modified 8-chain model

[magnus_harrysson_1978]

hi jorgen and everybody

when reading the 2000 mm paper by berstrom and boyce i noticed
that a modified version of the 8-chaim model was used. the modification
was used in order to allow for compressible materials. the modification is
not completely clear to be... i wounder, for instance, why the inverse langevin
function is present in the denominator??
can somebody perhaps help me with my issue??


best regards
magnus

[Jorgen]

I used that modification in order to introduce the shear modulus (mu) as a material parameter. The original paper used slightly different material parameters.

I recommend that you check out my Ph.D. thesis (http://www.polymerfem.com/forums/showthread.php?t=9) for more details.

-Jorgen