TABLE 1.
Appleχ |
Carrotχ |
Celeryτ |
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APdec | APctr | CAdec | CActr | CEdec | CEctr | |
Elastic modulus E [kPa] | 4.17 ± 0.17 | 4.36 ± 0.02 | 43.43 ± 5.22* | 83.48 ± 22.14* | 594.78 ± 94.24 | 552.49 ± 12.44 |
Stiffness K [kPa] | 4.33 ± 1.98* | 9.47 ± 1.85* | − | − | − | − |
Residual strain ε [%] | 6.42 ± 0.08 | 6.48 ± 0.01 | − | − | − | − |
Maximum stress [kPa] | 1.17 ± 0.28* | 2.07 ± 0.05* | 44.31 ± 8.59 | 51.49 ± 7.17 | 175.93 ± 40.96 | 174.60 ± 29.28 |
Hysteresis area H [J dm–3] | 0.112 ± 0.023 | 0.153 ± 0.003 | − | − | − | − |
Area under the curve A [J dm–3] | − | − | 11.1 ± 1.72 | 14.56 ± 2.30 | 15.37 ± 3.24 | 14.85 ± 1.75 |
Apple and carrot samples were tested by compression tests; celery samples were tested by tensile tests. n = 4, t-test: *p < 0.05. χCompression test; τtensile test.