Show simple item record

dc.contributor.authorCui, Fan
dc.date.accessioned2021-12-20T20:34:24Z
dc.date.available2021-12-20T20:34:24Z
dc.date.issued2021-08
dc.identifier.otherCui_cornell_0058O_11263
dc.identifier.otherhttp://dissertations.umi.com/cornell:11263
dc.identifier.urihttps://hdl.handle.net/1813/110391
dc.description91 pages
dc.description.abstractThe effect of drying on the constitutive behavior of a dual cross-linked poly(vinyl alcohol) (PVA) hydrogel is studied. This gel contains about 90% water when fully hydrated. The mass-volume relationship of the gel is measured using a microbalance with a density kit. Our results show that as the gel dries the volume is linearly proportional to the mass. The impact of drying on the gel’s mechanical properties is measured in uniaxial tension tests, which include loading-unloading tests at three different constant stretch rates, a complex loading history test and a stress-relaxation test. Data from specimens with different hydration levels can be described by a constitutive model of the gel. The results show that the model parameters are strongly dependent on hydration level and that as the gels dry, the gels become much stiffer than in the fully hydrated state. Fracture tests, including constant rate loading test and creep test, are also done for this hydrogel at different hydration levels. The results show that the breaking stress is much larger as the gels dry. Furthermore, experimental and numerical studies are done on the effect of compression in torsion-rheometry tests. The results show the compression will make us overestimate the dynamic modulus and give a shift factor for different compression.
dc.language.isoen
dc.subjectConstitutive response
dc.subjectFracture tests
dc.subjectHydration
dc.subjectRheology tests
dc.subjectUniaxial tests
dc.subjectViscoelasticity
dc.titleEFFECT OF HYDRATION ON THE MECHANICAL PROPERTIES OF A PVA DUAL-CROSSLINKED HYDROGEL
dc.typedissertation or thesis
thesis.degree.disciplineMechanical Engineering
thesis.degree.grantorCornell University
thesis.degree.levelMaster of Science
thesis.degree.nameM.S., Mechanical Engineering
dc.contributor.chairZehnder, Alan Taylor
dc.contributor.committeeMemberHui, Chung Yuen
dcterms.licensehttps://hdl.handle.net/1813/59810
dc.identifier.doihttps://doi.org/10.7298/ehee-1111


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record

Statistics