Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jmps.2007.06.008
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dc.titleRate effects on toughness in elastic nonlinear viscous solids
dc.contributor.authorTang, S.
dc.contributor.authorGuo, T.F.
dc.contributor.authorCheng, L.
dc.date.accessioned2014-10-07T09:53:30Z
dc.date.available2014-10-07T09:53:30Z
dc.date.issued2008-03
dc.identifier.citationTang, S., Guo, T.F., Cheng, L. (2008-03). Rate effects on toughness in elastic nonlinear viscous solids. Journal of the Mechanics and Physics of Solids 56 (3) : 974-992. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jmps.2007.06.008
dc.identifier.issn00225096
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/86675
dc.description.abstractA micromechanics-based constitutive relation for void growth in a nonlinear viscous solid is proposed to study rate effects on fracture toughness. This relation is incorporated into a microporous strip of cell elements embedded in a computational model for crack growth. The microporous strip is surrounded by an elastic nonlinear viscous solid referred to as the background material. Under steady-state crack growth, two dissipative processes contribute to the macroscopic fracture toughness-the work of separation in the strip of cell elements and energy dissipation by inelastic deformation in the background material. As the crack velocity increases, voids grow in the strain-rate strengthened microporous strip, thereby elevating the work of separation. In contrast, the energy dissipation in the background material decreases as the crack velocity increases. In the regime where the work of separation dominates energy dissipation, toughness increases with crack velocity. In the regime where energy dissipation is dominant, toughness decreases with crack velocity. Computational simulations show that the two regimes can exist in certain range of crack velocities for a given material. The existence of these regimes is greatly influenced by the rate dependence of the void growth mechanism (and the initial void size) as well as that of the bulk material. This competition between the two dissipative processes produces a U-shaped toughness-crack velocity curve. Our computational simulations predict trends that agree with fracture toughness vs. crack velocity data reported in several experimental studies for glassy polymers and rubber-modified epoxies. © 2007 Elsevier Ltd. All rights reserved.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1016/j.jmps.2007.06.008
dc.sourceScopus
dc.subjectFracture mechanisms
dc.subjectPolymeric material
dc.subjectPorous material
dc.subjectRate dependence
dc.subjectViscoelasticity
dc.typeArticle
dc.contributor.departmentMATERIALS SCIENCE AND ENGINEERING
dc.contributor.departmentMECHANICAL ENGINEERING
dc.description.doi10.1016/j.jmps.2007.06.008
dc.description.sourcetitleJournal of the Mechanics and Physics of Solids
dc.description.volume56
dc.description.issue3
dc.description.page974-992
dc.description.codenJMPSA
dc.identifier.isiut000254268900013
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