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Required information

Problem $06\mathrm{.}012-$ A solid round bar has a groove with a radius machined into it

A $1\mathrm{.}100-$in$-$diameter solid round bar has a groove $0\mathrm{.}1-$in deep with a $0\mathrm{.}100-$in radius machined into it$.$ The bar is made of AISI $1020$ CD steel and is subjected to a purely reversing torque of $1700lbf*in.$

Problem $06\mathrm{.}012.$f $-$ Estimate the number of cycles to failure

Estimate the number of cycles to failure. $($Round the final answer to three decimal places.$)$

The number of cycles to failure is

${10}^6$