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  1. #1
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    Default Two layer cultivator shank

    i have a pic that in a cultivator shank has 2 layer.
    Why the shank is made of two layers?
    -untitled-jpg

  2. #2
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    Default Re: Two layer cultivator shank

    Allows more flex or spring.

  3. #3
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    Default Re: Two layer cultivator shank

    Quote Originally Posted by 2458n View Post
    Allows more flex or spring.
    Inner layer is under tension, and the outer layer is under pressure in actual.
    are two layers material different?

  4. #4
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    Default Re: Two layer cultivator shank

    That looks more like chisel plow shank , runs deeper than a cultivator . Actually 2 layers stiffen it up alittle and still allow some flex .

  5. #5
    Veteran Member D7E's Avatar
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    Default Re: Two layer cultivator shank

    This appears to be a john deere C10 leg . Light field cultivator , This type flex too much and dont penetrate as good as a heavier single shank as a chisel plough and tend to straighten out with age .
    Attached Thumbnails Attached Thumbnails -9804-jpg  

  6. #6
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    Default Re: Two layer cultivator shank

    Thank you D7E

  7. #7
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    Default Re: Two layer cultivator shank

    plz specify your comment source? im need sources.
    where i can find technical (Engineering) information about it?
    ex. design parameter or formula!
    extra from http://www.industriehof.com/katalog/...e/2747?lang=en
    Can i use the leaf springs relations for it?
    Last edited by omidlolo; 01-24-2013 at 03:55 AM.

  8. #8
    Veteran Member MHarryE's Avatar
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    Default Re: Two layer cultivator shank

    Bending stiffness is equivalent to the modulus of elasticity and the moment of inertia. In the case of the flat bar which is the actual cross section of each cultivator shank at any point, the moment of inertia is width x thickness cubed / 12 (English measures). If it was a single beam for example 1 inch by 1 inch for easy calculations, I = (1 x 1)/12 or 1/12. In this case you have 2 beams each 0.5 thick. The cube of 0.5 is 0.125 so each beam has a moment of inertia of .125/12, but you have 2 independent beams stacked so it is additive or 0.25/12. The formula is M=EIk where M is the bending moment, E is the modulus of elasticity for the material being used, and I is the area moment of inertia. k is the resulting curvature. Two thicknesses stacked together are 1/4 as rigid as 1 single thickness unless they are completely fused for the entire length.
    JD7720; KubotaM135GX; NH TS115A; JD6230; KubotaL5740

  9. #9
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    Default Re: Two layer cultivator shank

    Quote Originally Posted by MHarryE View Post
    Bending stiffness is equivalent to the modulus of elasticity and the moment of inertia. In the case of the flat bar which is the actual cross section of each cultivator shank at any point, the moment of inertia is width x thickness cubed / 12 (English measures). If it was a single beam for example 1 inch by 1 inch for easy calculations, I = (1 x 1)/12 or 1/12. In this case you have 2 beams each 0.5 thick. The cube of 0.5 is 0.125 so each beam has a moment of inertia of .125/12, but you have 2 independent beams stacked so it is additive or 0.25/12. The formula is M=EIk where M is the bending moment, E is the modulus of elasticity for the material being used, and I is the area moment of inertia. k is the resulting curvature. Two thicknesses stacked together are 1/4 as rigid as 1 single thickness unless they are completely fused for the entire length.
    why 1/4?

  10. #10
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    Default Re: Two layer cultivator shank

    Quote Originally Posted by MHarryE View Post
    Bending stiffness is equivalent to the modulus of elasticity and the moment of inertia. In the case of the flat bar which is the actual cross section of each cultivator shank at any point, the moment of inertia is width x thickness cubed / 12 (English measures). If it was a single beam for example 1 inch by 1 inch for easy calculations, I = (1 x 1)/12 or 1/12. In this case you have 2 beams each 0.5 thick. The cube of 0.5 is 0.125 so each beam has a moment of inertia of .125/12, but you have 2 independent beams stacked so it is additive or 0.25/12. The formula is M=EIk where M is the bending moment, E is the modulus of elasticity for the material being used, and I is the area moment of inertia. k is the resulting curvature. Two thicknesses stacked together are 1/4 as rigid as 1 single thickness unless they are completely fused for the entire length.
    Excellent explaination, I was not aware of this formula. I will have to retain this for future reference.

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