Preconditioning does not reset the strain history of uniaxially tested, porcine aortic valve tissues

摘要

We therefore conclude that the "memory' of a stress relaxation process cannot be reset by a preconditioning cycle. Unlike the load/elongation strain history that can be reset by preconditioning, the memory of a stress relaxation test is retainedbeyond a preconditioning sequence. Moreover, the pattern of stress relaxation curve evolution suggests that some absolute amount of holding time must accumulate before subsequent stress relaxation curves are identical. When we performed short stressrelaxation tests, we needed to run through many more of them before relaxation curves were identical. It is therefore likely that the type of internal fiber reconformation that occurs during a stress relaxation test is different from the type that occursduring preconditioning.