explain stress strain and curve
Answers
Answer:
Stress Strain Curve
✍ It is the graphical representation of stress versus strain .
\Large \text{Explaination\: For\: Stress\: Strain\: Curve }Explaination For Stress Strain Curve
✍ Explaination For Stress - Strain Curve refer the above Attached File .
✍ when the stress is zero strain is also zero .
✍ When the stress is gradually increased, strain also increases linearly up to a certain point (A) called proportional limit.
✍ Therefore, in the region OA Hool's law is obeyed with in this region the body regains its original state on removal of stress .
✍ Beyond A , the strain increases rapidly upto B. The region AB the strain is permanent on removal of stress .
✍ Then the wire is said to be acquired 'permanent set' . Therefore, in the region AB hooks law is not obeyed .
✍ Beyond B the material exhibits elastic behaviour. i.e in the region BC the material continues to elongate even for small increase in stress . Therefore in the region BC Hooke's law is not obeyed .
✍ If the material is wire, beyond C the wire elongates even if the longitudinal stress is not applied. Finally the wire breaks at the point D called breaking point of the wire
Answer:
Stress strain curve is the plot of stress and strain of a material or metal on the graph. In this the stress is plotted on y- axis and its corresponding strain on the x-axis. After plotting the stress and its corresponding strain on the graph, we get a curve, and this curve is called stress strain curve or stress strain diagram. The stress strain curve for different material is different. It may vary due to the temperature and loading condition of the material.
How to Draw Stress Strain Curve or Diagram
A tensile test is done on the material for the drawing the stress strain curve. A specimen of specific dimension is taken generally a circular rod. A tensile test is than conducted on this rod by the use of tensile testing machine.
In this test, the specimen is fixed at one ends and tensile load is applied on the other end. The value of load and the extension in the rod is noted down. As we have noted down the load and extension, the stress and the corresponding strain can be easily calculated.
The formula that is used for the calculation of stress and strain are
Stress and Strain Formula
Where,
σ = stress
P = Load
e = strain
dL = extension produced in the rod
L = original length
A = cross section area