The shaft can now be considered in three parts:

(i) A solid elastic core of 14.1 mm external radius;

(ii) A fully plastic cylindrical region between r = 14.1 mm and r — 23 mm;

(iii) An elastic outer cylinder of external diameter 50 mm and thickness 2 mm.

Torque on elastic core r£ R

Torque on plastic section

Torque on elastic outer case

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