A circular shaft with a keyway can be approximated by the section shown in the following figure.

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A circular shaft with a keyway can be approximated by the section shown in the following figure. The keyway is represented by the boundary equation r = b, while the shaft has the boundary relation r = 2a cos θ. Using the technique of Section 9.4, a trial stress function is suggested of the form:

4 = K (b  1) ( 2a cos 0 r

where K is a constant to be determined. Show that this form will solve the problem and determine the constant K. Compute the two shear stress components τ,xz andτ,yz.

r= b y r 8 r = 2acos 8 X

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