TABLE 3.
Comparison between fracture toughness results obtained from the EC and NDR techniques
| Elastic Unloading Compliance |
Normalization Data Reduction |
|||||||
|---|---|---|---|---|---|---|---|---|
| Notch Type | S/N | Specimen ID | JQ (kN/m) | TM,JQ (MPa) | TM,mean (MPa) | JQ (kN/m) | TM,JQ (MPa) | TM,mean (MPa) |
| FPC | N | A | 130.25 | 21.85 | 13.92 | 125.86 | 25.15 | 16.30 |
| B | 122.82 | 27.99 | 18.44 | 107.15 | 34.19 | 23.78 | ||
| C | 112.23 | 15.67 | 9.75 | … | … | … | ||
| Average | 121.77 | 21.84 | 14.04 | 116.50 | 29.67 | 20.04 | ||
| SD | 9.06 | 6.16 | 4.34 | 13.23 | 6.39 | 5.29 | ||
| S | A | 149.50 | 26.98 | 17.47 | 121.68 | 32.20 | 21.74 | |
| B | 133.75 | 22.01 | 14.02 | 170.34 | 20.35 | 12.82 | ||
| C | 149.99 | 26.03 | 16.79 | 201.30 | 28.50 | 18.41 | ||
| Average | 144.41 | 25.00 | 16.09 | 164.44 | 27.02 | 17.65 | ||
| SD | 9.23 | 2.64 | 1.83 | 40.14 | 6.06 | 4.51 | ||
| SN | N | A | 205.07 | 20.02 | 12.60 | … | … | … |
| B | 162.96 | 23.22 | 14.78 | 155.08 | 34.56 | 23.08 | ||
| C | 184.19 | 23.73 | 15.10 | 138.73 | 33.87 | 22.76 | ||
| Average | 184.07 | 22.32 | 14.16 | 146.91 | 34.21 | 22.92 | ||
| SD | 21.05 | 2.01 | 1.36 | 11.56 | 0.48 | 0.23 | ||
| S | A | 97.04 | 18.04 | 11.44 | 66.13 | 22.81 | 15.67 | |
| B | 184.21 | 23.28 | 14.80 | 137.48 | 31.33 | 20.80 | ||
| C | 189.91 | 21.49 | 13.58 | 145.49 | 30.43 | 20.04 | ||
| Average | 157.05 | 20.94 | 13.27 | 116.37 | 28.19 | 18.84 | ||
| SD | 52.05 | 2.66 | 1.70 | 43.69 | 4.68 | 2.77 | ||
Note: N = nonsupported; S = supported; SD = standard deviation.