Explanation of Stress Strain Curve

Stress strain curve has different regions and points. These regions and points are:

(i).  Proportional limit

(ii).  Elastic limit

(iii). Yield point

(iv). Ultimate stress point

(v).  Fracture or breaking point.

(i). Proportional Limit: It is the region in the strain curve which obeys hookes law i.e. within elastic limit the stress is directly proportion to the strain produced in the material. In this limit the ratio of stress with strain gives us proportionality constant known as young’s modulus. The point OA in the graph is called the proportional limit.

(ii). Elastic Limit: It is the point in the graph upto which the material returns to its original position when the load acting on it is completely removed. Beyond this limit the material cannot return to its original position and a plastic deformation starts to appear in it. The point A is the Elastic limit in the graph.

(iii). Yield Point or Yield Stress Point: Yield point in a stress strain diagram is defined as the point at which the material starts to deform plastically. After the yield point is passed there is permanent deformation develops in the material and which is not reversible. There are two yield points and it is upper yield point and lower yield point. The stress corresponding to the yield point is called yield point stress. The point B is the upper yield stress point and C is the lower yield stress point.

(iv) Ultimate Stress Point: It is the point corresponding to the maximum stress that a material can handle before failure. It is the maximum strength point of the material that can handle the maximum load. Beyond this point the failure takes place. Point D in the graph is the ultimate stress point.

(v). Fracture or Breaking Point: It is the point in the stress strain curve at which the failure of the material takes place. The fracture or breaking of material takes place at this point. The point e is the breaking point in the graph.

DATA PROVIDED BY MRINMOY SAHA

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Explanation Of Stress Strain Curve PDF