Time dependent large principal deformation of polymers

N. P. O'Dowd, W. G. Knauss

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

A constitutive model which describes deformations of polymeric materials under small and large deformations is presented. It uses the kinetic theory of rubber elasticity as a starting point for the large deformation behavior and generalizes this theory to include the effect of rate dependence. The constitutive model reduces to (phenomenological) small strain linear viscoelasticity under vanishing strains, while at long times the response corresponds to that of a rubber-elastic material. The behavior of the model under constant strain rate, loading and unloading is examined in both the loading and unloading mode. As a result of appealing to physical/molecular concepts it provides naturally for simulation of a rate dependent yield phenomenon through intrinsic relaxation behavior without the specific introduction of a yield parameter or yield function. The effect of generalizing the rubber elasticity model to include compressibility is discussed. The investigation renders a material description, which, while possibly lacking in detail of species-specific behavior, reproduces major features of nonlinear and large deformation viscoelastic characteristics. These general features make the model suitable for investigating the influence of rate-dependent yielding and large deformation viscoelasticity in the solution of boundary value problems.

Original languageEnglish
Title of host publicationUse of Plastics and Plastic Composites
Subtitle of host publicationMaterials and Mechanics Issues
EditorsM. Ramulu, R. Komanduri
PublisherPubl by ASME
Pages77-95
Number of pages19
ISBN (Print)0791812529
Publication statusPublished - 1993
Externally publishedYes
EventProceedings of the 1993 ASME Winter Annual Meeting - New Orleans, LA, USA
Duration: 28 Nov 19933 Dec 1993

Publication series

NameAmerican Society of Mechanical Engineers, Materials Division (Publication) MD
Volume46

Conference

ConferenceProceedings of the 1993 ASME Winter Annual Meeting
CityNew Orleans, LA, USA
Period28/11/933/12/93

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