Stress Strain Curve for Mild Steel ~ Civil Engineering Study

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Stress Strain Curve for Mild Steel

OA is Proportionality limit • OB is Elastic limit but OB is Non linear • The slippage of the carbon atom within a molecular mass leads to drop down of stress marginally from C to C’ • C is upper yield point • C’ is lower yield point (also known as Yield Stress f y ) • For exp Fe-250 => f y =250N/mm 2 • C’D is constant stress region called Yield Plateau DE is Strain Hardening region, material starts offering resistance against deformation • EF is Necking region where drop down of stresses occur upto Failure point • Necking region exists only in ductile material • In mild steel, ABC are closer to each other, therefore it is known as Linear Elastic Metal, and Yield stress and elastic stress is taken as 250N/mm 2 • The Fracture or Failure in mild steel depends upon Percentage of carbon present in a steel The strain at yield stress is about 0.00125 or 0.125% • CD represents plastic Yielding i.e. it is the strain which occurs after the yield point with no increase in stress • The strain at point D is about 0.015 or 1.5% • The strain in the range CD lies between 10 to 15 times the strain at yield point