Yield point vs elastic limit 572207-Relation between yield point and elastic limit
In general, the elastic limit is an illdefined stress, but for impure iron and lowcarbon steels the onset of plastic deformation is denoted by a sudden drop in load indicating both an upper and lower yield point 1 This yielding behaviour is characteristic of many metals, particularly those with bcc structure containing small amounts of'B' is known as the yield point or the Elastic limit as the material's elasticity terminates at this point and it shows plastic deformation thereafter 3 Yielding Region (BC) As we have discussed point 'B' is known as the yield point and the stress value at 'B' is known as the yield stressUpper yield point is the maximum load the material requires to initiate plastic deformation Upto this point the dislocations don't need to move but as they cross the point 'B' the elastic limit ends and the dislocations move easing the stress required to cause further strain But again, a lower yield point is present below, and the g...