Aortic dissection occurs predominantly in the thoracic aorta and the mechanisms for the initiation and propagation of the tear in aortic dissection are not well understood. We study the tearing characteristics of the porcine thoracic aorta using a peeling test and we estimate the peeling energy per unit area in the ascending and the descending segments. The stretch and the peel force per unit width undergone by the peeled halves of a rectangular specimen are measured. We find that there can be significant variation in the stretch within the specimen and the stretch between the markers in the specimen varies with the dynamics of peeling. We found that in our experiment the stretch achieved in the peeled halves was such that it was in the range of the stretch at which the stress–stretch curve for the uniaxial experiment starts deviating from linearity. Higher peeling energy per unit area is required in the ascending aorta compared to the descending aorta. Longitudinal specimens required higher peeling energy per unit area when compared to the circumferential specimens.

主动脉夹层主要发生在胸主动脉中，并且对于主动脉夹层中泪液的形成和传播的机制尚不清楚。我们使用剥离试验研究了猪胸主动脉的撕裂特性，并估计了上升段和下降段中单位面积的剥离能量。测量矩形样品的两半剥离后的每单位宽度的拉伸和剥离力。我们发现，样品中的拉伸强度可能会发生显着变化，并且样品中标记之间的拉伸强度会随剥离动力学而变化。我们发现，在我们的实验中，去皮的两半所达到的拉伸程度处于该拉伸范围内，在该范围内，单轴实验的应力-拉伸曲线开始偏离线性。与降主动脉相比，升主动脉需要更高的单位面积剥离能量。与圆周试样相比，纵向试样每单位面积需要更高的剥离能量。