$6-53.$ An A$-36$ steel strip has an allowable bending stress of $165$ MPa $.$ If it is rolled up$,$ determine the smallest radius $r$ of the spool if the strip has a width of $10$ mm and a thickness of $1\mathrm{.}5$ mm $.$ Also, find the corresponding maximum internal moment developed in the strip.

$322$

CHAPTER $6$ BENDING

$6-54.$ If the beam is subjected to an internal moment of $M=30kN*m,$ determine the maximum bending stress in the beam. The beam is made from A$992$ steel. Sketch the bending stress distribution on the cross section.

$6-55.$ If the beam is subjected to an internal moment of $M=30kN*m,$ determine the resultant force caused by the bending stress distribution acting on the top flange $A.$