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  1. #1
    Registered User pvsampson's Avatar
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    Tensile strength of steel.

    There is a good thread going in the O35,and if you check post 24 I thought some here may be able to help.


    http://forum.bodybuilding.com/showth...post1012656173
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  2. #2
    Registered User GarageIron's Avatar
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    I buzzed through it but I think I get the conversation.

    Tensile strength here means nothing. That is just the tension required to permanently deform the steel.

    The flex in the steel is what is being discussed in that thread. That is determined by the diameter of the grip and not the steel strength (Power bars are 29mm, oly bars 28mm, squat bars 32mm, and Deadlift bars 27mm)

    It seems logical that stronger steel would flex less under the same load but that's just not true. Carbon steel has similar elasticity from the weakest to the strongest strengths (see modules of elasticity). They all flex the same (assuming the same diameter), but fail at different points.

    Texas Deadlift bars add pounds to anyone's dead by being 27mm. It allows you a better grip, it flexes more because its thinner and its longer (7.5ft). It's a mechanical advantage.

    You don't get the full load of the plates until you are higher in the lift. So yes, the folks calling it a rack pull are correct in comparison to a regular 7ft 29mm power bar. It's still amazing, but it not the same as the lift would be on other bars.

    I hate to make the comparison, but its like saying you benched 400 on a bowflex. Every bar flexes, so everyone that has ever Deadlifted has pulled flex from a bar. More weight= more flex, thinner bar=more flex, longer bar=more abilty to leverage the flex.
    Last edited by GarageIron; 01-20-2013 at 05:01 AM.
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  3. #3
    Registered User pvsampson's Avatar
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    Cool.Thanks mate.

    Can I copy this to the thread?
    Last edited by pvsampson; 01-19-2013 at 08:20 PM.
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  4. #4
    Registered User GarageIron's Avatar
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    Originally Posted by pvsampson View Post
    Cool.Can I copy this to the thread?
    I guess so. I'm sure it will lead to some sort of battle though.
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  5. #5
    Registered User pvsampson's Avatar
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    Yeah well,let 'em figure it out.
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  6. #6
    Home gym 'til I die. ProtienandIron's Avatar
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    Thats a pretty cool vid sampson. I'm not sure what the arguments are about though. Its like any competition/record, the results are only comparable to other events where the same equipment is used.
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  7. #7
    Registered User pvsampson's Avatar
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    Exactly.I have no problem with any "record" in the thread.One is Strongman,the other Powerlifting.What I found interesting was the posting that led to the tensile strength of bars.I've been lurking this section for a while now,and sometimes I even participate ,but the post got me thinking and I feel Garageiron was right in the difference between "tensile" strength and "elastic" strength.

    If it don't flex,it gonna break.
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  8. #8
    Registered User GarageIron's Avatar
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    Originally Posted by pvsampson View Post
    Exactly.I have no problem with any "record" in the thread.One is Strongman,the other Powerlifting.What I found interesting was the posting that led to the tensile strength of bars.I've been lurking this section for a while now,and sometimes I even participate ,but the post got me thinking and I feel Garageiron was right in the difference between "tensile" strength and "elastic" strength.

    If it don't flex,it gonna break.
    I just re read my post again and I should clarify that ultimate tensile strength is the amount of force required to cause the steel to fail (break or pull apart) Yeild strength is the amount or tension required to permanently deform the steel. Yeild is a type of tensile strength but the yeild limit will be lower than the ultimate tensile strength. Neither is really relevant here but I did not explain it correctly in my first post.
    Last edited by GarageIron; 01-20-2013 at 06:54 AM.
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