Two type of tensile specimens are made from polystyrene (PS) and high impact polystyrene (HIPS). These specimens are tested for its tensile properties using universal testing machine. The stress vs strain graph of the specimens is displayed in Figure 1. By referring to Figure 1.

Compare the mechanical properties of both specimens.

40 40 30 Engineering Stress (MPa) 20 20 10 Polystyrene High impact Polystyrene 0 0.02 0.04 0.06 0.08 0.1 Engineering Strain (mm/mm)