Table 2.
Estimated prestrains and residual stresses of the epicardial layer on the unpressurized intact heart. Prestrains (ɛX, ɛY) for each anatomical location were estimated by comparing stress-free marker dimensions (dissected epicardial layer) and in situ marker dimensions (epicardial layer on the unpressurized intact heart). Note: Stress-free marker dimensions were used as reference to calculate the prestrains. The residual stresses (σX(residual), σY(residual)) for each anatomical location were predicted by prestrains (ɛX and ɛY) using the adjusted biaxial stress–strain curves (figure 5).
| N = 5 | ɛX | σX(residual) (kPa) | ɛY | σY(residual) (kPa) |
|---|---|---|---|---|
| basal anterior (B1) | −0.30 ± 4.25% | 0 | 8.59 ± 3.62% | 2.39 |
| basal lateral (B2) | 4.66 ± 0.44% | 8.95 | 6.75 ± 1.85% | 3.05 |
| basal posterior (B3) | 3.01 ± 4.58% | 4.68 | 7.72 ± 4.38% | 4.48 |
| middle anterior (M1) | −3.51 ± 3.07% | 0 | 8.72 ± 6.70% | 4.29 |
| middle lateral (M2) | 7.09 ± 3.43% | 12.09 | 10.70 ± 1.36% | 7.88 |
| middle posterior (M3) | 5.50 ± 3.10% | 2.89 | 8.31 ± 4.55% | 2.06 |
| apex | 4.89 ± 1.72% | 12.24 | 8.84 ± 3.37% | 3.89 |