TORSION

Lecture

Torsion is a type of deformation in which only a torque M kr occurs in a cross section of a shaft, and all other internal force factors are zero.

Equilibrium equation:

Deformation - shear angle (Fig. 3.2)

Voltage

- polar moment of inertia;

D is the diameter of the rod of circular cross section,

- shear stresses, p • distance from the point where it is determined TORSION

to the center of the shaft.

Element twist angle

- modulus of elasticity of the second kind

Rod twist angle

The stress state is pure shear (Fig. 3.1).

Fig. 3.1

Fig. 3.2

Strength Condition:

For fragile materials:

For plastic materials:

Stiffness condition:

- permissible twisting angle.

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