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  • Making fender brace

    Was debating on whether to use 1" square stock or 1" angle and weld. I would think that angle is sufficient if you weld on to make a triangle after welding and it's essentially half the weight of square.
    Conversely, I have this stuff below but it's at least half as thin as the angle or box. I can get all materials for free so cost isn't an issue at this point.





    Thoughts from you engineering folk?

  • #2
    Go with rectangular tubing.
    '18 Chevrolet Volt - Electric fun hatch for DD duty!


    DefSport Koni Sleeve and Spring Perch Buy!!!
    http://www.nissanroadracing.com/showthread.php?t=5902

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    • #3
      Originally posted by Def View Post
      Go with rectangular tubing.
      Rectangular tube? Aren't tubes round?

      Anyway, what dimensions you think are good? 1.5 x 0.5? 2 x 1? 3x1? 16ga?

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      • #4
        The ones I've seen are made from about 1/2" x 1" rectangular tubing.

        angle iron is heavy and not that strong for what you want because it will twist much easier than tube. it's fine in compression/tension, but not in torsion. add a few other reasons, but the tube is easy to source and easy to cut and weld if you're doing straight cuts.
        Originally posted by SoSideways
        I don't care what color they are as long as they are LONG AND HARD.
        '04 G35 Sedan 6MT- The DD
        '96 240SX- The Track Toy

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        • #5
          Isn't this brace under tension/compression mostly?

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          • #6
            Originally posted by Beejis60 View Post
            Rectangular tube? Aren't tubes round?

            Anyway, what dimensions you think are good? 1.5 x 0.5? 2 x 1? 3x1? 16ga?
            Round tubing is round, but since it's the most commonly used type of tubing, most people drop the "round" nomenclature. Rectangular tubing is the proper term for it - http://www.onlinemetals.com/merchant...=2&top_cat=849


            The more you know...
            '18 Chevrolet Volt - Electric fun hatch for DD duty!


            DefSport Koni Sleeve and Spring Perch Buy!!!
            http://www.nissanroadracing.com/showthread.php?t=5902

            Comment


            • #7
              BTW - these tubes would not be under torsion, they are primarily loaded in bending in a fender brace.

              Therefore you want a high section modulus for a given weight in the axis it is loaded.

              http://en.wikipedia.org/wiki/Section_modulus


              (oh look at that, they even have the section modulus formula for a rectangular tube listed.... )
              '18 Chevrolet Volt - Electric fun hatch for DD duty!


              DefSport Koni Sleeve and Spring Perch Buy!!!
              http://www.nissanroadracing.com/showthread.php?t=5902

              Comment


              • #8
                Originally posted by hai1206vn View Post
                Isn't this brace under tension/compression mostly?
                Mostly, yes. But consider the wet noodle chassis that is the s13, and you throw in torsion every time the chassis twists.
                Originally posted by SoSideways
                I don't care what color they are as long as they are LONG AND HARD.
                '04 G35 Sedan 6MT- The DD
                '96 240SX- The Track Toy

                Comment


                • #9
                  Its mainly under bending, and essentially zero torsion.
                  '18 Chevrolet Volt - Electric fun hatch for DD duty!


                  DefSport Koni Sleeve and Spring Perch Buy!!!
                  http://www.nissanroadracing.com/showthread.php?t=5902

                  Comment


                  • #10
                    Originally posted by Matt93SE View Post
                    The ones I've seen are made from about 1/2" x 1" rectangular tubing.

                    angle iron is heavy and not that strong for what you want because it will twist much easier than tube. it's fine in compression/tension, but not in torsion. add a few other reasons, but the tube is easy to source and easy to cut and weld if you're doing straight cuts.
                    got it.

                    Originally posted by Def View Post
                    Round tubing is round, but since it's the most commonly used type of tubing, most people drop the "round" nomenclature. Rectangular tubing is the proper term for it - http://www.onlinemetals.com/merchant...=2&top_cat=849


                    The more you know...
                    and we know that knowing is half the battle...




                    Originally posted by Def View Post
                    (oh look at that, they even have the section modulus formula for a rectangular tube listed.... )
                    :isee:

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                    • #11
                      this is the one imade

                      pretty simple and basic
                      Attached Files

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                      • #12
                        and this a power brace i made
                        Attached Files

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