正常国人肾动脉粘弹性实验研究

目的　对正常国人新鲜尸体肾动脉进行应力松弛 ,蠕变实验研究 ,为临床提供生物力学参数。方法　对肾动脉进行拉伸应力松弛、蠕变粘弹性力学性质进行实验研究。结果　得出了肾动脉的应力松弛 ,蠕变数据和曲线。用回归分析的方法处理实验数据 ,得出了归一化应力松弛函数和归一化蠕变函数。结论　肾动脉 72 0 0s松弛量为0 .2 80MPa ,72 0 0s蠕变量为 13.98%。应力松弛和蠕变在最初 6 0 0s变化较大 ,72 0 0s时应力松弛、蠕变曲线基本达到平衡。肾动脉为生物粘弹性固体材料

Experiment Study on the Viscoelastic Properties of Renal Artery in Healthy Chinese

Objective To provide clinical reference data on the stress-relaxation and creep- viscoelastic properties of renal arteries from fresh and healthy human cadavers. Method stress-relaxation and creep- viscoelastic tests were conducted for the renal arteries. Results The stress-relaxation and creep data were obtained. By regression analysis, the characteristics of the normalized stress-relaxation and the normalized creep behavior were established. Conclusion There was a big variation in the relaxation and creep behavior during the first 600 seconds of the testing. At 7200 seconds, the stress-relaxation and creep curve reached the equilibrium. At the time of 7200 seconds the measures of relaxation was 0.280 MPa and that of creep was 13.98%. These results suggested that the renal arteries belonged to solid biological materials characterized with viscoelastic properties.