STRAIN ENERGY
When a body is in a state of stress loaded externally deformation takes place a simple tensile member tends to elongate and a compressive member shortens the ratio of change in length to the original length is called strain since strain is a ratio of two lengths it is a dimensionless quantity. Thus the tensile or compressive strain is given by Strain = change in length/original length e = δl/l Shear strain: Consider a block is rigidly fixed to a vertical surface and force ‘p’ acts along its top fact tangentially to the top face under the action of shear force the block. Shear strain Φ = BB’/AB = x/y Since ‘x’ will be small therefore Φ is expressed in radians thus the measure of shear strain is the rotation of the planes perpendicular to the applied shear load. Volumetric strain: Consider each face of a cube is subjected to equal co...