During material testing, stress is applied from time $t_{i}$ to $t_{f}$ as shown below:
The corresponding strain responses for three different materials are shown in plots $\mathbf{P}, \mathbf{Q}$ and $\mathbf{R}$.
Choose the option(s) where the strain response is correctly mapped to its material class.
- $\text{P}$- purely elastic; $\text{Q}$- purely viscous; $\text{R}$- viscoelastic
- $\text{P}$- purely elastic; $\text{Q}$- viscoelastic; $\text{R}$- purely viscous
- $\text{P}$- purely viscous; $\text{Q}$- purely elastic; $\text{R}$- viscoelastic
- $\text{P}$- purely viscous; $\text{Q}$- viscoelastic; $\text{R}$- purely elastic
