Klinich Kathleen D, Miller Carl S, Hu Jingwen, Nazmi Giseli M, Pearlman Mark D, Schneider Lawrence W, Rupp Jonathan D
Transportation Research Institute, University of Michigan, Ann Arbor, MI 48109, USA.
J Biomech Eng. 2012 Mar;134(3):034501. doi: 10.1115/1.4006025.
Dynamic mechanical properties of placenta tissue are needed to develop computational models of pregnant occupants for use in designing restraint systems that protect the fetus and mother. Tests were performed on 21 samples obtained from five human placentas at a rate of 1200 %/s using a set of custom designed thermoelectrically cooled clamps. Approximately half of the samples from all five subjects were tested within 48 h of delivery. The remaining samples were frozen for 5-7 days and then thawed before testing. True failure stresses and strains were not significantly different between fresh and frozen samples (p-value = 0.858 and 0.551, respectively), suggesting that soft tissue may be stored frozen up to a week without adversely affecting dynamic material response.
为了开发用于设计保护胎儿和母亲的约束系统的孕妇计算模型，需要了解胎盘组织的动态力学特性。使用一组定制设计的热电冷却夹具，以1200%/秒的速率对从五个人类胎盘中获取的21个样本进行了测试。来自所有五个受试者的样本中，约一半在分娩后48小时内进行了测试。其余样本冷冻5 - 7天，然后在测试前解冻。新鲜样本和冷冻样本之间的真实破坏应力和应变没有显著差异（p值分别为0.858和0.551），这表明软组织可以冷冻保存长达一周，而不会对动态材料响应产生不利影响。
