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» Shape Factor
The SHAPE FACTOR of a
cross-section gives us an idea of how effective the cross-section is in
carrying load per its weight (squared). The idea of Shape Factors presented
here was developed in detail by Dr. Michael F. Ashby, of Cambridge University.
The Shape Factor for Elastic Bending (fBe)
- i.e. the stiffness - is defined as:
Values for various shapes are given below (from Materials Selection
in Mechanical Design, M.F. Ashby). The shape factors are, from
left to right, for: (1) Elastic Bending Stiffness, (2) Elastic Torsional
Stiffness, (3) Bending Strength and (4) Torsional Strength.
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