另一方面,带有动脉瘤的血管受到S形应力-应变曲线的影响。作为视觉辅助,动脉瘤可以理解为长的圆柱形球囊。因为它是在压力下的紧密气球,所以只要施加超过特定力阈值的压力,它就会随时弹出。同样,不健康的血管具有弹性不稳定性,会导致破裂。最初,对于给定的半径和压力,材料的刚度线性增加。在某一点,动脉壁的刚度会随着载荷的增加而降低。在较高的应变值下,曲线下的面积会增加,从而增加了对材料的影响,从而促进了裂纹的扩展。动脉瘤血管和健康血管的机械性能的差异源于血管的组成差异。与正常主动脉相比,动脉瘤主动脉的胶原蛋白和研磨物质的体积分数要高得多(54.8%对95.6%),弹性蛋白的体积分数要低得多(22.7%对2.4%)和平滑肌(22.6%对22.6%)。 2.2%),这有助于提高初始刚度。还发现,动脉瘤血管壁的极限拉伸强度或承受断裂的强度比正常主动脉的极限拉伸强度低50%。还发现破裂的动脉瘤主动脉壁的壁强度为54.2N / cm 2,远低于修复的主动脉壁的82.3N / cm 2。由于动脉壁组成的变化,总的来说动脉瘤具有较低的抗破裂强度。由于硬化血管会表现出区域各向异性,因此难以预测破裂的风险,这意味着应力和强度值会根据血管沿着其测量的区域和方向而变化。
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