STRENGTH OF MATERIALS

Stresses

TENSION

TORSION

My - torsion moment <p - angle of torsion

Stress is load or force acting per unit area and is usually expressed in kilogrammes per square millimetre or Pa (Паскаль).

Strain is the distortion (деформация) in a material due to stress. Stresses are of three main types:

Sensile - forces acting m such a direction as to increase the lengu. Coi^pressive - forces acting in such a direction as to decrease the leflgth. Shear ' the effect of two forces acting in opposite directions and along parallel lines. The forces act in such a direction so as to cause the various parts of a section to slide one on the other. Stress is proportional to the distance from neutral axis passes through. centroid of the section.

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