The point that identifies the proportional limit of the material whose graph of stress as a function of strain is shown is
A) 1
B) 2
C) 3
D) 4
E) 5

Question

The point that identifies the proportional limit of the material whose graph of stress as a function of strain is shown is
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Quizplus · Accepted Answer

The proportional limit is the point where stress is proportionate to strain without any permanent deformation after the stress is removed. From the graph, we can see that point 2 represents the proportional limit as the stress and strain are linearly proportional until this point. After point 2, the material undergoes plastic deformation and does not fully return to its original shape after the stress is removed.

The Point That Identifies the Proportional Limit of the Material