How to calculate radius of curvature of beam?

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    Beam Curvature Radius
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SUMMARY

The radius of curvature of a bent beam can be determined using the formula R = EI/M, where E is the modulus of elasticity, I is the moment of inertia of the beam's cross-section, and M is the applied moment. This formula applies to prismatic beams and requires knowledge of the beam's material properties and loading conditions. For thin and flexible beams, a cubic spline can be utilized to approximate the curvature. This discussion clarifies that fixing one end of the beam while bending the other is sufficient information to calculate the radius of curvature.

PREREQUISITES
  • Understanding of modulus of elasticity (E)
  • Knowledge of moment of inertia (I) for beam cross-sections
  • Familiarity with applied moment (M) in beam theory
  • Basic concepts of spline curves in engineering design
NEXT STEPS
  • Research the calculation of moment of inertia for various beam shapes
  • Study the principles of beam bending and the relationship between load and curvature
  • Explore cubic spline interpolation techniques for curve fitting
  • Investigate the effects of material properties on the radius of curvature in different materials
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Engineers, physics students, and professionals involved in structural analysis or design, particularly those working with beam mechanics and curvature calculations.

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If I start out with a flat beam of length a and then I fix one side and then bend the other side up to form an arc with height h, is that enough information to determine the radius of curvature of the bent beam? If so, how would I do it?

Thanks!

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If I start out with a flat beam of length a and then I fix one side and then bend the other side up to form an arc with height h, is that enough information to determine the radius of curvature of the bent beam? If so, how would I do it?

Don't you mean fix one end?
And doesn't this belong in an engineering or physics forum?

The radius of curvature at any point on a prismatic beam is equal to EI/M,

Where E is the modulus of elasticity, I is the moment of inertia of the cross section and M is the applied moment at that point. M depends upon the loading regime, E and I are characteristic properties of the beam itself.

Alternatively, if your 'beam' was thin and flexible enough you could use a spline curve. A cubic spline would be usual. These are the curves taken up by old fashioned draftsmen's splines used for drawing such curves.
 

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