for cyclic loading. Add a weld across the bottom flange and you don't allow more than 30MPa (nominal stress)! Add a hole and you probably rise the stress by a factor of two to three, forcing you to change your design so that you reduce the nominal stress to 50 or 75MPa.


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  3. #122
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    Default Re: Conqueror Companion A-Frame Failure!!

    Quote Originally Posted by Congo View Post
    Now my trusted insurance company have given me notice of cansellation of policy due to repeated claims on the Conquerors.

    Eish, fun times.


    In the meantime my replacement on the A-frame (the strong one) is going in to galvanizing today and should be all done by next week.
    Hi Congo I've heard from other people who have had this happen that it is best to see if you can ask them if you can cancel the insurance from your side rather - it is then much easier to get insurance the next time than if they had cancelled from their side. Don't know exactly why because your claims history is still the same, but apparently being cancelled by an insurer is a bad thing (worst case if there was non payment of premiums, but even cancellation for high claim to premium ratio is not a good thing).

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  5. #123
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    Default Re: Conqueror Companion A-Frame Failure!!

    Quote Originally Posted by Jeepiscool View Post
    , but on memory I think that one can allow 150MPa tensile stress to have infinite life for cyclic loading. Add a weld across the bottom flange and you don't allow more than 30MPa (nominal stress)! Add a hole and you probably rise the stress by a factor of two to three, forcing you to change your design so that you reduce the nominal stress to 50 or 75MPa.

    The problem is one dont know what design criteria did they use. Stresses will be much less than that for static loads if only 50kg on the towbar. There is probably a standard load, and load factor (x5 as you mentioned?) to increase the load for live loads (impacts) to use in the industry for such applications. Did they use that or not, if yes, then obviously there is somewhere an issue, which they don't want to address seemingly, and put the claim on abuse. Up to know it seemingly don't hurt them.
    Johan Kriel

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  6. #124
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    Default Re: Conqueror Companion A-Frame Failure!!

    Regardless of the load, you don't put a hole in the bottom (stressed) flange of a 'box' element!
    Last edited by 4eTouareg; 2017/06/02 at 09:54 AM.
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  8. #125
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    Default Re: Conqueror Companion A-Frame Failure!!

    Quote Originally Posted by 4eTouareg View Post
    Regardless of the load, you don't put a hole in the bottom (stressed) flange of a 'box' element!

    That also!
    Johan Kriel

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  9. #126
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    Default Re: Conqueror Companion A-Frame Failure!!

    Quote Originally Posted by Jeepiscool View Post
    Yes the highest bending moment is at the location. The highest tensile stress is only at the outside face of the bottom flange. That face will suffer crack initiation if the stress is too high.

    To weld a gusset to the side of the beam or weld across the top face of the beam is acceptable because the maximum tensile stress doesn't occur there. (the top flange is in compression)

    Maybe someone who's worked with this more recently can advice, but on memory I think that one can allow 150MPa tensile stress to have infinite life for cyclic loading. Add a weld across the bottom flange and you don't allow more than 30MPa (nominal stress)! Add a hole and you probably rise the stress by a factor of two to three, forcing you to change your design so that you reduce the nominal stress to 50 or 75MPa.
    Your numbers are pretty much on the money for fillet welds.

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  11. #127
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    Default Re: Conqueror Companion A-Frame Failure!!

    My 2017 Companion A frame is definitely reinforced in that area. On the bottom and inside the channel.
    Merlin van Zyl


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  12. #128
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    Default Re: Conqueror Companion A-Frame Failure!!

    Could you post a Photo Merlin. I would like to compare it to my older Companion.

  13. #129
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    Default Re: Conqueror Companion A-Frame Failure!!

    Will do, as soon as I get it back from Conqueror.
    Merlin van Zyl


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  14. #130
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    Default Re: Conqueror Companion A-Frame Failure!!

    New A-Frame made and fitted.

    We used 100 x 50 x 5mm rectangular tubing, the area under the cross member was reinforced by a oval fish plate. To this plate we mounted brackets that attached the body.

    Standard compression pipes were fitted where needed.

    I do believe that this will last for a trip or 2.......
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  15. #131
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    Default Re: Conqueror Companion A-Frame Failure!!

    Quote Originally Posted by Merlin4WP View Post
    Will do, as soon as I get it back from Conqueror.
    Kindly post some photo's would love to see
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  16. #132
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    Default Re: Conqueror Companion A-Frame Failure!!

    These are a pic or 2 of the hole on the frames that we did emergency repairs on
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  17. #133
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    Default Re: Conqueror Companion A-Frame Failure!!

    [QUOTE=DCTheron;3583709]

    "Even though I did my best to avoid any damage to the A-frame, I was constantly aware of the weakness and had a brand new A-frame lying in my garage just in case. (I still need to get rid of it)."

    Hi Theron. I just bought a second hand Companion, and after reading this thread I checked it and found it to be cracked on the A frame exactly where the others have found the cracks. Im looking to replace the A frame and would be interested in the one you are looking to get rid of, if its available? What would be the best way to contact you?

  18. #134
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    Default Re: Conqueror Companion A-Frame Failure!!

    Quote Originally Posted by DCTheron View Post

    Even though I did my best to avoid any damage to the A-frame, I was constantly aware of the weakness and had a brand new A-frame lying in my garage just in case. (I still need to get rid of it).
    Hi Theron. I just bought a second hand Companion, and after reading this thread I checked it and found it to be cracked on the A frame exactly where the others have found the cracks. Im looking to replace the A frame and would be interested in the one you are looking to get rid of, if its available? What would be the best way to contact you?

  19. #135
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    Default Re: Conqueror Companion A-Frame Failure!!

    Why would you wan't to replace an A-frame that clearly has cracks as stated with the same design? They have not changed anything.....
    Land Rover is not a vehicle it is a cult!
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  20. #136
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    Default Re: Conqueror Companion A-Frame Failure!!

    Quote Originally Posted by Congo View Post
    New A-Frame made and fitted.

    We used 100 x 50 x 5mm rectangular tubing, the area under the cross member was reinforced by a oval fish plate. To this plate we mounted brackets that attached the body.

    Standard compression pipes were fitted where needed.

    I do believe that this will last for a trip or 2.......
    Did you remember to drill the holes the same as Conquerors design

    (sorry, just a tongue in cheek reply)
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  21. #137
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    Talking Re: Conqueror Companion A-Frame Failure!!

    Quote Originally Posted by Charlie100 View Post
    Did you remember to drill the holes the same as Conquerors design

    (sorry, just a tongue in cheek reply)
    LOL......yep. Actually only attached it with Silicon and 5 rivits like the rest of the body.....
    Land Rover is not a vehicle it is a cult!
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  22. #138
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    Default Re: Conqueror Companion A-Frame Failure!!

    Here are the pics of the reinforcement.
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    Merlin van Zyl


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  24. #139
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    Default Re: Conqueror Companion A-Frame Failure!!

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    Seems they also added new holes!
    Merlin van Zyl


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  26. #140
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    Default Re: Conqueror Companion A-Frame Failure!!

    Quote Originally Posted by Merlin4WP View Post
    Here are the pics of the reinforcement.
    Thanks for the photo's. Is that not the "skid plate" Congo referred to in post 32 ?

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