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Comparison between the proposed method and stretching equipment.
| Reference strain (%) | Measured strain (%) | Relative error (%) |
|---|---|---|
| 5 | 4.95 ± 0.59 | 1.00 |
| 10 | 9.97 ± 0.52 | 0.30 |
| 15 | 15.0 ± 0.58 | 0.00 |
| 20 | 19.9 ± 0.67 | 0.50 |
| 25 | 24.9 ± 0.73 | 0.40 |
| 30 | 29.8 ± 0.78 | 0.67 |
| 35 | 34.6 ± 0.85 | 1.14 |
| 40 | 39.3 ± 1.13 | 1.75 |
