TORSION 2 Internal torque and its diagram 1) Internal torque: The moment of internal forces acting in arbitrary section of the member in torsion designated by t 2) Determine the internal torque by the method of section ∑ m=0,T-m2=0 T -n X 3)Sign conventions for internal torque Twill be considered to be positive when the relation between its turning direction and the out normal line obeys the right hand rule, otherwise it will be considered to be negative.13 3) Sign conventions for internal torque： “T”will be considered to be positive when the relation between its turning direction and the out normal line obeys the right hand rule, otherwise it will be considered to be negative. 2、Internal torque and its diagram 1) Internal torque：The moment of internal forces acting in arbitrary section of the member in torsion. Designated by“T”. 2) Determine the internal torque by the method of section: m m m T T m m T m x    0,   0 x