From the stress???strain data for poly (methyl methacrylate) shown in Figure, determine the modulus of elasticity and tensile strength at room temperature [20°C (68°F)], and compare these values with those given in Table15.1.

12 80 4C (40F) 70 10 60 20C (68F) 30C (86F) 50 40 40C (104F) 30 50C (122F) 20 To 1.30 60C (140F) 10 0.1 0.2 0.3 Strain Yield Strength [MPa (ksi)| Tensile Modulus Tensile Strength [MPa (ksi)] Elongation at Break (%) Specific Gravity Material IGP (ksi)] Polyethylene (low density) 0.917-0.932 0.17-0.28 8.3-31.4 9.0-14.5 100-650 (1.2-4.55) (25-41) (1.3-2.1) Pol ethylene (high density) 22.1-31.0 (3.2-4.5) 0.952-0.965 1.06-1.09 26.2-33.1 10-1200 (155158) (3.8-4.8) Pol (vinyl chloride) 1.30-1.58 2.4-4.1 40.7-51.7 40.7-44.8 40-80 (5.9-6.5) (350-600) (5.9-7.5) Pol tetrafluoroethylene 2.14-2.20 0.40-0.55 20.7-34.5 200-400 (58-80) (3.0-5.0) Pol propylene 31.0-37.2 (4.5-5.4). 0.90-0.91 1.14-1.55 31-41.4 100-600 (165-225) (4.5-6.0) 1.04-1.05 Polystyrene 2.28-3.28 35.9-51.7 12-2.5 (330-475) (5.2-7.5) Pol (methyl methacrylate) 1.17-1.20 2.24-3.24 48.3-72.4 53.8-73.1 2.0-5.5 (7.0-10.5) (325-470) (7.8-10.6) 1.24-1.32 Phenol-formaldehyde 2.76-4.83 34.5-62.1 1.5-2.0 (400-700) (5.0-9.0) Nylon 6,6 1.13-1.15 1.58-3.80 75.9-94.5 (11.0-13.7) 44.8-82.8 15-300 (230-550) (6.5-12) Polyester (PET) 1.29-1.40 2.8-4.1 48.3-72.4 59.3 30-300 (400-600) (7.0-10.5) (8.6) 2.38 Polycarbonate 1.20 62.8-72.4 62.1 110-150 (345) (9.1-10.5) (9.0) Stress (MPa) 2. Stress (10 psi)