Stress: the internal resistance offered by a body per unit area against deformation is known as stress.
* the units of stress depending upon the unit of load and unit of area.
* unit of stress is Newton per metre square.
Types of stresses
The various types stresses may be classified as:
(A) simple or direct stress
1 tension stress
2 compressive stress
3 shear stress
(B) indirect stress
1 bending
2 torsion
(C) combined stress
Any possible combination of type 1and2
1 tensile stress: the stresses induced in a body when subjected to 2 equal and opposite pulls, as a result of which there is an increasing in length is known as tensile stress.
2 compressive stress: the stress induced in a body, when subjected to two equal and opposite pushes as a result of which there is a decreasing in length of the body is known as compressive stress.
3 shear stress: the stress induced in a body, when subjected to two equal and opposite forces which are acting tangentially across the resisting section, as a result of which the body tends to shear off across the section is known as shear stress.
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