21 A plate used as a tension member must transition from a w

#21

A plate used as a tension member must transition from a width w to a width 1.5w over a length not to exceed 0.25w. The tensile force on the member alternates during many cycles of applied load. Of the proposed details shown, the one that should have the longest fatigue life is

(A)

(B)

(C)

(D)

Solution

Option (B)

Has the longest fatigue life in comparison to other options

In Option (a) no transition length is provided so, it has less fatigue strength