Discussion
A plot of strain (%) versus time of a polymer is given below. Based on this plot and the properties as mentioned below, find out the correct combination.
1 = Viscoelastic deformation; 2 = Elastic deformation
3 = Viscoelastic recovery; 4 = Elastic recovery
Answer: D
The match is P-2; Q-1; R-4; S-3.
The plot is a creep and recovery test on a viscoelastic polymer. When the load is applied, strain jumps at once from O to A: this instant part P is elastic deformation. Under constant load the strain then keeps rising with time from A to B: the time-dependent part Q is viscoelastic deformation.
When the load is removed at B, the strain drops at once from B to C: this instant part R is elastic recovery, equal in size to P. The strain then decreases slowly from C to D: S is viscoelastic recovery. The strain at D does not return to zero, which is the permanent (viscous) flow.
The other options swap instant and time-dependent parts, for example calling the vertical jump P viscoelastic.
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