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Force required to bend steel rod?

Force required to bend steel rod?

Force required to bend steel rod?

How can I calculate a concentrated force needed to bend/deform a mild steel rod (3/8")?  I am familiar with behaviour of materials in the linear region, but not with deformation mechanics.

Thanks in advance.


RE: Force required to bend steel rod?

Permanent deformation is related to operation beyond the proportional limit. If you visualize the situation at the P.L., there is a force proportional to the stress at the outer fiber (s=Mc/I). Now, beyond the P.L., 50% of the fibers will be at yield at twice the bending load. 67% of the fibers will be at yield at three times the load, etc. So, you can visualize that about 3 times the load at the P.L. will give you nearly full yield and permanent bend.

RE: Force required to bend steel rod?

Correction -
Rule of thumb would be near full plastic bending at about three times the strain at PL for ductile materials. The load will be about approx 2 times the load at PL.

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