Metric and Imperial Units

The above formulas may be used with both imperial and metric units. As with all calculations care must be taken to keep consistent units throughout with examples of units which should be adopted listed below:

Notation

• B = breadth, in or mm
• D = depth, in or mm
• I = second moment of area, in⁴ or mm⁴
• Q = first moment of area, in³ or mm³
• v = Poisson's ratio, unitless
• V = transverse shear force (from shear force diagram), lbf or N
• x = distance to point of interest, in or mm
• t_H = horizontal shear force, Psi or MPa