There are certain behaviours of all materials under the influence of external force. Stress and strain are one of the measures to show these behaviours. Stress is a resistive force per unit area, which is developed internally to oppose the external force subjected to the material. Strain is a measure of deformation of the material per unit dimensions. If the stress developed in the material is perpendicular to cross-section, it is known as direct stress and if it is tangential or parallel to cross-section, it is known as shear stress.
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