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Question
At the room-temperature stress (σ) - strain(€) curves of four materials P, Q, R, and S are shown in the figure below. The material that behaves as a rigid perfectly plastic material is
A.
P
B.
Q
C.
R
D.
S
Answer ( Option D)

S

Solution

Perfectly Plastic Material: 
For this type of material, there will be only initial stress required and then the material will flow under constant stress. 
The chart shows the relation between stress-strain in different materials.

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