Edb2 e 3 T

L GYldb3

To take account of the stress concentrations at the fillets of such sections, however, Timo-shenko and Young^ suggest that the maximum shear stress as calculated above is multiplied by the factor r b'

(Figure 5.3). This has been shown to be fairly reliable over the range 0 < a/b < 0.5. In the event of sections containing limbs of different thicknesses the largest value of b should be used.

t S. Timoshenko and A.D. Young, Strength of Materials, Van Nostrand. New York, 1968 edition.

5.4. Thin-walled split tube

The thin-walled split tube shown in Fig. 5.4 is considered to be a special case of the thin-walled open type of section considered in ยง5.3. It is therefore treated as an equivalent rectangle with a longer side d equal to the circumference (less the gap), and a width b equal to the thickness.

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