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 Stress and Strain Curve for Mild Steel Pic-1 shows a typical tensile test specimen of a mild steel on a universal testing machine. Its ends are gripped into universal testing machine. The length between two gripped portion is L 1      The load is applied gradually and at regular interval of loads extension is measured. After a certain Load, extension increases at faster rate. the extension is measured from scale on the universal testing machine. load is increased gradually till the specimen breaks. Pic 3 shows stress vs strain diagram for the typical mild steel specimen. The following salient points are observed on stress strain curve. 1.   Limit of Proportionality (A) : it is the limiting value of the stress up to which stress is proportional to strain. 2. Elastic Limit: This is the limiting value of stress up to which if the material is stressed and then released(unloaded) strain disappears completely and the original length is regained. This point is sligh...

  Difference between Stress and Strain When a material is put under pressure or has a load applied to it, it develops stress and strain. When a solid is put under pressure, it has the ability to deform. The stress is the pressure per unit area of the material, and the resulting strain is the deformation that occurs as a result of this stress. Strain and stress are strongly intertwined because strain occurs solely as a result of stress. What is stress? When some external system of forces or loads act on a body, then a internal forces is produced to resist the external forces. This internal resistance  force per unit area at any cross-section is known as unit stress or stress. Stress is denoted by                 Stress,                                W...