血管低温保存全过程的热应力分析

Analysis of Thermal Stresses Around the Whole Process of Artery Cryopreservation

计算机模拟了横观各向同性血管模型在低温保存全过程中的热应力分布 .结果表明 ,血管在复温刚开始阶段 ,血管外表面处出现一个显著的大应力峰 ,此时血管为理想线弹性体 ,容易导致沿截面的脆断 .而在降温阶段 ,血管虽然也出现大的应力峰 ,但此时血管为粘弹性体 ,并不一定会发生断裂 .

Thermal stresses around the whole process of artery cryopreservation were analyzed by means of computer simulation. The results indicate that in freezing stage many microcracks would appear but would not bring on fractures, and severe fractures often form at the early stages of thawing, at which time a very high stress appears on the artery surface. These results could clarify many experimental phenomena in artery cryopreservation.