Development of a Macroscopic Yield Function for Polymeric Foams
Date Published: 2004-03-08
Paper Number:2004-01-0465
DOI: 10.4271/2004-01-0465
Citation:
Wang, D. and Pan, J., "Development of a Macroscopic Yield Function for Polymeric Foams," SAE Technical Paper 2004-01-0465, 2004, doi:10.4271/2004-01-0465.
A macroscopic yield function is proposed here to characterize a polymeric foam under a full range of loading conditions. The principal stresses of a stress tensor and the second invariant of the deviatoric stress tensor are the main parameters in the yield function. The yield function is expressed in terms of a linear combination of non-quadratic functions of the relative principal stresses and the second invariant of the deviatoric stress tensor. The non-quadratic yield function can be used to describe the yield behavior of a polymeric foam in Deshpande and Fleck [
1
] under a full range of loading conditions. A comparison of different macroscopic yield functions to describe the yield behavior of the foam is also presented.
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